Complete through: 108 (5.14): "Internal Affairs"
Last updated: 2008-Apr-28
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Travis Aaron | Lt. Mark Schilz [uncr] | Guest Starring | 1.05:The Curse |
| Tim Abell | Jack D. Curtin | Guest Starring | 1.18:UnSEALed |
| Phil Abrams | Hotel Manager | Co-Starring | 1.10:Left for Dead |
| Mark Adair-Rios | Iggy Mejia | Guest Starring | 2.17:An Eye For An Eye |
| John L. Adams | EMT Seth Patterson | Guest Starring | 3.16:Family Secret |
| Jonathan Adams | Thomas Zuri | Guest Starring | 5.08:Designated Target |
| Dayo Ade | ER Orderly | Guest Starring | 4.24:Angel of Death |
| Seth Adkins | Sean Hodges | Guest Starring | 3.19:Iced |
| Michael Adler | Navy Capt. Burger | Guest Starring | 1.01:Yankee White |
| Mesrop Agajanyan | Henri Rousseau | Co-Starring | 5.01:Bury Your Dead |
| Nikita Ager | Shannon O'Hara | Guest Starring | 5.04:Identity Crisis |
| Nynno Ahli | Rick Green | Guest Starring | 4.20:Cover Story |
| Chris Akers | Johnny Smokerson | Co-Starring | 4.20:Cover Story |
| Kevin Alejandro | Jaime Jones | Guest Starring | 4.11:Driven |
| Alex S. Alexander | Sara Turcott | {co-starring} | 2.06:Terminal Leave |
| Sasha Alexander | Special Agent Caitlin Todd | Starring | 1.01:Yankee White - 2.23:Twilight |
| Special Agent Caitlin Todd, RIP | Special Guest Stars | 3.01:Kill Ari (Part I) | |
| Special Guest Stars | 3.02:Kill Ari (Part II) | ||
| Crystal Allen | Laura | Co-Starring | 1.09:Marine Down |
| Todd Allen | Park Ranger James Landis | Guest Starring | 3.17:Ravenous |
| Tyrees Allen | Guest Starring | 3.24:Hiatus (Part II) | |
| Christopher Allport | Metro Police Cpt. Dan Karzin | Guest Starring | 3.10:Probie |
| Corbin Allread | Corpsman Milano | Guest Starring | 1.06:High Seas |
| Brooks Almy | _ | Guest Starring | 1.04:The Immortals |
| Laz Alonso | SSgt. Steven Washington | Guest Starring | 1.21:Split Decision |
| Aris Alvarado | Tomas Zepeda | Guest Starring | 3.19:Iced |
| Walid Amini | Marine Lance Corp. Abdul Bakr | Co-Starring | 5.11:Tribes |
| Bibi Amos | Receptionist | Co-Starring | 2.22:SWAK |
| Mini Anden | Hannah Bressling | Guest Starring | 3.11:Model Behavior |
| Erich Anderson | CIA Agent Jack Canton | Guest Starring | 1.09:Marine Down |
| Nathan Anderson | Luke Walters | Guest Starring | 2.18:Bikini Wax |
| Rico Anderson | Rick Samson | Co-Starring | 4.10:Smoked |
| Vincent Angell | Bruce Webb | Guest Starring | 2.21:Hometown Hero |
| Philip Anthony-Rodriguez | Former Marine LCPL Lloyd Jackson | Guest Starring | 4.17:Skeletons |
| Cas Anvar | Masoud Tariq | Guest Starring | 4.12:Suspicion |
| Robert Arbogast | FBI Special Agent Wentworth | Co-Starring | 5.14:Internal Affairs |
| Michael Archer | Sales Person #1 | Co-Starring | 2.12:Doppelgänger |
| Anthony Armatrading | William N'Diaye | Guest Starring | 3.12:Boxed In |
| John Asher | Fred Rinnert | Guest Starring | 5.03:Ex-File |
| Armand Assante | La Grenouille | Special Guest Star | 4.14:Blowback |
| Special Guest Star | 4.23:Trojan Horse | ||
| Special Guest Star | 4.24:Angel of Death | ||
| Special Guest Star | 5.01:Bury Your Dead | ||
| Matthew Atherton | Captain Starling | Co-Starring | 2.05:The Bone Yard |
| Kimberly Atkinson | NCIS Special Agent Roberta Wells | Co-Starring | 5.05:Leap of Faith |
| Scott Atkinson | Lt. Cmdr. Kyle Ross | Guest Starring | 3.15:Head Case |
| Richard Augustine | Janitor | Co-Starring | 1.19:Dead Man Talking |
| Sherman Augustus | Marine Cpt. Daniel Lemay | Guest Starring | 2.20:Red Cell |
| Jeff Austin | _ | Guest Starring | 1.15:Enigma |
| Alex Avant | Clerk | Co-Starring | 1.06:High Seas |
| Erick Avari | _ | Guest Starring | 1.08:Minimum Security |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Robert Bagnell | Leonard Rish | Guest Starring | 1.01:Yankee White |
| Katherine Bailess | Madison | Guest Starring | 4.09:Twisted Sister |
| Julian Bailey | _ | Guest Starring | 1.04:The Immortals |
| Samantha Bailey | Little Angel | Co-Starring | 4.24:Angel of Death |
| Colin Bain | Engign Ray | Co-Starring | 1.04:The Immortals |
| Robert Baker | Seaman | Guest Starring | 1.06:High Seas |
| Ron Baker | Major Craig Peary | Co-Starring | 1.09:Marine Down |
| Adam Baldwin | Cmdr. Rainer | Guest Starring | 1.22:A Weak Link |
| Reginald Ballard | Antwane Mann | Guest Starring | 1.17:The Truth Is Out There |
| Brandon Barash | Ex-Petty Office Derrick Paulson | Guest Starring | 4.02:Escaped |
| Tim Barraco | Service Technician | Co-Starring | 2.21:Hometown Hero |
| David Barrera | Charlie Milla | Guest Starring | 4.13:Sharif Returns |
| Lynsey Bartilson | Ruby Rae | Guest Starring | 4.12:Suspicion |
| Bonnie Bartlett | Doctor | Guest Starring | 1.12:My Other Left Foot |
| Erinn Bartlett | Madeline Torrance | Guest Starring | 4.17:Skeletons |
| Blake Bashoff | Josh Cooper | Guest Starring | 4.07:Sandblast |
| Emma Bates | _ | Guest Starring | 2.18:Bikini Wax |
| David Batiste | Max Phillips | Guest Starring | 4.14:Blowback |
| Matt Battaglia | P.O. Porcaro | Guest Starring | 1.22:A Weak Link |
| John Beasley | Daryl Hardy | Guest Starring | 4.12:Suspicion |
| Mike Beaver | Larry West | Guest Starring | 4.03:Singled Out |
| Gerry Becker | Secret Service Agent William Baer | Guest Starring | 1.01:Yankee White |
| Owen Beckman | Nicholas Barnes | Guest Starring | 5.02:Family |
| Michael Bellisario | Charles "Chip" Sterling | Guest Starring | 3.06:The Voyeur's Web |
| Guest Starring | 3.07:Honor Code | ||
| Guest Starring | 3.08:Under Covers | ||
| Guest Starring | 3.09:Frame Up | ||
| Troian Bellisario | Sarah | Co-Starring | 2.20:Red Cell |
| Sarah {uncr} | Guest Starring | 3.16:Family Secret | |
| Sarah McGee | Guest Starring | 4.09:Twisted Sister | |
| Vivienne Bellisario | Mysterious Redhead {uncr} | Guest Starring | 1.01:Yankee White |
| Guest Starring | 1.03:Seadog | ||
| Guest Starring | 1.09:Marine Down | ||
| Guest Starring | 1.18:UnSEALed | ||
| Guest Starring | 2.08:Heart Break | ||
| Guest Starring | 3.04:Silver War | ||
| Robert Patrick Benedict | Aaron Alan Wright | Guest Starring | 2.12:Doppelgänger |
| Elizabeth Bennett | Carla Johnson | Guest Starring | 3.09:Frame Up |
| John Eric Bentley | Capt. Arthur Caldwell | Guest Starring | 3.06:The Voyeur's Web |
| Julie Benz | Mrs. Denise Johnson | Guest Starring | 1.22:A Weak Link |
| John Berg | General Grant | Guest Starring | 3.04:Silver War |
| Maria Bertrand | Young Woman | Co-Starring | 3.05:Switch |
| Wil Bethel | P.O. John Kirby | Guest Starring | 3.05:Switch |
| Joseph Bey | Nasser Al Jazair | Co-Starring | 1.08:Minimum Security |
| Ankur Bhatt | Salman Umar | Co-Starring | 4.19:Grace Period |
| John Billingsley | Jackson Scott | Guest Starring | 4.22:In The Dark |
| Bill Birch | State Trooper Dan Lynch | Co-Starring | 1.05:The Curse |
| Lilli Birdsell | Jill Reynolds | Guest Starring | 5.03:Ex-File |
| Peter Birkenhead | Elroy Webster | Guest Starring | 4.21:Brothers in Arms |
| James Black | unknown | Guest Starring | 1.07:Sub Rosa |
| Robert Blanche | Brett Willis | Guest Starring | 3.04:Silver War |
| Rob Boltin | Marine Captain Rod Newell | Guest Starring | 2.03:Vanished |
| Victor Bonavida | Zack | Co-Starring | 1.09:Marine Down |
| Rachel Boston | Siri Albert | Guest Starring | 4.05:Dead and Unburied |
| Sara Botsford | Dr. Helen Berkley | Guest Starring | 4.21:Brothers in Arms |
| Timothy Bottoms | Ritt Everett | Guest Starring | 2.03:Vanished |
| JR Bourne | Det. Marshall Collins | Guest Starring | 5.09:Lost & Found |
| Tom Bower | Sheriff Miller Thompson | Guest Starring | 2.03:Vanished |
| Lauren Bowles | Mary | Guest Starring | 1.05:The Curse |
| Rebecca Boyd | _ | Guest Starring | 1.09:Marine Down |
| Katy Boyer | Guest Starring | 1.11:Eye Spy | |
| Terry Bozeman | Navy Cmdr. Doug Jakobsen | Guest Starring | 4.22:In The Dark |
| Derrex Brady | Navy Corpsman | Guest Starring | 2.08:Heart Break |
| Steven Brand | Ian Hitch | Guest Starring | 2.16:Pop Life |
| Betsy Brandt | P.O. Barbara Swain | Guest Starring | 2.02:The Good Wives Club |
| Jeremy Brandt | Corpsman | Co-Starring | 3.16:Family Secret |
| Brigid Brannagh | Catherine Reynolds | Guest Starring | 2.19:Conspiracy Theory |
| David Brant [real NCIS Director] | NCIS Special Agent David Brant | And | 3.09:Frame Up |
| Steve Braun | Landon Grey | Guest Starring | 4.20:Cover Story |
| Wendy Braun | Cindy Sanchez | Guest Starring | 3.11:Model Behavior |
| Abigail Breslin | Sandy Watson | Guest Starring | 2.01:See No Evil |
| Steve Bridges | George W. Bush | Guest Starring | 1.01:Yankee White |
| Ivar Brogger | Simon Katz | Guest Starring | 3.15:Head Case |
| Jayne Brook | Lyndi Crawshaw | Guest Starring | 4.20:Cover Story |
| Emerson Brooks | Navy Lieutenant Carl Greer | Co-Starring | 5.04:Identity Crisis |
| Jason Brooks | Maj. Danny O'Donnell | Guest Starring | 1.09:Marine Down |
| Richard Brooks | _ | Guest Starring | 1.09:Marine Down |
| Benjamin Brown | Marine Capt. Arvidas | Guest Starring | 3.19:Iced |
| Billy Brown | Chief Petty Officer Velat | Guest Starring | 2.08:Heart Break |
| Billy Aaron Brown | Man in Mask/Donny Potter | Guest Starring | 2.20:Red Cell |
| Caleb Brown | Petty Officer | Co-Starring | 3.15:Head Case |
| Dorian Brown | FBI Special Agent Courtney Krieger | Guest Starring | 5.04:Identity Crisis |
| Rob Brownstein | Wayne Gordon | Guest Starring | 4.13:Sharif Returns |
| Roxana Brusso | Noemi Cruz | Guest Starring | 4.24:Angel of Death |
| Tara Buck | P.O. Debra Marshall | Guest Starring | 2.02:The Good Wives Club |
| Susse Budde | Laura Osgood | Guest Starring | 3.07:Honor Code |
| Burt Bulos | Abog Galib | Guest Starring | 3.23:Hiatus (Part I) |
| Guest Starring | 3.24:Hiatus (Part II) | ||
| Sean Thomas Bunch | Marine Major John Maguire | Co-Starring | 4.13:Sharif Returns |
| Michael Reilly Burke | Frank Connell | Guest Starring | 3.07:Honor Code |
| Will Burke | Det. Todd Miller | Guest Starring | 2.12:Doppelgänger |
| Olivia Burnette | Sarah Lowell | Guest Starring | 2.22:SWAK |
| Matt Bushell | Marine Lt. Rob King | Guest Starring | 2.21:Hometown Hero |
| P.J. Byrne | Ross Logan | Guest Starring | 3.13:Deception |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| John Cabrera | Officer Samuel Tate | Guest Starring | 4.09:Twisted Sister |
| J.R. Cacia | Metro Police Detective John Carson | Guest Starring | 4.15:Friends & Lovers |
| Debbie Campbell | Mary Elizabeth Donahue | Guest Starring | 4.15:Friends & Lovers |
| Karis Campbell | Navy Lt. Elaine Taylor | Guest Starring | 5.09:Lost & Found |
| Scott Michael Campbell | Robert Miller | Guest Starring | 4.06:Witch Hunt |
| Michael Canaan | MP | Co-Starring | 2.02:The Good Wives Club |
| Andrew Caple-Shaw | P.O. Jerry Smith | Guest Starring | 3.05:Switch |
| Amy Carlson | Karen Sutherland | Guest Starring | 5.10:Corporal Punishment |
| Matt Carmody | Lt. J.G. Chaplain Brian Evans | Guest Starring | 2.02:The Good Wives Club |
| Willie C. Carpenter | Arthur Gruden | Guest Starring | 2.12:Doppelgänger |
| Rocky Carroll | NCIS Asst. Director Leon Vance | Guest Starring | 5.14:Internal Affairs |
| Jade Carter | Marine Capt. Daniel Wise | Guest Starring | 3.18:Bait |
| Joseph Castanon | Zach Tanner | Guest Starring | 3.07:Honor Code |
| Larry Cedar | Jason Mitchell | Guest Starring | 2.18:Bikini Wax |
| Esther K. Chae | Yoon Dawson | Guest Starring | 3.14:Light Sleeper |
| Dean Chekvala | Frank Holtz | Guest Starring | 4.15:Friends & Lovers |
| Jason Christopher | Motorcycle Rider | Co-Starring | 2.10:Chained |
| Robert Cicchini | Agent Daniel Snyder | Guest Starring | 1.16:Bête Noire |
| Guest Starring | 1.23:Reveille | ||
| Enzo Cilenti | Mamoun Sharif | Guest Starring | 4.07:Sandblast |
| Guest Starring | 4.13:Sharif Returns | ||
| Larry Clark | Director | Guest Starring | 3.04:Silver War |
| Kendall Clement | Foreman | Co-Starring | 2.02:The Good Wives Club |
| Dennis Cockrum | _ | Guest Starring | 2.23:Twilight |
| Claire Coffee | Nikki Crawshaw | Guest Starring | 4.03:Singled Out |
| Assaf Cohen | Eli Lissack (aka Goliath) | Guest Starring | 4.14:Blowback |
| Laurence Cohen | Scott {uncr} | Guest Starring | 1.21:Split Decision |
| Candice Coke | Det. Danielle Hamilton | Guest Starring | 5.09:Lost & Found |
| Shelly Cole | Bernadette Watkins | Guest Starring | 4.24:Angel of Death |
| Misha Collins | Justin Farris | Guest Starring | 4.03:Singled Out |
| Mercedes Colón | _ | Guest Starring | 1.11:Eye Spy |
| Eddie Conna | Metro Police Sergeant Frank Thompson | Co-Starring | 5.05:Leap of Faith |
| Elizabeth Connors | Kathy Webb | Guest Starring | 2.21:Hometown Hero |
| Shane Conrad | Navy Lt. Dean Westfall | Guest Starring | 2.23:Twilight |
| Alicia Coppola | Lt. Cmdr. Faith Coleman, JAG | Guest Starring | 1.18:UnSEALed |
| Guest Starring | 2.07:Call of Silence | ||
| Guest Starring | 2.21:Hometown Hero | ||
| Matt Corboy | PO Lance Tolliver | Guest Starring | 5.13:Dog Tags |
| Annie Corley | Deputy Secretary of State Anna Elliot | Guest Starring | 2.10:Chained |
| Celestin Cornielle | Marine Coporal Keener | Co-Starring | 4.23:Trojan Horse |
| David Andriole Corrigan | _ | Guest Starring | 1.04:The Immortals |
| Robert Costanzo | Jimmy Napalitano | Guest Starring | 2.05:The Bone Yard |
| Brant Cotton | Militia Member {uncr} | Guest Starring | 1.21:Split Decision |
| Brian Cousins | Jacob Torrance | Guest Starring | 4.17:Skeletons |
| Gregory Crane | ERT Member | Co-Starring | 3.21:Bloodbath |
| Daz Crawford | Matt Barrows | Co-Starring | 4.15:Friends & Lovers |
| Jarrod Crawford | Marine M.P. Sgt. Brooks | Guest Starring | 3.09:Frame Up |
| Richard Anthony Crenna | Chief Steward | Co-Starring | 1.01:Yankee White |
| Roger Cross | Lt. Cmdr. David Warfield | Guest Starring | 5.13:Dog Tags |
| Wilson Cruz | Todd Ryder | Guest Starring | 4.20:Cover Story |
| Brett Cullen | Captain Todd Gelfand | Guest Starring | 3.23:Hiatus (Part I) |
| Guest Starring | 3.24:Hiatus (Part II) | ||
| Steven Culp | Navy Cmdr. William Skinner | Guest Starring | 5.06:Chimera |
| Ryan Culver | Navy Lt. Curtis Janssen | Co-Starring | 2.23:Twilight |
| Sondra Currie | Lillian Hencheck | Guest Starring | 3.21:Bloodbath |
| Jon Curry | Deputy Tyler Barrett | Guest Starring | 4.12:Suspicion |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Alan Dale | N.C.I.S. Director Tom Morrow | Guest Starring | 1.01:Yankee White |
| Guest Starring | 1.03:Seadog | ||
| Guest Starring | 1.09:Marine Down | ||
| Guest Starring | 1.15:Enigma | ||
| Guest Starring | 1.16:Bête Noire | ||
| Guest Starring | 2.23:Twilight | ||
| Guest Starring | 3.01:Kill Ari (Part I) | ||
| Merle Dandridge | Marcy Carruthers | Guest Starring | 1.03:Seadog |
| Eli Danker | Mossad Officer Michael Bashan | Guest Starring | 4.01:Shalom |
| Josh Daugherty | Devon Kane | Guest Starring | 2.09:Forced Entry |
| Brandon Davis | Jimmy | Also Starring | 1.02:Hung Out to Dry |
| Don S. Davis | MTAC Control Officer | Guest Starring | 2.10:Chained |
| Josie Davis | Marta | Guest Starring | 1.23:Reveille |
| Adria Dawn | NCIS Tech | Co-Starring | 3.20:Untouchable |
| Sandra Frasier | Co-Starring | 5.12:Stakeout | |
| Derek de Lint | Dr. Stephen Bauer | Guest Starring | 1.10:Left for Dead |
| Cote de Pablo | Officer Ziva David, Mossad | Guest Starring | 3.01:Kill Ari (Part I) |
| Guest Starring | 3.02:Kill Ari (Part II) | ||
| Officer Ziva David, Mossad Liaison | Starring | 3.04:Silver War - 5.14:Internal Affairs | |
| Emilie de Ravin | Nancy | Guest Starring | 1.03:Seadog |
| Matt Decaro | Chief Daryl Bello | Guest Starring | 2.20:Red Cell |
| Blue Deckert | Policeman Randall ? | Guest Starring | 2.05:The Bone Yard |
| Matthew del Negro | Balboa? | Guest Starring | 1.16:Bête Noire |
| Diane Delano | Dee Dee Chesney | Guest Starring | 4.16:Dead Man Walking |
| Yvonne Delarosa | _ | Guest Starring | 1.04:The Immortals |
| Marieh Delfino | Judy Moore | Guest Starring | 2.15:Caught on Tape |
| Howard Dell | Gym Manager | Co-Starring | 1.11:Eye Spy |
| Marie Dellegrazie | Ashley Simmons | Co-Starring | 2.20:Red Cell |
| Pancho Demmings | Gerald Jackson | Guest Starring | 1.01:Yankee White |
| Also Starring | 1.02:Hung Out to Dry | ||
| Guest Starring | 1.03:Seadog | ||
| Guest Starring | 1.06:High Seas | ||
| Guest Starring | 1.07:Sub Rosa | ||
| Guest Starring | 1.08:Minimum Security | ||
| Guest Starring | 1.09:Marine Down | ||
| Guest Starring | 1.10:Left for Dead | ||
| Guest Starring | 1.11:Eye Spy | ||
| Guest Starring | 1.13:One Shot, One Kill | ||
| Guest Starring | 1.14:The Good Samaritan | ||
| Guest Starring | 1.15:Enigma | ||
| Guest Starring | 1.16:Bête Noire | ||
| Guest Starring | 3.01:Kill Ari (Part I) | ||
| Guest Starring | 3.02:Kill Ari (Part II) | ||
| Michael Dempsey | Coach Morgan | Guest Starring | 2.08:Heart Break |
| Mark Derwin | Marine Major Bradley Raines | Guest Starring | 4.12:Suspicion |
| Seamus Dever | Graham Thomas | Guest Starring | 4.03:Singled Out |
| Dayna Devon | Attractive Girl | Co-Starring | 1.20:Missing |
| Tim Dezarn | David Runion | Guest Starring | 2.15:Caught on Tape |
| Keith Diamond | Sgt. Gregory Nutt | Also Starring | 1.02:Hung Out to Dry |
| Eddie Diaz | Petty Officer Gomer | Co-Starring | 1.06:High Seas |
| Brian Dietzen | Jimmy Palmer, Asst. M.E. | Guest Starring | 1.21:Split Decision |
| Guest Starring | 1.22:A Weak Link | ||
| Guest Starring | 1.23:Reveille | ||
| Guest Starring | 2.01:See No Evil | ||
| Guest Starring | 2.02:The Good Wives Club | ||
| Guest Starring | 2.04:Lt. Jane Doe | ||
| Guest Starring | 2.05:The Bone Yard | ||
| Guest Starring | 2.06:Terminal Leave | ||
| Guest Starring | 2.08:Heart Break | ||
| Guest Starring | 2.09:Forced Entry | ||
| Guest Starring | 2.11:Black Water | ||
| Guest Starring | 2.13:The Meat Puzzle | ||
| Guest Starring | 2.14:Witness | ||
| Guest Starring | 2.15:Caught on Tape | ||
| Guest Starring | 2.16:Pop Life | ||
| Guest Starring | 2.17:An Eye For An Eye | ||
| Guest Starring | 2.18:Bikini Wax | ||
| Guest Starring | 2.19:Conspiracy Theory | ||
| Guest Starring | 2.20:Red Cell | ||
| Guest Starring | 2.21:Hometown Hero | ||
| Guest Starring | 2.22:SWAK | ||
| Guest Starring | 2.23:Twilight | ||
| Guest Starring | 3.04:Silver War | ||
| Guest Starring | 3.05:Switch | ||
| Guest Starring | 3.06:The Voyeur's Web | ||
| Guest Starring | 3.08:Under Covers | ||
| Guest Starring | 3.09:Frame Up | ||
| Guest Starring | 3.10:Probie | ||
| Guest Starring | 3.11:Model Behavior | ||
| Guest Starring | 3.14:Light Sleeper | ||
| Guest Starring | 3.15:Head Case | ||
| Guest Starring | 3.16:Family Secret | ||
| Guest Starring | 3.17:Ravenous | ||
| Guest Starring | 3.19:Iced | ||
| Guest Starring | 3.20:Untouchable | ||
| Guest Starring | 3.21:Bloodbath | ||
| Guest Starring | 3.22:Jeopardy | ||
| Guest Starring | 3.23:Hiatus (Part I) | ||
| Guest Starring | 3.24:Hiatus (Part II) | ||
| Guest Starring | 4.01:Shalom | ||
| Guest Starring | 4.02:Escaped | ||
| Guest Starring | 4.05:Dead and Unburied | ||
| Guest Starring | 4.06:Witch Hunt | ||
| Guest Starring | 4.08:Once A Hero | ||
| Guest Starring | 4.10:Smoked | ||
| Guest Starring | 4.11:Driven | ||
| Guest Starring | 4.15:Friends & Lovers | ||
| Guest Starring | 4.16:Dead Man Walking | ||
| Guest Starring | 4.17:Skeletons | ||
| Guest Starring | 4.22:In The Dark | ||
| Guest Starring | 4.24:Angel of Death | ||
| Guest Starring | 5.01:Bury Your Dead | ||
| Guest Starring | 5.04:Identity Crisis | ||
| Guest Starring | 5.05:Leap of Faith | ||
| Guest Starring | 5.09:Lost & Found | ||
| Guest Starring | 5.11:Tribes | ||
| Guest Starring | 5.12:Stakeout | ||
| Guest Starring | 5.13:Dog Tags | ||
| Susan Diol | Dr. Leslie Burke | Guest Starring | 4.06:Witch Hunt |
| Heidi Dippold | Laura Seeger | Guest Starring | 1.14:The Good Samaritan |
| Dar Dixon | Army Captain [Tom] Bradstone | Co-Starring | 1.03:Seadog |
| Alex Dodd | Qassam? | Guest Starring | 1.16:Bête Noire |
| John Doman | Police LT. Cheney | Guest Starring | 2.12:Doppelgänger |
| Chad Donella | John Briggs | Guest Starring | 3.03:Mind Games |
| Elisa Donovan | Rebecca Kemp | Guest Starring | 4.05:Dead and Unburied |
| Chad Doreck | Leo | Co-Starring | 1.13:One Shot, One Kill |
| Homie Doroodian | Seth Shakir | Guest Starring | 1.03:Seadog |
| Curt Doussett | Federal Marshal | Co-Starring | 2.05:The Bone Yard |
| Gerald Downey | Navy Cmdr. Ray Trapp | Guest Starring | 1.01:Yankee White |
| Jonathan Wade Drahos | Lt. Greg Pallini | Co-Starring | 1.05:The Curse |
| Archie Drury | Rod Spain | Co-Starring | 1.18:UnSEALed |
| Conor Dubin | Jeremy Pryor | Guest Starring | 2.14:Witness |
| Charles Duckworth | Joe Bennes | Guest Starring | 3.18:Bait |
| Shaun Duke | Azid Abu Selom | Guest Starring | 4.19:Grace Period |
| Jennifer Dundas | Lynn Simons | Guest Starring | 2.19:Conspiracy Theory |
| Robin Dunne | Army Lt. Joseph Marsden | Guest Starring | 5.03:Ex-File |
| Charles Durning | Ernie Yost | Special Guest Star | 2.07:Call of Silence |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Dave Earnest | Marine SSgt. Erik Niles | Co-Starring | 4.06:Witch Hunt |
| Margaret Easley | Sara Nelson | Guest Starring | 5.02:Family |
| Steven Eckholdt | Navy Cmdr. Dr. Brad Pitt | Guest Starring | 2.22:SWAK |
| Stacy Edwards | Commander Janice Byers, M.D. | Guest Starring | 2.08:Heart Break |
| Zac Efron | Danny | Guest Starring | 3.13:Deception |
| Joe Egender | Robert Graves | Guest Starring | 5.04:Identity Crisis |
| Gretchen Egolf | Det. Andrea Sparr | Guest Starring | 5.12:Stakeout |
| Helen Eigenberg | Lt. Cmdr. Amanda Wilkerson, USN | Guest Starring | 3.13:Deception |
| Judyann Elder | Marny Mathers | Guest Starring | 4.02:Escaped |
| Steven Elder | Nick Taylor | Guest Starring | 4.18:Iceman |
| Chris Ellis | Gunnery Sgt. John Deluca | Guest Starring | 2.05:The Bone Yard |
| Kiko Ellsworth | Williw Taylor | Guest Starring | 2.16:Pop Life |
| Corri English | Lisa Delgado | Guest Starring | 4.15:Friends & Lovers |
| Kaj-Erik Eriksen | Frank Smith | Guest Starring | 2.20:Red Cell |
| Mike Erwin | Devon Watkins | Guest Starring | 4.24:Angel of Death |
| Michael Esparaza | Marine Lance Corporal Jose Silva | Guest Starring | 3.19:Iced |
| Al Espinoza | Tom Verne | Guest Starring | 1.10:Left for Dead |
| Mark Damon Espinoza | Sheriff Deke Lester | Guest Starring | 2.11:Black Water |
| Cody Estes | Kevin Curtin | Co-Starring | 1.18:UnSEALed |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Patrick Fabian | Ray Vincent | Guest Starring | 5.10:Corporal Punishment |
| Kent Faulcon | Cmdr. Reynolds | Guest Starring | 2.04:Lt. Jane Doe |
| Nat Faxon | Carter Finch | Guest Starring | 3.06:The Voyeur's Web |
| Ariel Felix | Alon Atu | Co-Starring | 3.23:Hiatus (Part I) |
| Sherilyn Fenn | Jane Doe, aka Suzanne McNeil | Guest Starring | 1.10:Left for Dead |
| Chelsea Field | Jocelyn Wayne | Guest Starring | 3.15:Head Case |
| David Dayan Fisher | Trent Kort | Guest Starring | 4.10:Smoked |
| Guest Starring | 4.11:Driven | ||
| Guest Starring | 4.14:Blowback | ||
| Guest Starring | 4.21:Brothers in Arms | ||
| Guest Starring | 4.23:Trojan Horse | ||
| Guest Starring | 4.24:Angel of Death | ||
| Guest Starring | 5.01:Bury Your Dead | ||
| Guest Starring | 5.14:Internal Affairs | ||
| Brian Thomas Fitzpatrick | Willis Hirst | Co-Starring | 3.07:Honor Code |
| Randy Flagler | Gibbs' C.O | Co-Starring | 3.23:Hiatus (Part I) |
| Jonathan T. Floyd | PO2 Gil Niles | Guest Starring | 1.06:High Seas |
| Robert Floyd | Police Officer | Co-Starring | 1.20:Missing |
| Nina Foch | Mrs. Vanessa Mallard | Guest Starring | 2.13:The Meat Puzzle |
| Mrs. Victoria Mallard | Guest Starring | 3.20:Untouchable | |
| Shang Forbes | DJ | Guest Starring | 2.16:Pop Life |
| VJ Foster | Arkady Kobach | Guest Starring | 4.04:Faking It |
| David Frabrizio | Marine Col. Frederick Cooper | Guest Starring | 4.07:Sandblast |
| Don Franklin | FBI Agent Ron Sacks | Guest Starring | 3.09:Frame Up |
| Guest Starring | 4.01:Shalom | ||
| Guest Starring | 4.10:Smoked | ||
| Roshawn Franklin | Crew Chief Rogers | Co-Starring | 5.06:Chimera |
| Jonathan Fraser | Secret Service Officer Jack Lyon | Guest Starring | 3.20:Untouchable |
| Sheila E. Frazier | Female Reporter | Co-Starring | 1.13:One Shot, One Kill |
| ZNN Reporter Debra Green | Co-Starring | 1.23:Reveille | |
| Co-Starring | 4.01:Shalom | ||
| Heath Freeman | _ | Guest Starring | 1.08:Minimum Security |
| Bruce French | Floyd Vernon | Guest Starring | 3.15:Head Case |
| Alex Frost | Jerry | Co-Starring | 3.17:Ravenous |
| Amanda Fuller | Jennifer Shields | Guest Starring | 2.06:Terminal Leave |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Courtney Gains | Gary Silverstin | Guest Starring | 4.02:Escaped |
| Mo Gallini | Andre Jones | Guest Starring | 4.21:Brothers in Arms |
| Lee Garlington | Mary Hanlan | Guest Starring | 2.13:The Meat Puzzle |
| Jeremy Garrett | Marine Captain Patrick Barnett | Guest Starring | 2.03:Vanished |
| Spencer Garrett | Commander Spencer | Guest Starring | 2.02:The Good Wives Club |
| Grant Garrison | P.O. Wilson | Guest Starring | 2.12:Doppelgänger |
| Michael Gaston | Maj. Dougherty | Guest Starring | 1.13:One Shot, One Kill |
| Jennifer Gatti | Negotiator Arkin | Guest Starring | 1.16:Bête Noire |
| Craig Gellis | Civilian Crewman #1 | Co-Starring | 5.06:Chimera |
| Brian George | Dr. Ameen Temani | Guest Starring | 4.23:Trojan Horse |
| Jarvis George | Navy Lt. Morgan Tolliver | Guest Starring | 3.23:Hiatus (Part I) |
| Guest Starring | 3.24:Hiatus (Part II) | ||
| Ross Gibby | P.O. Vengal | Guest Starring | 1.22:A Weak Link |
| Chris Payne Gilbert | Wesley Rowan | Guest Starring | 3.17:Ravenous |
| Michael Gilden | Marty Pearson | Guest Starring | 4.08:Once A Hero |
| Guest Starring | 4.10:Smoked | ||
| Peter Giles | Torsten Engler | Guest Starring | 4.11:Driven |
| Bruno Gioiello | Air Boss | Co-Starring | 1.06:High Seas |
| Mary Pat Gleason | Nurse Wells | Guest Starring | 2.05:The Bone Yard |
| Linsey Godfrey | Stephanie Phillips | Guest Starring | 3.18:Bait |
| Michael Goetz | Bartender | Co-Starring | 1.20:Missing |
| Jesse D. Goins | Jeffrey Wilson | Guest Starring | 2.13:The Meat Puzzle |
| Carlos Gomez | CPO Reyes | Guest Starring | 1.06:High Seas |
| Fidel Gomez | Jordan Block | Guest Starring | 4.09:Twisted Sister |
| Julie Gonzalo | Sarah Schaefer | Also Starring | 1.02:Hung Out to Dry |
| Cameron Goodman | Maddie Tyler | Guest Starring | 5.07:Requiem |
| Randy J. Goodwin | Defense Lawyer | Guest Starring | 1.18:UnSEALed |
| Kathryn Gordon | Young Pregnant Woman | Co-Starring | 1.22:A Weak Link |
| Bruce Gray | _ | Guest Starring | 1.11:Eye Spy |
| Michael Graziadei | Chuck | Guest Starring | 1.21:Split Decision |
| Joel Gretsch | NCIS Special Agent Stan Burley | Guest Starring | 1.06:High Seas |
| Cole Griffin | Marine Corporal Jackson | Co-Starring | 1.20:Missing |
| Mark Griffin | Blue McGinty | Co-Starring | 2.16:Pop Life |
| Tim Griffin | Marine Sgt. Malcolm Porter | Guest Starring | 3.14:Light Sleeper |
| Lt. Col. Douglas Griffith | Himself | {co-starring} | 2.07:Call of Silence |
| Brian Gross | PO Colin Dixon | Guest Starring | 5.13:Dog Tags |
| Demetrius Grosse | Atif Nukunda | Co-Starring | 5.08:Designated Target |
| Gary Grubbs | Coroner Elmo Poke | Guest Starring | 1.01:Yankee White |
| Michael Guarnera | Vic Gera | Co-Starring | 2.05:The Bone Yard |
| Nicholas Guilak | Bassam | Guest Starring | 1.23:Reveille |
| Ben Guillory | Henry | {co-starring} | 2.07:Call of Silence |
| Jacory Gums | NCIS Agent Jim Nelson | Guest Starring | 4.19:Grace Period |
| Jeremy Guskin | Roland Kesta | Guest Starring | 2.12:Doppelgänger |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Molly Hagan | Audrey Vetter | Guest Starring | 2.19:Conspiracy Theory |
| Daniel Hagen | Calvin Hopper | Guest Starring | 4.03:Singled Out |
| Stacy Haiduk | Half-Sister | Guest Starring | 1.12:My Other Left Foot |
| Jane Hajduk | Attractive Woman | Co-Starring | 1.11:Eye Spy |
| Jennifer Hall | Daphne Everett | Guest Starring | 2.03:Vanished |
| Shashawnee Hall | Police Chief Whalen | Guest Starring | 2.21:Hometown Hero |
| Melora Hardin | ex-PO Erin Toner | Guest Starring | 1.05:The Curse |
| Mark Harelik | Ron Levinson | Guest Starring | 3.20:Untouchable |
| Mark Harmon | Special Agent Leroy Jethro Gibbs | Starring | 1.01:Yankee White - 5.14:Internal Affairs |
| Marcy Harriell | Nurse Carly Marcano | Guest Starring | 4.23:Trojan Horse |
| Guest Starring | 4.24:Angel of Death | ||
| Cristi Ellen Harris | Vicki Spain | Co-Starring | 1.18:UnSEALed |
| Marcuis W. Harris | Chris Jenkins | Guest Starring | 5.10:Corporal Punishment |
| Michelle Harrison | Park Ranger Bobby Hendricks | Guest Starring | 3.17:Ravenous |
| Mya Harrison | Jade King | Guest Starring | 2.16:Pop Life |
| Mariette Hartley | Hanna Lowell | Guest Starring | 2.22:SWAK |
| Brad Hawkins | Sgt. Aaron Barnes | Guest Starring | 1.13:One Shot, One Kill |
| David Haydn-Jones | Marine Capt. Jim Mills | Guest Starring | 5.11:Tribes |
| Jesse Head | Lyle Chamber | Guest Starring | 2.06:Terminal Leave |
| Anthony Heald | _ | Guest Starring | 2.17:An Eye For An Eye |
| Pat Healy | Jonathan Hanlan | Guest Starring | 2.13:The Meat Puzzle |
| Bill Heck | Cory Mitas | Guest Starring | 5.06:Chimera |
| Jesse Heiman | Frederick Pippin | Co-Starring | 2.20:Red Cell |
| Evan Helmuth | EMT Jeff Beilsman | Guest Starring | 3.16:Family Secret |
| Adam Hendershott | Josh | Guest Starring | 1.21:Split Decision |
| David Henrie | Willy Shields | Guest Starring | 2.06:Terminal Leave |
| Deidrie Henry | Tracy Taylor | Guest Starring | 4.11:Driven |
| Garette Henson | Cpl. Ernie Yost {young} | Guest Starring | 2.07:Call of Silence |
| Sandra Hess | Regine Smidt | Guest Starring | 4.10:Smoked |
| Guest Starring | 4.11:Driven | ||
| Guest Starring | 4.14:Blowback | ||
| Guest Starring | 4.23:Trojan Horse | ||
| Jennifer Hetrick | Dr. Donna Dunlap | Guest Starring | 5.11:Tribes |
| Chris Heuisler | Navy Seaman Joe Wilkins | Guest Starring | 2.04:Lt. Jane Doe |
| Torri Higginson | Dr. Jordan Hampton | Guest Starring | 5.04:Identity Crisis |
| Mieko Hillman | Jennifer Murphy | Co-Starring | 4.03:Singled Out |
| Tommy Hinkley | Disbursing Officer ? | Guest Starring | 1.05:The Curse |
| Kate Hodge | NCIS Special Agent Jane Melankovic | Guest Starring | 2.02:The Good Wives Club |
| Stephanie Hodge | Sheriff Charlene Dupray | Guest Starring | 1.14:The Good Samaritan |
| Charlie Hofheimer | PO1 Bobby Wilkes | Guest Starring | 1.06:High Seas |
| Hal Holbrook | Mickey Stokes | Guest Starring | 4.02:Escaped |
| Michael Holden | Dr. Wayne Dobson | Guest Starring | 3.16:Family Secret |
| Dierdre Holder | Woman | Co-Starring | 5.08:Designated Target |
| Ellen Hollman | NCIS Special Agent Tina Larsen | Co-Starring | 3.16:Family Secret |
| Josh Holloway | West Virginia State Police Officer | Guest Starring | 1.12:My Other Left Foot |
| Lauren Holly | N.C.I.S. Director Jenny Shepard | Guest Starring | 3.01:Kill Ari (Part I) |
| Guest Starring | 3.02:Kill Ari (Part II) | ||
| Guest Starring | 3.04:Silver War | ||
| Guest Starring | 3.06:The Voyeur's Web | ||
| Guest Starring | 3.07:Honor Code | ||
| Guest Starring | 3.08:Under Covers | ||
| Starring | 3.09:Frame Up - 5.14:Internal Affairs | ||
| Teck Holmes | Jamel Jones | Guest Starring | 2.18:Bikini Wax |
| Mark Holton | Sergeant Linn | Guest Starring | 1.03:Seadog |
| Hugh Holub | Superintendent | {co-starring} | 2.07:Call of Silence |
| Saba Homayoon | Faatin Amal | Guest Starring | 4.01:Shalom |
| Neil Hopkins | Jeremy Davison | Guest Starring | 2.09:Forced Entry |
| Hosea | Marine Lance Cpl. Jaime Ramos | Co-Starring | 2.21:Hometown Hero |
| Mat Hostetler | Mess Specialist | Co-Starring | 1.07:Sub Rosa |
| Brian Howe | Sherriff Tom Barrett | Guest Starring | 4.12:Suspicion |
| James Huang | PO Wong | Guest Starring | 1.17:The Truth Is Out There |
| Alaina Huffman | Dana Arnett | Guest Starring | 5.05:Leap of Faith |
| Tom R. Hughes | Lt. Rick Johnson, r.i.p. [uncr] | Guest Starring | 1.22:A Weak Link |
| Eamon Hunt | Chief Petty Officer Morris | Co-Starring | 1.04:The Immortals |
| Adam Huss | Navy Seal Lt. Michael Arnett | Guest Starring | 5.05:Leap of Faith |
| Harry Hutchinson | Alexandria Cop | Co-Starring | 1.17:The Truth Is Out There |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Eiji Inoue | Navy Lt. Cmdr. Satoshi Takada | Co-Starring | 5.06:Chimera |
| Matthew Iseman | DC Metro Officer Talbot | Co-Starring | 3.19:Iced |
| Ravil Isyanov | Nikolai Puchenko | Guest Starring | 4.04:Faking It |
| Gregory Itzin | FBI Director | Guest Starring | 1.01:Yankee White |
| Guest Starring | 1.03:Seadog | ||
| Gomez Warren IV | AV Tech | Co-Starring | 3.11:Model Behavior |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Nick Jaine | Jason Patel | Co-Starring | 1.19:Dead Man Talking |
| Janiece Jary | Woman | Co-Starring | 4.02:Escaped |
| Donnie Jeffcoat | Navy Seaman Tom Jennings | Guest Starring | 2.04:Lt. Jane Doe |
| Chase Ryan Jeffrey | Kyle Zolin | Guest Starring | 2.20:Red Cell |
| Eddie Jemison | Terry Spooner | Guest Starring | 3.21:Bloodbath |
| Gina St. John | Cindy Ames | Co-Starring | 2.11:Black Water |
| Anne-Marie Johnson | Marine Col. Stacey Radcliffe | Guest Starring | 5.07:Requiem |
| Chas. Floyd Johnson | AFIP Medical Examiner | Co-Starring | 2.05:The Bone Yard |
| Chris Johnson | PO James Morgan | Guest Starring | 1.17:The Truth Is Out There |
| Asante Jones | Homicide Detective Andy Kochofis | Co-Starring | 1.01:Yankee White |
| Guest Starring | 1.10:Left for Dead | ||
| Brian Jones | Uniformed Guard | Co-Starring | 5.13:Dog Tags |
| Burnadean Jones | Sally Smith | Guest Starring | 3.04:Silver War |
| Jamison Jones | {unknown} | Guest Starring | 3.23:Hiatus (Part I) |
| John Marshall Jones | Detective Hanley | Guest Starring | 1.19:Dead Man Talking |
| Robert Joseph | Lt. Cmdr. Folsom | Guest Starring | 1.22:A Weak Link |
| Sterling Macer Jr. | Marine Sgt. Chris Hegarty | Guest Starring | 2.09:Forced Entry |
| Anne Judson-Yager | Emmy Poole | Guest Starring | 2.21:Hometown Hero |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Tyler Kain | Tiffany | Guest Starring | 2.08:Heart Break |
| Matthew Kaminsky | Henry Spivey | Co-starring | 3.08:Under Covers |
| Aleksandra Kaniak | Russian Nurse | Co-Starring | 4.23:Trojan Horse |
| Jackie Kaptan | Dog Trainer | Co-Starring | 5.13:Dog Tags |
| Dominic Scott Kay | Carson Taylor | Guest Starring | 5.09:Lost & Found |
| Katie Amanda Keane | Laurie Niles | Guest Starring | 4.06:Witch Hunt |
| Jack Kehler | Middle-Aged Man | Guest Starring | 2.04:Lt. Jane Doe |
| David Keith | Capt. Mike Watson, USN | Guest Starring | 2.01:See No Evil |
| Richard Keith | Frank Dreyer | Guest Starring | 3.21:Bloodbath |
| Tim Kelleher | Agent Chris Pacci | Guest Starring | 1.16:Bête Noire |
| Guest Starring | 1.18:UnSEALed | ||
| Guest Starring | 1.19:Dead Man Talking | ||
| Mary Page Keller | Lt. Commander Michaela "Micki" Shields | Guest Starring | 2.06:Terminal Leave |
| James Martin Kelly | Mookie Perkins | Guest Starring | 3.12:Boxed In |
| Rick Kelly | Navy Capt | Guest Starring | 5.06:Chimera |
| Jerry Kernion | Scott Rowe | Co-Starring | 5.12:Stakeout |
| Tom Kiesche | Bob Whitehead | Guest Starring | 4.05:Dead and Unburied |
| Charles S. Kim | SRT Sniper | Co-Starring | 3.18:Bait |
| Rachel Kimsey | PO Erica Perelli | Guest Starring | 5.13:Dog Tags |
| Todd Kimsey | Police Captain Grant | Guest Starring | 2.03:Vanished |
| Cleo King | Della Robinson | Guest Starring | 2.17:An Eye For An Eye |
| Lloyd Kino | Hitoshi Yoshida | Guest Starring | 2.07:Call of Silence |
| Malik Kirkwood | Skateboard Kid #2 | Co-starring | 3.06:The Voyeur's Web |
| Scott Klace | Dr. Timothy Hass | Guest Starring | 4.16:Dead Man Walking |
| Chaney Kley | Cpl. Paul Brinkman | Also Starring | 1.02:Hung Out to Dry |
| Sima Kostov | Darya Borov | Guest Starring | 4.23:Trojan Horse |
| Gary Kraus | Chuck Parnell | Co-Starring | 3.13:Deception |
| Alexander Krosney | Nadia Harcourt | Guest Starring | 3.18:Bait |
| Michelle Krusiec | Maya | Guest Starring | 3.08:Under Covers |
| Daniella Kuhn | Saleswoman | Co-Starring | 1.10:Left for Dead |
| Mimi Kuzyk | Ginger Stevenson | Guest Starring | 3.21:Bloodbath |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Patrick Labyorteaux | Lt. Bud Roberts | Special Guest Star | 1.02:Hung Out to Dry |
| Carlos Lacamara | Joe Tabaraz | Guest Starring | 2.17:An Eye For An Eye |
| John Lacy | Park Ranger Kett | Guest Starring | 2.15:Caught on Tape |
| Eric Laden | PO Thompson | Guest Starring | 1.07:Sub Rosa |
| Sal Landi | Cmdr. Stovic | Guest Starring | 1.06:High Seas |
| Fredric Lane | Captain Graves, USS Enterprise | Guest Starring | 1.19:Dead Man Talking |
| Eric Lange | William Lafferty | Guest Starring | 3.13:Deception |
| Jenya Lano | Carol Powers | Guest Starring | 1.20:Missing |
| Jonathan LaPaglia | FBI Special Agent Brent Langer | Guest Starring | 5.11:Tribes |
| Liza Lapira | NCIS Agent Michelle Lee | Guest Starring | 4.01:Shalom |
| Guest Starring | 4.02:Escaped | ||
| Guest Starring | 4.05:Dead and Unburied | ||
| Guest Starring | 4.08:Once A Hero | ||
| Guest Starring | 4.10:Smoked | ||
| Guest Starring | 4.15:Friends & Lovers | ||
| Guest Starring | 4.16:Dead Man Walking | ||
| Guest Starring | 4.24:Angel of Death | ||
| Brandon Largent | Corporal Kenneth Miller | Guest Starring | 3.16:Family Secret |
| Loren Lazerine | Security Guard George | Guest Starring | 1.19:Dead Man Talking |
| Melissa Lee | Sarah Fuentes | Co-Starring | 1.03:Seadog |
| Reggie Lee | Jonathan Chow | Guest Starring | 5.12:Stakeout |
| Stephen Lee | Chuck Bayliss | Guest Starring | 5.08:Designated Target |
| William Gregory Lee | Metro Police Sgt. Keith Archer | Guest Starring | 3.10:Probie |
| Scott Anthony Leet | Jason Edom | Guest Starring | 3.17:Ravenous |
| Philip Lenkowsky | Squeegee Man | Co-Starring | 5.12:Stakeout |
| Marcella Lentz-Pope | Amy Bright | Co-Starring | 4.10:Smoked |
| Ken Lerner | Albert Hencheck | Guest Starring | 3.21:Bloodbath |
| Adam Lieberman | U.S. Customs Officer Cruz | Co-Starring | 3.23:Hiatus (Part I) |
| Tina Lifford | Dr. Pamela Fox | Guest Starring | 2.14:Witness |
| Tess Lina | Nurse Maria Baliad | Guest Starring | 3.23:Hiatus (Part I) |
| Guest Starring | 3.24:Hiatus (Part II) | ||
| David Lipper | Marine Sgt. Roger Caine | Guest Starring | 2.15:Caught on Tape |
| John Littlefield | Stovic's Aide | Guest Starring | 1.06:High Seas |
| Ming Lo | Davey Chen | Guest Starring | 4.08:Once A Hero |
| Geoffrey Lower | Navy Cmdr. Robert Morris | Guest Starring | 3.05:Switch |
| Katie Lowes | Bryn Landers | Guest Starring | 4.22:In The Dark |
| Michael Lowry | Lt. Cmdr. Akron, XO, USS Philadelphia | Guest Starring | 1.07:Sub Rosa |
| Rob Luke | P.A. | Co-Starring | 2.11:Black Water |
| Dan Lundy | Technician | Co-Starring | 1.23:Reveille |
| Jamie Luner | Amanda Reed/Lt. Cmdr. Voss | Guest Starring | 1.19:Dead Man Talking |
| Alexandra Lydon | Natalie Dalton | Guest Starring | 4.17:Skeletons |
| Amy Lyndon | Goldilocks | Co-Starring | 5.12:Stakeout |
| Elena Lyons | Diane Fontaine | Guest Starring | 1.03:Seadog |
| Jennifer Lyons | Zoey | Guest Starring | 1.17:The Truth Is Out There |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Amanda MacDonald | Norah Webb {uncr} | Guest Starring | 2.21:Hometown Hero |
| James MacDonald | Capt. Faul | Also Starring | 1.02:Hung Out to Dry |
| Scott MacDonald | Roger Cooke, Militia Leader | Guest Starring | 1.21:Split Decision |
| Laird Macintosh | Corporal Stinson | Co-Starring | 2.05:The Bone Yard |
| Marguerite MacIntyre | _ | Guest Starring | 1.11:Eye Spy |
| J.C. Mackenzie | Mitchell Reese | Guest Starring | 4.21:Brothers in Arms |
| Patrick Macmanus | Seaman Apprentice Sparks | Co-Starring | 1.11:Eye Spy |
| Dwayne Macopson | Marine Major Carl Pritchard | Co-Starring | 1.01:Yankee White |
| Christopher Maher | Capt. Aris Mahir | Guest Starring | 3.23:Hiatus (Part I) |
| Guest Starring | 3.24:Hiatus (Part II) | ||
| Michael Maize | Security Guard | Co-Starring | 1.01:Yankee White |
| Austin Majors | Jeremy Hodges | Guest Starring | 3.19:Iced |
| Kali Majors | Sarah Niles | Co-Starring | 4.06:Witch Hunt |
| Karl Makinen | Marine Staff Sgt. James Dawson | Guest Starring | 3.14:Light Sleeper |
| Matt Malloy | George Pardo | Guest Starring | 3.09:Frame Up |
| Rizwan Manji | Dr. Pandy | Guest Starring | 2.22:SWAK |
| Robert Manning, Jr. | Officer Alex Taylor | Co-Starring | 2.19:Conspiracy Theory |
| William Mapother | Hooded Man/Kyle Grayson | Guest Starring | 2.01:See No Evil |
| David Marciano | Bartender | Guest Starring | 2.04:Lt. Jane Doe |
| Jordan Marder | Pirate #2 | Co-Starring | 5.06:Chimera |
| Harriet Margulies | Attractive Older Woman | Co-Starring | 2.09:Forced Entry |
| Older Woman | Co-Starring | 4.02:Escaped | |
| Brian Markinson | Marine EOD Sgt. Dan Trask | Guest Starring | 4.17:Skeletons |
| Jeff Marlow | Survivalist Trainee #1 | Co-Starring | 5.09:Lost & Found |
| Austin Noah Marques | Billy Fuentes | Co-Starring | 1.02:Hung Out to Dry |
| John Marrott | Master Chief P.O. Roo | Co-Starring | 1.11:Eye Spy |
| Matthew Marsden | Navy Lt. Roy Sanders | Guest Starring | 4.16:Dead Man Walking |
| Chris William Martin | Brian Matthews/Taylor | Guest Starring | 5.09:Lost & Found |
| Rudolf Martin | Ari Haswari | Guest Starring | 1.16:Bête Noire |
| Guest Starring | 1.23:Reveille | ||
| Guest Starring | 2.23:Twilight | ||
| Special Guest Stars | 3.01:Kill Ari (Part I) | ||
| Special Guest Stars | 3.02:Kill Ari (Part II) | ||
| Jamie Martz | PO1 Marc Hobie | Guest Starring | 3.15:Head Case |
| Madison Mason | Marine Lt. Colonel Bushnell | Guest Starring | 2.17:An Eye For An Eye |
| Mark Matkevich | Jake | Guest Starring | 5.05:Leap of Faith |
| April Matson | Carolyn | Guest Starring | 4.09:Twisted Sister |
| Abigail Mavity | Jordyn Wright | Guest Starring | 5.12:Stakeout |
| David McCallum | Dr. Donald "Ducky" Mallard | And [Starring] | 1.01:Yankee White - 5.14:Internal Affairs |
| Casey McCarthy | Biker Chick | Co-Starring | 1.08:Minimum Security |
| Victor McCay | Ash | Guest Starring | 1.11:Eye Spy |
| Kevin McClatchy | Lt. David Cameron | Guest Starring | 1.15:Enigma |
| Tom McCleister | _ | Guest Starring | 1.12:My Other Left Foot |
| Kevin McCorkle | Col. Dan McClafferty | Guest Starring | 1.08:Minimum Security |
| Constance L. McCrory | Evidence Clerk | Co-Starring | 1.16:Bête Noire |
| Gerald McCullouch | FBI Agent | Guest Starring | 1.01:Yankee White |
| Dean McDermott | Lt. Col. Allan Witten | Guest Starring | 2.19:Conspiracy Theory |
| Rebecca McFarland | Det. Rapp | Guest Starring | 2.12:Doppelgänger |
| Jack McGee | Det. Curtis Floyd | Guest Starring | 2.14:Witness |
| Michael Patrick McGill | Joey Kelly | Guest Starring | 4.23:Trojan Horse |
| Sean McGowan | _ | Guest Starring | 1.14:The Good Samaritan |
| Danica McKellar | Erin Kendall | Guest Starring | 2.14:Witness |
| Gil McKinney | Crewman | Co-Starring | 1.06:High Seas |
| Michael McLafferty | Kyle | Co-Starring | 1.04:The Immortals |
| Derrick McMillon | Lt. Scott Bowen | Guest Starring | 5.13:Dog Tags |
| Doris E. McMillon | News Anchor | Co-Starring | 1.01:Yankee White |
| Kate McNeil | Cmdr. Green | Guest Starring | 1.14:The Good Samaritan |
| Graham McTavish | Aleksei | Guest Starring | 5.06:Chimera |
| Geoff Meed | _ | Guest Starring | 1.13:One Shot, One Kill |
| Ajay Mehta | Parviz Najar | Guest Starring | 4.11:Driven |
| Stephanie Mello | Cynthia Sumner | Co-Starring | 3.03:Mind Games |
| NCIS Tech Cynthia Sumner | Co-starring | 3.06:The Voyeur's Web | |
| Cynthia Sumner | Co-starring | 3.10:Probie | |
| Co-Starring | 3.11:Model Behavior | ||
| Co-Starring | 3.16:Family Secret | ||
| Co-Starring | 3.18:Bait | ||
| Co-Starring | 3.22:Jeopardy | ||
| Co-Starring | 3.24:Hiatus (Part II) | ||
| Co-Starring | 4.02:Escaped | ||
| Co-Starring | 4.14:Blowback | ||
| Co-Starring | 4.15:Friends & Lovers | ||
| Guest Starring | 4.23:Trojan Horse | ||
| Guest Starring | 4.24:Angel of Death | ||
| Mauricio Mendoza | Rico Caldas | Guest Starring | 3.18:Bait |
| Alex Meneses | Vanessa (Waitress) | Guest Starring | 1.20:Missing |
| Stephanie Michels | Sean Oliver | Guest Starring | 3.15:Head Case |
| Scott Miles | Pvt. Bellows | {co-starring} | 2.07:Call of Silence |
| J. Robin Miller | Lt. Connors | Guest Starring | 1.07:Sub Rosa |
| E. Roger Mitchell | M.P. | Co-Starring | 1.08:Minimum Security |
| Brandon Molale | Army CID Special Agent Jack Reynolds | Co-Starring | 4.13:Sharif Returns |
| Armando Molina | Miguel Fernandez | Co-Starring | 4.04:Faking It |
| David Monahan | PO Drew | Guest Starring | 1.07:Sub Rosa |
| Lawrence Monoson | Adam O'Neill | Guest Starring | 3.03:Mind Games |
| Christopher Michael Moore | Miles Larson | Guest Starring | 4.10:Smoked |
| Zakk Moore | Potential Recruit | Co-Starring | 1.13:One Shot, One Kill |
| Elizabeth Morehead | _ | Guest Starring | 1.04:The Immortals |
| Gary Morgan | Mario Vincetti | Co-Starring | 4.23:Trojan Horse |
| Grinnell Morris | FBI Agent Carlson | Co-Starring | 1.15:Enigma |
| Phil Morris | Capt. Paul Martino, USN | Guest Starring | 3.13:Deception |
| James Morrison | _ | Guest Starring | 1.11:Eye Spy |
| Glenn Morshower | Cmdr. Robert Peters, USS Philadelphia | Guest Starring | 1.07:Sub Rosa |
| William R. Moses | DEA Agent Kent Fuller | Guest Starring | 1.03:Seadog |
| Jamie Moss | Seaman Apprentice | Co-Starring | 1.07:Sub Rosa |
| Mary Mouser | Gibbs's daughter | Co-Starring | 3.07:Honor Code |
| Kelly Gibbs | Co-Starring | 3.23:Hiatus (Part I) | |
| Co-Starring | 4.02:Escaped | ||
| Co-Starring | 4.06:Witch Hunt | ||
| Kieran Mulroney | _ | Guest Starring | 1.04:The Immortals |
| Lochlyn Munro | Kevin Holt | Guest Starring | 2.18:Bikini Wax |
| Ben Murphy | Captain, sub base | Guest Starring | 1.07:Sub Rosa |
| Chad W. Murray | Seaman MacDonald [deceased] | Co-Starring | 1.04:The Immortals |
| Sean Murray | Agent Tim McGee | Guest Starring | 1.07:Sub Rosa |
| Guest Starring | 1.11:Eye Spy | ||
| Guest Starring | 1.18:UnSEALed | ||
| Guest Starring | 1.19:Dead Man Talking | ||
| Guest Starring | 1.20:Missing | ||
| Guest Starring | 1.21:Split Decision | ||
| Guest Starring | 1.22:A Weak Link | ||
| Guest Starring | 1.23:Reveille | ||
| Starring | 2.01:See No Evil - 5.14:Internal Affairs | ||
| Garikayi Mutambirwa | Augie Breen | Guest Starring | 4.06:Witch Hunt |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Bobby Neely | Roland Alan Moore | {co-starring} | 2.06:Terminal Leave |
| Navid Negahban | Jimmy Shaloub | Guest Starring | 4.18:Iceman |
| Corin Nemec | Len Grady | Guest Starring | 4.17:Skeletons |
| Alex Nesic | Alex Rudd | Guest Starring | 3.22:Jeopardy |
| Matthew Ness | Spencer | Co-Starring | 2.08:Heart Break |
| Benny Nieves | Frank Trujillo | Guest Starring | 1.03:Seadog |
| Craig Nigh | Melvin | Co-Starring | 4.24:Angel of Death |
| Barbara Niven | Dr. Elaine Burns | Guest Starring | 3.04:Silver War |
| Kate Norby | Diane Russio | Guest Starring | 4.16:Dead Man Walking |
| Dean Norris | GSgt. Vestman | Guest Starring | 1.12:My Other Left Foot |
| Nolan North | Officer Lou Giotti | Guest Starring | 4.04:Faking It |
| Dane Northcutt | Marine Major Kerry | Guest Starring | 1.01:Yankee White |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Sean O'Bryan | David Shields | Guest Starring | 2.06:Terminal Leave |
| David O'Donnell | unknown | Guest Starring | 1.07:Sub Rosa |
| Gerard O'Donnell | Navy Lt. Cmdr. Scott Willis | Guest Starring | 2.02:The Good Wives Club |
| Conor O'Farrell | William Danforth | Guest Starring | 3.16:Family Secret |
| Taryn O'Neill | Assistant | Co-starring | 3.10:Probie |
| Terry O'Quinn | Marine Colonel Will Ryan | Guest Starring | 1.15:Enigma |
| James O'Shea | Navy Lt. Sean Ferris | Guest Starring | 5.06:Chimera |
| Byrne Offutt | Judd Kearns | Co-Starring | 3.04:Silver War |
| Kim Oja | Karen Wilkerson | Guest Starring | 2.12:Doppelgänger |
| Kelsey Oldershaw | Navy Nurse Lt. Emma Ingham | Guest Starring | 2.22:SWAK |
| Chris Olivero | Dave Simmons | Guest Starring | 1.03:Seadog |
| Morocco Omari | NCIS Special Agent Thomas Survoy | Guest Starring | 3.12:Boxed In |
| Peter Onorati | Chief of the Boat ("COB") | Guest Starring | 1.07:Sub Rosa |
| Holmes Osborne | Fred Hanlan | Guest Starring | 2.13:The Meat Puzzle |
| Rick Otto | Adrian Nelson | Guest Starring | 5.02:Family |
| Jeremy Overstreet | Agent Bowman | Co-Starring | 1.01:Yankee White |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Dominic Pace | Vincent Pazzo | Co-Starring | 3.07:Honor Code |
| Mikki Padilla | Leanne Roberts | Co-starring | 3.06:The Voyeur's Web |
| Jorge-Luis Pallo | Lt. Matthew Sanchez | Guest Starring | 5.13:Dog Tags |
| Jimmy Palumbo | Stage Manager | Guest Starring | 2.11:Black Water |
| Marty Papazian | Sgt. Jake Roberts | Guest Starring | 3.06:The Voyeur's Web |
| Dempsey Pappion | Basketball Player | Guest Starring | 1.03:Seadog |
| James Parks | Brian Sikes | Guest Starring | 5.11:Tribes |
| Jim Parrack | Nick Hurley | Guest Starring | 4.14:Blowback |
| Ben Parrillo | Rex Eberlee | Guest Starring | 2.23:Twilight |
| Tony Pasqualini | _ | Guest Starring | 1.12:My Other Left Foot |
| Rick Pasqualone | Cpl. Paul Dafelmair | Also Starring | 1.02:Hung Out to Dry |
| Colby Paul | Skateboard Kid #1 | Co-starring | 3.06:The Voyeur's Web |
| Scott Paulin | Navy Capt. Kevin Dorn | Guest Starring | 3.20:Untouchable |
| Miguel Perez | Federal Marshal Van Driver | Guest Starring | 2.10:Chained |
| Pauley Perrette | Forensics Specialist Abby Sciuto | Starring | 1.01:Yankee White - 5.14:Internal Affairs |
| Paul Perri | _ | Guest Starring | 1.23:Reveille |
| Jeff Peterson | Brad | Co-Starring | 1.04:The Immortals |
| Kimberlee Peterson | Navy Lt. Keira Napleton | Guest Starring | 3.20:Untouchable |
| Elizabeth Peña | FBI Agent Lina Reyes | Guest Starring | 2.06:Terminal Leave |
| Tripp Pickell | Petty Officer Pete Bidwell | Co-Starring | 5.13:Dog Tags |
| Jeffrey Pierce | Marine Sgt. Michael McMannis | Guest Starring | 3.11:Model Behavior |
| Geoff Pierson | Roy Carver | Guest Starring | 4.04:Faking It |
| Alan Pietruszewski | Navy Captain Tom Zill | Co-Starring | 3.24:Hiatus (Part II) |
| Robert Pine | Golfer Ben ? | Guest Starring | 1.05:The Curse |
| Jim Pirri | ex-ENS Randy Wiles ? | Guest Starring | 1.05:The Curse |
| Jesse Plemons | Jason Geckler | Guest Starring | 3.13:Deception |
| John Pleshette | Tom Crawley | Guest Starring | 3.11:Model Behavior |
| Eyal Podell | Namir Eschel | Guest Starring | 4.01:Shalom |
| Colleen Porch | Jill Meyers | Guest Starring | 2.14:Witness |
| Ely Pouget | Julie Watson | Guest Starring | 2.01:See No Evil |
| Arnell Powell | Abraham Moussalah | Guest Starring | 4.07:Sandblast |
| Brittney Powell | Jamie Carr | Guest Starring | 3.06:The Voyeur's Web |
| Dave Power | Cpl. Dave Ramsey | Also Starring | 1.02:Hung Out to Dry |
| Lawrence Pressman | Secret Service Director | Guest Starring | 1.01:Yankee White |
| Dr. Russell Pike | Guest Starring | 4.11:Driven | |
| Lindsay Price | Navy Lt. Pam Kim | Guest Starring | 2.09:Forced Entry |
| Guest Starring | 3.09:Frame Up | ||
| Kristin Proctor | 1st Lt. Susan Ellsworth | Co-Starring | 2.17:An Eye For An Eye |
| Wayne Péré | Stanley Springer | Guest Starring | 4.02:Escaped |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Kevin Quigley | William the Truthteller | Guest Starring | 2.19:Conspiracy Theory |
| Francesco Quinn | GSgt. Freddy Alvarez | Guest Starring | 1.13:One Shot, One Kill |
| Luis Romero | Guest Starring | 4.08:Once A Hero |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Brenna Radding | Kelly Gibbs | Co-Starring | 5.07:Requiem |
| Paul Rae | Steve Hager | Guest Starring | 2.21:Hometown Hero |
| David Raibon | Survivalist Trainee #2 | Co-Starring | 5.09:Lost & Found |
| Victor Raider-Wexler | Patrick Carmody | Guest Starring | 4.12:Suspicion |
| Dominic Rains | Jamal Malik | Guest Starring | 4.19:Grace Period |
| David Ramsey | Agent Richard Owens | Guest Starring | 1.05:The Curse |
| Dylan Ramsey | Asad Al Qutaji | Co-Starring | 4.12:Suspicion |
| Kevin Rankin | Dennis Moran | Guest Starring | 5.12:Stakeout |
| Steve Rankin | Sgt. Bill Atlas | Guest Starring | 1.20:Missing |
| Jim Rash | Dr. Joel Sanderson | Guest Starring | 1.10:Left for Dead |
| Matthew Rauch | _ | Guest Starring | 1.23:Reveille |
| Tania Raymonde | Anna Real | Guest Starring | 2.17:An Eye For An Eye |
| Jonathan Redford | Corpsman Timothy Morgan | Guest Starring | 2.19:Conspiracy Theory |
| Virginia Reece | Allison Donovan | Co-Starring | 2.17:An Eye For An Eye |
| Ben Reed | Chief Petty Officer Ian Goetz | Guest Starring | 2.04:Lt. Jane Doe |
| Lee Reherman | Sgt. Tuers | Also Starring | 1.02:Hung Out to Dry |
| Robert Reinis | Drew Paragon | Co-Starring | 4.06:Witch Hunt |
| Marcus Reynaga | Paramedic | Co-Starring | 3.23:Hiatus (Part I) |
| Terry Rhoads | _ | Guest Starring | 1.12:My Other Left Foot |
| Phillip Rhys | Yussif | Guest Starring | 3.08:Under Covers |
| Suzanne Rico | [Reporter] Suzanne McRobert | {co-starring} | 2.06:Terminal Leave |
| Reporter [Suzanne McRobert] | Co-Starring | 3.19:Iced | |
| Matt Riedy | Navy Rear Adm. Kenneth Kirkland | Co-Starring | 5.08:Designated Target |
| Robin Riker | Saleena Lockhart | Guest Starring | 2.11:Black Water |
| Conrad Roberts | Benjamin King | Guest Starring | 2.16:Pop Life |
| Jeremy A. Roberts | Marine Corporal Liam O'Neill | Co-Starring | 4.18:Iceman |
| Jonno Roberts | Scott Pell | Guest Starring | 4.15:Friends & Lovers |
| Leonard Roberts | PO Howard Carter | Guest Starring | 1.17:The Truth Is Out There |
| Daniel Roebuck | Port Security Chief Matthew Lake | Guest Starring | 3.12:Boxed In |
| Sasha Roiz | NCIS Agent Rick Hall | Guest Starring | 4.19:Grace Period |
| Cristine Rose | Patricia Stone, Real Estate Agent | Guest Starring | 1.19:Dead Man Talking |
| Julia Rose | Female Bartender | Guest Starring | 2.04:Lt. Jane Doe |
| Michael Edward Rose | Walter Richter | Co-Starring | 1.10:Left for Dead |
| Thea Rose | Chrissy Wayne | Co-Starring | 3.15:Head Case |
| John Rosenfeld | FBI Agent Charles | Guest Starring | 1.15:Enigma |
| Guest Starring | 2.05:The Bone Yard | ||
| David Rountree | Surveillance Technician | Co-Starring | 1.15:Enigma |
| Rowdy | Jethro {the Dog} | Co-Starring | 5.13:Dog Tags |
| John Rubinstein | _ | Guest Starring | 1.09:Marine Down |
| Ruth Rudnick | Gina Goodwin | Guest Starring | 3.14:Light Sleeper |
| Reed Rudy | Air Transport Officer | Co-Starring | 1.07:Sub Rosa |
| Robert Rusler | Marine Lt. Colonel Curtis Teague | Guest Starring | 2.03:Vanished |
| Tim Russ | Jerry Kemper | Guest Starring | 3.22:Jeopardy |
| Deanna Russo | Ashley | Guest Starring | 5.05:Leap of Faith |
| Leon Russom | Grandpa | Guest Starring | 1.18:UnSEALed |
| Tim Ryan | Greg Boyen | Guest Starring | 2.06:Terminal Leave |
| James Ryen | Seaman | Co-Starring | 5.13:Dog Tags |
| Actor | Character | Credit | Episode |
|---|---|---|---|
| Joe Sabatino | HRT Leader Horowitz | Guest Starring | 1.16:Bête Noire |
| Hilary Salvatore | P.O. Jessica Smith | Guest Starring | 2.19:Conspiracy Theory |
| Rigo Sanchez | Boyfriend | Co-Starring | 1.06:High Seas |
| Jonathan Sandowski | Lt. Norski | Co-Starring | 1.06:High Seas |
| Susan Santiago | Camila Charo | Guest Starring | 3.24:Hiatus (Part II) |
| Guest Starring | 4.01:Shalom | ||
| Mariela Santos | Jane Doe | 2.04:Lt. Jane Doe | |
| Carlos Sanz | _ | Guest Starring | 1.09:Marine Down |
| Al Sapienza | Cmdr. William Foley | Guest Starring | 1.18:UnSEALed |
| Sam Sarpong | Bobby Jackson | Guest Starring | 1.03:Seadog |
| Michael Sarysz | Corporal James Travis | Co-Starring | 1.09:Marine Down |
| Doug Savant | Father Larry Clannon | Guest Starring | 1.22:A Weak Link |
| Stelio Savante | Danny Coyle | Guest Starring | 5.07:Requiem |
| Ned Schmidtke | Congressman Frank Getz | Guest Starring | 4.08:Once A Hero |
| Paul Schulze | Marine Major Ken Meyers | Guest Starring | 3.18:Bait |
| Lorna Scott | Sally Parker | Guest Starring | 2.11:Black Water |
| Rodney Scott | Brian Dempsey | Guest Starring | 3.22:Jeopardy |
| Anson Scoville | PO2 Peter Shrewe | Guest Starring | 1.06:High Seas |
| Mik Scriba | unknown | Guest Starring | 1.07:Sub Rosa |
| Nick Searcy | Joseph Barnes | Guest Starring | 5.02:Family |
| Noah Segan | Teenager/Sniper | Guest Starring | 1.13:One Shot, One Kill |
| Albie Selznick | Marty Allen | Guest Starring | 4.04:Faking It |
| Marc Senter | Pvt. Stearns | {co-starring} | 2.07:Call of Silence |
| Greta Sesheta | Receptionist | {co-starring} | 3.15:Head Case |
| Edmund L. Shaff | Building Manager Norm | Guest Starring | 1.19:Dead Man Talking |
| Dave Shalansky | Delivery Man | Co-Starring | 2.13:The Meat Puzzle |
| Monti Sharp | Handler | Co-Starring | 1.06:High Seas |
| Judi Shekoni | Natalie Vance | Guest Starring | 3.11:Model Behavior |
| Parry Shen | Ben Richmond | Guest Starring | 1.11:Eye Spy |
| Michael A. Shepperd | Mailman | Co-Starring | 5.07:Requiem |
| Blake Shields | _ | Guest Starring | 1.13:One Shot, One Kill |
| Graham Shiels | Martin Jansen | Guest Starring | 4.06:Witch Hunt |
| Kent Shocknek | Male Reporter | Co-Starring | 1.13:One Shot, One Kill |
| Guy Ross | Co-Starring | 3.11:Model Behavior | |
| Daniel Jay Shore | P.O. Benny Horlacher | Guest Starring | 2.17:An Eye For An Eye |
| Christopher Shyer | Kyle Boone | Guest Starring | 3.03:Mind Games |
| John Siciliano | Marine PFC Nathan Stone | Guest Starring | 5.10:Corporal Punishment |
| Matt Sigloch | Man | Co-Starring | 1.23:Reveille |
| Mark Sivertsen | _ | Guest Starring | 1.04:The Immortals |
| Kevin Sizemore | SSgt. Grimm {uncr} | Guest Starring | 1.21:Split Decision |
| M.P. Mueller {uncr} | Guest Starring | 2.07:Call of Silence | |
| Marine Sgt. William Moore | Guest Starring | 2.15:Caught on Tape | |
| Jon Sklaroff | Jonathan Redding | Guest Starring | 2.18:Bikini Wax |
| Vladimir Skomarovsky | Colonel-General Dimitri Borov | Guest Starring | 4.23:Trojan Horse |
| Haaz Sleiman | Abdul Wahid | Guest Starring | 4.19:Grace Period |
| Amy Sloan | Petty Officer Cynthia Cluxton | Guest Starring | 2.04:Lt. Jane Doe |
| Brady Smith | David Cross | Guest Starring | 4.15:Friends & Lovers |
| Cotter Smith | Special Agent in Charge Sam Stevens | Guest Starring | 3.23:Hiatus (Part I) |
| Jason Alan Smith | Cpl. Wade Kean | {co-starring} | 2.07:Call of Silence |
| Patrick Robert Smith | Tim Gerber | Co-Starring | 4.21:Brothers in Arms |
| Scott Alan Smith | Det. Mark Mauceri | Guest Starring | 2.16:Pop Life |
| Alan Smyth | Nick Kerry | Guest Starring | 4.24:Angel of Death |
| Bradley Snedeker | Petty Officer Carnahan | Co-Starring | 1.04:The Immortals |
| Johnny Sneed | CIA Agent Kramer | Guest Starring | 1.22:A Weak Link |
| Sky Soleil | Bill | Co-Starring | 4.24:Angel of Death |
| Alex Solowitz | Dave | Co-Starring | 1.13:One Shot, One Kill |
| Gary Sommers | John Benedict | Co-starring | 3.10:Probie |
| Christinia Souza | Rosemarie Fuentes | Co-Starring | 1.02:Hung Out to Dry |
| Douglas Spain | Ceasar Bernal | Guest Starring | 3.19:Iced |
| Joe Spano | FBI Agent T.C. Fornell | Guest Starring | 1.01:Yankee White |
| Guest Starring | 1.03:Seadog | ||
| Guest Starring | 1.15:Enigma | ||
| Guest Starring | 1.23:Reveille | ||
| Senior FBI Agent T.C. Fornell | Guest Starring | 2.05:The Bone Yard | |
| Guest Starring | 2.19:Conspiracy Theory | ||
| Guest Starring | 2.23:Twilight | ||
| Guest Starring | 3.02:Kill Ari (Part II) | ||
| Guest Starring | 3.08:Under Covers | ||
| Guest Starring | 3.09:Frame Up | ||
| Guest Starring | 4.02:Escaped | ||
| Guest Starring | 4.10:Smoked | ||
| Guest Starring | 4.21:Brothers in Arms | ||
| Guest Starring | 4.24:Angel of Death | ||
| Guest Starring | 5.04 |
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