- Benjamin Bratt
- Â Maj. Jim Tisnewski / ... 23 episodes, 2005-2006
- Aunjanue Ellis-Taylor
- Â MSgt. Jocelyn Pierce 23 episodes, 2005-2006
- Dennis Hopper
- Â Col. Eli McNulty 23 episodes, 2005-2006
- Kelly Rutherford
- Â Samantha 'Sonny' Liston 21 episodes, 2005-2006
- Kerr Smith
- Â Bobby Wilkerson 16 episodes, 2005-2006
- Maurice Compte
- Â Charlie Gutierrez 11 episodes, 2005-2006
- Joe Morton
- Â Steven Algazi 9 episodes, 2005-2006
- Kelsey Oldershaw
- Â Angie Aronson 8 episodes, 2005
- Tavis Bohlinger
- Â Mark 'Doc' Jones / ... 2 episodes, 2006
- Ashley Williams
- Â Beth Wilkerson 6 episodes, 2005-2006
- Al Whiting
- Â Military 4 episodes, 2005
- Andrew McCarthy
- Â Aaron Gerrity 5 episodes, 2005
- Brittany Ishibashi
- Â Ashley Nakahino 4 episodes, 2005-2006
- Joel David Moore
- Â Greg - NSA Liaison 4 episodes, 2005-2006
- John Lafayette
- Â Three Star General 4 episodes, 2005-2006
- Mitch Morris
- Â Ken Watkins 5 episodes, 2005-2006
- Jonathan Banks
- Â Adm. Cooper - Dir. of Joint Staff 4 episodes, 2005
- Robert Picardo
- Â Larry Kincaid 4 episodes, 2005-2006
- Jack Kehler
- Â Captain Shea 4 episodes, 2005-2006
- Yasmine Delawari
- Â Maya / ... 3 episodes, 2005-2006
- Jaime Ray Newman
- Â Natalie Hughes 4 episodes, 2006
- Billy Brown
- Â MSgt. Meeks 3 episodes, 2005-2006
- Alan Dale
- Â Raymond Metcalf 3 episodes, 2005
- Ankur Bhatt
- Â Javed Bakar 3 episodes, 2006
- Jared Chandler
- Â Mike 'Gramps' Shawn 3 episodes, 2005-2006
- John D. LeMay
- Â Congressman Rosenblatt 3 episodes, 2006
- Bob Gunton
- Â General Hughes 3 episodes, 2006
- Tino Struckmann
- Â Army Officer / ... 3 episodes, 2005-2006
- Orion McCabe
- Â Army Checkpoint Security (#1.21) / ... 3 episodes, 2005-2006
- Andrew Borba
- Â Brendan Turrell 2 episodes, 2005
- Madison Mason
- Â Chairman of Joint Chiefs 2 episodes, 2005
- Richard Kind
- Â Asst. Public Affairs Sec. Danton Murphy 2 episodes, 2005
- Kirk B.R. Woller
- Â CIA Deputy Inspector General Mitchell Sykes 2 episodes, 2005
- Maximillian Decker
- Â Alejandro Aguilar 2 episodes, 2005
- Steven Schub
- Â CIA Watch Commander 2 episodes, 2005
- Michael Wiseman
- Â Commander 2 episodes, 2005
- Travis Wester
- Â Marine Michael Delroy 2 episodes, 2005
- Sam Hennings
- Â Col. David Lindstrom 2 episodes, 2005-2006
- Michael Hyatt
- Â Agent Kathryn Thompson 2 episodes, 2005
- Sara Arrington
- Â Erin Barrett - McNulty's daughter / ... 2 episodes, 2005-2006
- Robert Aguilar Jr.
- Â Iranian Soldier / ... 2 episodes, 2005
- John Fletcher
- Â Mr. Aaronson 2 episodes, 2005
- Alex Fernandez
- Â Jose Aguilar 2 episodes, 2005
- Andrew Breznick
- Â CIA Field Operative 1 episode, 2005
- Tony Cheng
- Â Chinese Soldier 2 episodes, 2005
- James Huang
- Â Chinese Agent 1 episode, 2005
- David Mattey
- Â Chechen Bodyguard 1 episode, 2005
- Kevin Sizemore
- Â Intelligence Officer Cole 2 episodes, 2005
- Al Coronel
- Â Air Traffic Control Supervisor / ... 2 episodes, 2005-2006
- Shauna Stoddart
- Â Agent Roma McCoy / ... 2 episodes, 2005-2006
- Verton R. Banks
- Â Ensign Brown 1 episode, 2005
- Jennifer Chu
- Â Kit Yee Cheung 2 episodes, 2005
- Brad Beyer
- Â Damon 2 episodes, 2006
- Karl Calhoun
- Â Army Security Guard 2 episodes, 2006
- Leonor Varela
- Â Lt. Col. Cat Rodriguez 1 episode, 2005
- Maggie Wheeler
- Â Investigator 1 episode, 2005
- Katrina Begin
- Â Lila Sutter 1 episode, 2005
- Robert Joy
- Â Mark Boskovich 1 episode, 2005
- Sasha Alexander
- Â Allyson Merrill 1 episode, 2006
- Alex Carter
- Â Gen. Ian Maguire 1 episode, 2006
- Gabriel Olds
- Â Richard Woodley 1 episode, 2005
- James MacDonald
- Â FBI Incident Commander Hall 1 episode, 2005
- Bruce Thomas
- Â Dr. Wolfe 1 episode, 2006
- Spencer Garrett
- Â Norman 'Doc' Wiley 1 episode, 2006
- Mel Harris
- Â U.S.Ambassador to Spain 1 episode, 2006
- Anil Kumar
- Â Mustaffeh Muhammed 1 episode, 2006
- Marshall Bell
- Â Col. James Tisnewski, Sr., USMC Ret. 1 episode, 2005
- Tom Wright
- Â General Kuwendi, Suriname Attache 1 episode, 2005
- Maz Jobrani
- Â Mohammed Safid 1 episode, 2005
- Camille Saviola
- Â Secretary of Colonel McNulty 1 episode, 2005
- Tony Perez
- Â Mr. Navarro 1 episode, 2005
- Chad Everett
- Â Gen. Long - Army Chief of Staff 1 episode, 2006
- Kristof Konrad
- Â Ivan the Translator 1 episode, 2006
- Matthew Glave
- Â CIA Agt. John Haines 1 episode, 2005
- Adam Kaufman
- Â Jared Vogel 1 episode, 2005
- Gonzalo Menendez
- Â Agent Danny Marco 1 episode, 2005
- Paul Francis
- Â Capt. O'Brien 1 episode, 2005
- Cy Fergusson
- Â General Steven Ndeke 1 episode, 2005
- Jonathan Penner
- Â FBI Agent Jaffe 1 episode, 2006
- Chris Gartin
- Â Brian Sheffer 1 episode, 2006
- James Handy
- Â Congressman Hal Lovett 1 episode, 2005
- Michael Cavanaugh
- Â U.S. Ambassador: Suriname 1 episode, 2005
- Jonathan Halyalkar
- Â Mehra 1 episode, 2005
- Kevin Alejandro
- Â Miguel Carrera 1 episode, 2006
- Matthew John Armstrong
- Â Genuzzi 1 episode, 2006
- Larry Sullivan
- Â Army Staff Sgt. Michaels 1 episode, 2006
- Evan Parke
- Â Kamal Jones 1 episode, 2006
- Eyal Podell
- Â Wilson 1 episode, 2006
- Deirdre Quinn
- Â Sharon Starkey 1 episode, 2005
- Stacy Meadows
- Â Marine Zachary McPhearson 1 episode, 2005
- Cas Anvar
- Â Nasir 1 episode, 2006
- Mark Derwin
- Â Captain Miller 1 episode, 2006
- Ilia Volok
- Â Petrovich 1 episode, 2006
- Scott Atkinson
- Â Seth Lovett 1 episode, 2005
- Ned Vaughn
- Â Lieutenant Bradshaw 1 episode, 2005
- Jay Harik
- Â Behras 1 episode, 2005
- Iris Bahr
- Â Rosa 1 episode, 2006
- Ivo Nandi
- Â Spanish Nat'l Police Det. Ruiz 1 episode, 2006
- Blake Robbins
- Â James Ogilvy 1 episode, 2006
- Patrick Fischler
- Â Mark Sinclair 1 episode, 2005
- Bernard White
- Â Iman Houchi Kazemi 1 episode, 2005
- Rene Raymond Rivera
- Â Javier Catalan 1 episode, 2005
- Yasen Peyankov
- Â Dima 1 episode, 2005
- Rizwan Manji
- Â Officer ISI 1 episode, 2006
- Gavin Fink
- Â Henry Maguire 1 episode, 2006
- Gary Carlos Cervantes
- Â Dan Cassidy 1 episode, 2005
- Theo Kypri
- Â Tariq Mahayni 1 episode, 2005
- Ariel Felix
- Â Manny Bagaya 1 episode, 2005
- Ajay Mehta
- Â General Hafeez 1 episode, 2006
- Evan Helmuth
- Â Marcus 1 episode, 2005
- Christian Aubert
-  François - French Attachá 1 episode, 2005
- Robert Joseph
- Â General Joseph Perere 1 episode, 2005
- Matt Gerald
- Â Robbie Benvenuto 1 episode, 2005
- Peter Story
- Â Overwatcher 1 episode, 2005
- Ty Rushing
- Â SSO Raymond Fields 1 episode, 2006
- Joel Marshall
- Â FBI Agent #1 1 episode, 2005
- Maurizio Rasti
- Â Aasim 1 episode, 2006
- Andrew Thacher
- Â F.B.I. Agent #2 1 episode, 2005
- John Dennis
- Â Anthony 1 episode, 2006
- Thomas Conroy
- Â Air Force Colonel 1 episode, 2006
- Nicholas Kadi
- Â Muezzin 1 episode, 2005
- Courtney Andresen
- Â Waitress 1 episode, 2006
- Eric Laciste
- Â Communications Officer 1 episode, 2005
- Elizabeth J. Martin
- Â Female FBI Agent 1 episode, 2006
- Brian Silverman
- Â FBI Agent / ... 1 episode, 2006
- Annie Wersching
- Â Lieutenant 1 episode, 2005
- Susan Chuang
- Â Captain Trish Wong 1 episode, 2005
- Marco Khan
- Â Recruiter 1 episode, 2005
- Alain Uy
- Â Lead Commando 1 episode, 2005
- Chase Kim
- Â Centcom Officer 1 episode, 2005
- Shane Conrad
- Â Captain Weber 1 episode, 2005
- Elizabeth Sung
- Â Kit Yee's Mother 1 episode, 2005
- Jen Kuo Sung
- Â Chinese Perfume Vendor 1 episode, 2005
- Jennifer Dorogi
- Â Reporter 1 episode, 2005
- Keith Woulard
- Â Navy Seal Commander 1 episode, 2005
- Ken Luckey
- Â Soldier 1 episode, 2005
- Kathleen Mary Carthy
- Â Captain Banks 1 episode, 2005
- Kevin Will
- Â FBI Polygrapher 1 episode, 2005
- John Hemphill
- Â Secret Service Agt. 1 episode, 2005
- Tim Sabatino
- Â Delta Team Member 1 episode, 2005
- Delpaneaux Wills
- Â Tutsi Passenger 1 episode, 2005
- Jessica Irvine Drake
- Â Military Officer 1 episode, 2005
- Steven Littles
- Â Giant Man with Keys 1 episode, 2005
- Ariana Delawari
- Â Farah 1 episode, 2005
- Billy D. Lucas
- Â Seal #1 1 episode, 2005
- Lovensky Jean-Baptiste
- Â Surinamese Creole 1 episode, 2005
- Damien Luvara
- Â Marine 1 episode, 2005
- Michael Delgado
- Â Scott Navarro 1 episode, 2005
- Jody Booth
- Â Heather 1 episode, 2005
- Byrne Offutt
- Â Rick Weston 1 episode, 2005
- Richard Partlow
- Â Inspector General 1 episode, 2005
- Mark A. Nash
- Â CIA Agent 1 episode, 2005
- Susan Grace
- Â Estelle 1 episode, 2005
- Emil Pinnock
- Â Tutsi Driver 1 episode, 2005
- Stephen Silberkraus
- Â Army Officer 1 episode, 2005
- Therese McLaughlin
- Â Officer 1 episode, 2005
- Christopher Cho
- Â Military Aide 1 episode, 2005
- Lisa Gabriel
- Â Civilian Worker 1 episode, 2005
- Jade Hykush
- Â Muslim Woman with Web Site Sign 1 episode, 2005
- Tegan Summer
- Â Lieutenant Ganzais 1 episode, 2005
- Michael Patrick Larson
- Â NMCC Officer Burton 1 episode, 2005
- Ethan Hova
- Â Aarif 1 episode, 2005
- John Carey
- Â Army Lieutenant Colonel 1 episode, 2005
- Ben Northenor
- Â Embassy Marine 1 episode, 2005
- John Brody
- Â McNulty's son-in-law 1 episode, 2005
- María Esquivel
- Â Miss Colombia 1 episode, 2005
- Mary Calder
- Â Muslim Woman 1 episode, 2005
- Marsha Douglas
- Â Silvi 1 episode, 2005
- Matthew Benjamin
- Â JOD Sub Officer 1 episode, 2005
- Jackie Guin
- Â British Reporter 1 episode, 2005
- Rodney Choice
- Â Pentagon Policeman 1 episode, 2005
- Jay Campbell
- Â Bystander 1 episode, 2005
- Fredric Lehne
- Â General Moyer 1 episode, 2006
- Michael Grant Terry
- Â American Boy 1 episode, 2006
- Eric Ladin
- Â Sgt. Michael Polard 1 episode, 2006
- Dominic Rains
- Â Omar Al-Masadi 1 episode, 2006
- Kristin Richardson
- Â Princess Amelia 1 episode, 2006
- Christie Lynn Smith
- Â Gail Ellen 1 episode, 2006
- Patrick Sabongui
- Â Man 1 episode, 2006
- Denyse Tontz
- Â Princess Gabrielle 1 episode, 2006
- Max Arciniega
- Â Air Traffic Controller 1 episode, 2006
- Adair Tishler
- Â Ivan's Daughter 1 episode, 2006
- Lucila Solá
- Â ETA Representative 1 episode, 2006
- June Angela
- Â Dr. Foucault 1 episode, 2006
- Paull Walia
- Â Iraqi Soldier 1 episode, 2006
- Ron Bottitta
- Â SAS Col. Nigel Baggs 1 episode, 2006
- Eddie J. Fernandez
- Â Mexican Cop #2 1 episode, 2006
- Iman Nazemzadeh
- Â Adil Al-Masadi 1 episode, 2006
- Josh Clark
- Â General Ellis 1 episode, 2006
- Kelvin Han Yee
- Â Admiral Chin 1 episode, 2006
- Albie Selznick
- Â Carter Ewing 1 episode, 2006
- Tony Lee
- Â Captain Kim 1 episode, 2006
- Hrach Titizian
- Â Ziad 1 episode, 2006
- William Christopher Stephens
- Â Petty Officer 1 episode, 2006
- Julia Levy-Boeken
- Â Erika 1 episode, 2006
- Kavi Raz
- Â General Othman Raheem 1 episode, 2006
- Philip Shahbaz
- Â Palace Guard 1 episode, 2006
- Ricardo Herranz
- Â Colonel Tellez 1 episode, 2006
- Mel Fair
- Â Leland Kirkus 1 episode, 2006
- Craig Nigh
- Â Dr. Robert Coster 1 episode, 2006
- Christopher Stapleton
- Â Lt. Joshua Lindquist 1 episode, 2006
- Adam Leadbeater
- Â Royal M.P. 1 episode, 2006
- Merik Tadros
- Â News Anchor 1 episode, 2006
- Jennifer Jalene
- Â Lawyer 1 episode, 2006
- Jennifer Carta
- Â Caroline Herrera 1 episode, 2006
- Josh Wingate
- Â Skinhead #1 1 episode, 2006
- Tacey Adams
- Â S.A.I.C. 1 episode, 2006
- Corey Pearson
- Â Rocco Vitano 1 episode, 2006
- Marc Casabani
- Â Prince Amin 1 episode, 2006
- Harmoni Everett
- Â American Girl 1 episode, 2006
- Zuhair Haddad
- Â Abu Al-Hijazi 1 episode, 2006
- Dave Shalansky
- Â Ricky 1 episode, 2006
- Joel Bryant
- Â Grimy Chief 1 episode, 2006
- Van De La Plante
- Â Officer McMannus 1 episode, 2006
- Dylan Ramsey
- Â Al-Qaeda Operative 1 episode, 2006
- Haynes Brooke
- Â Dr. Bendetti 1 episode, 2006
- Kinsey McLean
- Â Embassy Marine Corporal 1 episode, 2006
- Rosemary Garris
- Â Hostage 1 episode, 2006
- Kate Emerick
- Â Princess Sasha 1 episode, 2006
- Jesus Mayorga
- Â Candy Kid 1 episode, 2006
- Nicholas Hosking
- Â London Policeman 1 episode, 2006
- Avner Garbi
- Â Al Mudtadji 1 episode, 2006
- Henry Barrial
- Â Professor Guillermo De La Serra 1 episode, 2006
- Bernard Zilinskas
- Â Analyst Bill Hendricks 1 episode, 2006
- John D. Kim
- Â Sonarman Chung 1 episode, 2006
- Sam Sako
- Â P.M. Malawi 1 episode, 2006
- Aaron Braxton
- Â Subway Cop 1 episode, 2006
- George Williams
- Â Ambassador Jansen 1 episode, 2006
- Zia Domic
- Â Edita Alic 1 episode, 2006
- Tony Noakes
- Â Lt. Colonel Flynn 1 episode, 2006
- Branden Weslee Kong
- Â Korean Officer 1 episode, 2006
- William De Vital
- Â Yuca Zubaz 1 episode, 2006
- Mariela Santos
- Â Gina Orasco 1 episode, 2006
- Desmond Faison
- Â Embassy Marine 1 episode, 2006
- Dave Marlin
- Â Mugniyah 1 episode, 2006
- Deirdre Wall
- Â Social Worker 1 episode, 2006
- Michael O'Haver
- Â Hostage 1 episode, 2006
- Bobby Pappas
- Â Declan Walters 1 episode, 2006
- Geza Decsy
- Â Pool Manager 1 episode, 2006
- Heidi Johnson
- Â Babe 1 episode, 2006
- Janelle Jones
- Â Claire Wilkerson 1 episode, 2006
- Antonio Costa
- Â Mossad Agent 1 episode, 2006
- Tanner Reid Carlson
- Â Danny jr 1 episode, 2006
- Amir Salehi
- Â Man 1 episode, 2006
- Dylan Shmueli
- Â Mossad Agent 1 episode, 2006
- Joan May
- Â Amy - Humanitarian Worker 1 episode, 2006
- Alex Back
- Â British Soldier 1 episode, 2006
- Kevin O'Keefe
- Â DPS Officer 1 episode, 2006
- Suzette Vargas
- Â Hotel Housekeeper 1 episode, 2006
- Sarah Clarke
- Â Jim's Wife 1 episode
- Scott Norris
- Â Pentagon Office Worker 1 episode
- John Branch
- Â Assistant to Col. McNulty (uncredited) 3 episodes, 2005
- Jared Day
- Â Christian Crusader / ... (uncredited) 2 episodes, 2005
- James Kohler
- Â CIA Field Operative (uncredited) 2 episodes, 2005
- Chris Neville
- Â Elint Officer (uncredited) 1 episode, 2005
- Lester G. Reynolds
- Â Pentagon Police (uncredited) 1 episode, 2005
- Bruce Holman
- Â Board Room / ... (uncredited) 1 episode, 2005
- Julius Callahan
- Â Hamude Roda (uncredited) 1 episode, 2005
- Jackson Lee
- Â Executed Prisoner #1 (uncredited) 1 episode, 2005
- Mark Anthony Vazquez
- Â Delta Team Leader (uncredited) 1 episode, 2005
- Alexander von Roon
- Â Lieutenant Colonel (uncredited) 1 episode, 2005
- James McMann
- Â Bar Patron (uncredited) 1 episode, 2005
- Laurie Fortier
- Â Dr. Valerie Levin (uncredited) 1 episode, 2006
- Ammar Ramzi Mahmood
- Â Guard David (uncredited) 1 episode, 2006
- Joe Dolan
- Â Army Guard (uncredited) 1 episode, 2006