List of 24 characters

  = Main cast (credited)

  = Recurring cast (4+)

  = Guest cast (1-3)

The following recurring guest stars appeared in at least five episodes or were distinguished in the guest star credits.

Key:   = Recurring

Key:   = Special Guest

• Kiefer Sutherland – Jack Bauer[1]
• Leslie Hope – Teri Bauer[2]
• Elisha Cuthbert – Kim Bauer[3]

• Sarah Clarke – Nina Myers[4]
• Carlos Bernard – Tony Almeida[5]
• Karina Arroyave – Jamey Farrell[6]
• Eric Balfour – Milo Pressman[7]
• Michael O'Neill – Richard Walsh[8]
• Scott Denny – Scott Baylor[9]
• Xander Berkeley – George Mason[10]
• Tamara Tunie – Alberta Green
• Paul Schulze – Ryan Chappelle[11]
• Kevin Ramsey – Ted Paulson
• Kirk Baltz – Teddy Hanlin
• Sam Ayers – Jeff Breeher

• Dennis Haysbert – David Palmer[12]
• Penny Johnson Jerald – Sherry Palmer[13]
• Megalyn Echikunwoke – Nicole Palmer[14]
• Vicellous Reon Shannon – Keith Palmer
• Jude Ciccolella – Mike Novick[15]
• Tanya Wright – Patty Brooks
• Kara Zediker – Elizabeth Nash
• Zach Grenier – Carl Webb
• Glenn Morshower – Aaron Pierce[16]
• Greg Hartigan – Secret Service Agent Berkin
• Jesse D. Goins – Secret Service Agent Alan Hayes
• Michael Bryan French – Secret Service Agent Frank Simes

• Devika Parikh – Maureen Kingsley
• John Prosky – George Ferragamo
• Ivar Brogger – Frank Ames

• Michael Massee — Ira Gaines[17]
• Daniel Bess — Rick Allen
• Matthew Carey — Dan Mounts
• Richard Burgi — Kevin Carroll
• Rudolf Martin — Jonathan Matijevich
• Mia Kirshner — Mandy[18]
• Silas Weir Mitchell – Eli Stram
• John Hawkes — Greg Penticoff
• Kim Murphy — Bridgit
• Al Leong — Neill Choi
• Jesse Corti — Charles McLemore

• Dennis Hopper — Victor Drazen
• Željko Ivanek — Andre Drazen
• Misha Collins — Alexis Drazen
• Henri Lubatti — Jovan Myovic
• Currie Graham — Ted Cofell

• Edoardo Ballerini — Frank Allard
• Navi Rawat — Melanie

• Wade Andrew Williams — Robert Ellis
• Jacqui Maxwell — Janet York
• Lou Diamond Phillips — Mark DeSalvo
• Kathleen Wilhoite — Lauren Proctor
• Pauley Perrette — Tanya
• Jason Matthew Smith — Chris
• Rudolf Martin — Martin Belkin
• Keram Malicki-Sánchez — Larry Rogow
• John Cothran, Jr. — Srgt. Kiley
• David Barrera — Officer Phillips
• Tony Perez — Srgt. Douglas Newman
• Kim Miyori — Dr. Susan Y. Collier
• Judith Scott — Dr. Rose M. Kent

• Kiefer Sutherland — Jack Bauer[1]
• Xander Berkeley — George Mason[10]
• Carlos Bernard — Tony Almeida[5]
• Reiko Aylesworth — Michelle Dessler[19]
• Paul Schulze — Ryan Chappelle[11]
• Randle Mell — Brad Hammond (CTU Division Supervisor)
• Sara Gilbert — Paula Schaeffer
• Lourdes Benedicto — Carrie Turner
• Donnie Keshawarz — Yusuf Auda
• Daniel Dae Kim — Tom Baker
• John Eddins — Agent Richards
• Donzaleigh Abernathy — Barbara Maccabee
• Michael Cudlitz — Rick Phillips

• Dennis Haysbert — President David Palmer[12]
• Penny Johnson Jerald — Sherry Palmer[13]
• Vicellous Reon Shannon — Keith Palmer
• Jude Ciccolella — Mike Novick[15]
• Glenn Morshower — Aaron Pierce[16]
• Timothy Carhart — Eric Rayburn
• Harris Yulin — Roger Stanton
• Michelle Forbes — Lynne Kresge
• Alan Dale — Vice President James Prescott
• Steven Culp — Ted Simmons
• John Rubinstein — Alex (Secretary of State)
• Robert Pine — Secretary of Agriculture
• Dean Norris — General Bowden
• Terry Bozeman — Richard Armus
• Tamlyn Tomita — Jenny Dodge (Press Secretary)
• Richard Holden — General Stone
• Greg Hartigan — Secret Service Agent Berkin

• Elisha Cuthbert — Kim Bauer
• Billy Burke — Gary Matheson
• Tracy Middendorf — Carla Matheson
• Skye McCole Bartusiak — Megan Matheson
• Kevin Dillon — Lonnie McRae
• Innis Casey — Miguel
• Michael McGrady — Officer Raymond Brown
• Miguel Perez — Ranger Mike Kramer
• Victor Rivers — Officer Amis
• Jamison Jones — Deputy Nirman
• Sterling Macer, Jr. — Deputy Raynes
• Susan Gibney — Anna
• Lombardo Boyar — Ramon Garcia
• Brent Sexton — Frank Davies

• Alexander Zale — Ambassador Shareef
• Christopher Maher — Deputy Prime Minister Barghouti
• Nicholas Guilak — Farhad Salim

• John Terry — Bob Warner
• Sarah Wynter — Kate Warner
• Laura Harris — Marie Warner
• Phillip Rhys — Reza Naiyeer
• Yareli Arizmendi — Karima Naiyeer
• Shaun Duke — Hasan Naiyeer

• Sarah Clarke — Nina Myers[4]
• Gregg Henry — Jonathan Wallace

• Jon Gries — Joseph Wald
• Douglas O'Keeffe — Eddie Grant
• Gregory Sporleder — Dave
• Jimmi Simpson — Chris

• Francesco Quinn — Syed Ali
• Anthony Azizi — Mamud Rasheed Faheen
• Shaheen Vaaz — Syed Ali's wife
• Ike Bram — Fareed Ali
• Raja Jean Fenske — Asad Ali
• Aki Avni — Mohsen
• Maz Jobrani — Marko Khatami
• Marc Casabani — Omar
• Fred Toma — Basheer

• Tobin Bell — Peter Kingsley
• Thomas Kretschmann — Max
• Eugene Robert Glazer — Alexander Trepkos
• Mia Kirshner — Mandy[18]
• Nina Landey — Eve
• Rick D. Wasserman — Alex Hewitt
• Peter Outerbridge — Ronnie Stark
• Brian Goodman — Raymond O'Hara
• Jeff Wincott — Davis
• Mark Ivanir — Trask

• Scott Allan Campbell — Dr. Porter (Field medic at warehouse, diagnoses George Mason)
• Sal Landi — Sgt. Arroyo (LAPD officer at warehouse)
• Christopher Murray — FBI Agent Dockerty (Agent at airfield)

• Antonio David Lyons — Cam Strocker (Telephone Repairman taken hostage)
• Peter Gregory — Dr. Spire (Doctor at medical center)
• Bernard White — Al-Fulani (Imam)
• Justin Louis — Danny Dessler (Michelle Dessler's brother)
• Jeff Wincott – Davis (kidnaps and tortures Jack)
• Eric Christian Olsen — John Mason (George Mason's son)
• Jim Abele — Ralph Burton (Private Investigator who helps Kate Warner)
• Al Sapienza — Paul Koplin (Ralph Burton's boss)
• Michael Holden — Ron Wieland (Journalist; Held by the President)
• Michael Mantell — Steve Hillenburg (CIA Operative who aides Sherry Palmer)
• Michael James Reed — Foreman (Foreman for a construction crew that Marie Warner talks to)
• Nick Offerman — Marcus (Captures Kate Warner and assaulted Yusuf Auda)
• Raymond Cruz — Rouse (Captures Kate Warner and assaulted Yusuf Auda)
• Maurice Compte — Cole (Captures Kate Warner and assaulted Yusuf Auda)
• Carmen Argenziano — General Gratz

• Kiefer Sutherland — Jack Bauer[1]
• Elisha Cuthbert — Kim Bauer[3]
• Carlos Bernard — Tony Almeida[5]
• Reiko Aylesworth — Michelle Dessler[19]
• James Badge Dale — Chase Edmunds
• Jesse Borrego — Gael Ortega
• Mary Lynn Rajskub — Chloe O'Brian[20]
• Zachary Quinto — Adam Kaufman
• Paul Schulze — Ryan Chappelle[11]
• Randle Mell — Brad Hammond
• Daniel Dae Kim — Tom Baker
• Butch Klein — Darren Richards
• Jenette Goldstein — Rae Plachecki
• Carrie Kim — Jade Paik
• David Herman — Dalton Furrelle
• Ed Wasser — Jason Carasone
• Tony Wayne — Robin Powers
• Neal Matarazzo — D.J. Graves

• Dennis Haysbert — David Palmer[12] (President of the United States)
• Penny Johnson Jerald — Sherry Palmer[13](David's ex-wife)
• Glenn Morshower — Aaron Pierce[16] (The head of Palmer's Secret Service detail)
• D. B. Woodside — Wayne Palmer[21](David Palmer's Brother; Chief of Staff)
• Wendy Crewson — Anne Packard (Palmer's personal doctor; Palmer's girlfriend)
• Jamie McShane — Gerry Whitehorn (Palmer's press chief)
• Albert Hall — Alan Milliken (Major contributor to Palmer's campaign/Ally of his Presidency)
• Gina Torres — Julia Milliken (Wife of Alan Milliken)
• Alan Dale — Jim Prescott (Vice President of the United States)
• Conor O'Farrell — Ted Packard (Anne's ex-husband)
• Michael Cavanaugh — Joseph O'Laughlin (Secretary of Homeland Security)
• Greg Hartigan — Secret Service Agent Berkin
• Richard Holden — General Stone

• Paul Blackthorne — Stephen Saunders (Former soldier and MI6 agent; turned into terrorist; main villain)
• Greg Ellis — Michael Amador (Seller of biological weapon)
• Lothaire Bluteau — Marcus Alvers (arms dealer; sold the Cordilla Virus; assumed to have a past with Nina Myers)
• Salvator Xuereb — Arthur Rabens (one of Stephen Saunders' couriers, has biological weapon in L.A.)
• Alexandra Lydon — Jane Saunders (Daughter of Stephen Saunders)
• Joe D'Angerio — Osterlind (Saunders' assistant)
• Gabrielle Fitzpatrick — Diana White (lover of Steven Saunders; help fund Saunders' operation)

• Joaquim de Almeida — Ramon Salazar (Narco-terrorist; Head of the Salazar family)
• Vincent Laresca — Hector Salazar (Ramon's brother; Head of family in Ramon's absence)
• Vanessa Ferlito — Claudia Hernandez (Girlfriend of Hector)
• Josh Cruz — Oriol (Claudia's father)
• Julian Rodriguez — Sergio (Claudia's brother)
• Lorry Goldman — Douglas Shaye (Ramon's lawyer)
• Gino Montesinos — Eduardo (Henchman)
• Eduardo Garcia — Emilio (Henchman)
• Gonzalo Menendez — Pablo (Henchman)
• David Labiosa — David Gomez (Henchman)

• Riley Smith — Kyle Singer (First time "drug dealer")
• Ted Marcoux — Sam Singer (Kyle's unemployed father)
• Lucinda Jenney — Helen Singer (Kyle's mother)
• Agnes Bruckner — Linda (Kyle's girlfriend)
• Kett Turton — Tim (Kyle's best friend)

• Andrea Thompson — Dr. Nicole Duncan
• Christina Chang — Dr. Sunny Macer

• Paul Vincent O’Connor — Police Chief Hendrix
• Tony Todd — Detective Michael Norris (interrogates Julia Milliken)
• Simon Templeman — Trevor Tomlinson (Agent in MI6 office in LA; killed in gunship attack)
• Maria del Mar — Rachel Forrester
• Kevin Chapman — Kevin Mitchell

• Doug Savant — Craig Phillips (Head of Hotel security)
• Paris Tanaka — Maya
• Sue Jin Song — Annalie Kim
• Scott Klace — Danny
• Brigid Brannagh — Kathy McCartney

• Sarah Wynter — Kate Warner (Ex-girlfriend of Jack Bauer)
• Sarah Clarke — Nina Myers[4] (Terrorist; Former CTU agent)
• Geoff Pierson — John Keeler (Republican Presidential Candidate)
• Mark Rolston — Bruce Foxton (professional evidence retriever)
• Carlos Gómez — Luis Annicon (Prison Supervisor; one of Jack's companions in the one year operation that brought down Ramon Salazar)
• Kamala Lopez-Dawson — Theresa Ortega (Gael's wife)
• JF Pryor — Zack Porter (Drug-dealer)
• Jack Kehler — Kevin Kelly
• Matt Salinger — Mark Kanar
• Rick Garcia — Rick Garcia
• Patrick Fabian — William Cole
• Jenni Blong — Susan Cole

• Kiefer Sutherland — Jack Bauer[1] (Special Assistant to the Secretary of Defense)
• William Devane — James Heller[22](United States Secretary of Defense)
• Logan Marshall-Green — Richard Heller (James Heller's son)
• Kim Raver — Audrey Raines[23](James Heller's daughter; Jack Bauer's girlfriend; Senior Policy Assistant to Heller)
• James Frain — Paul Raines (Audrey's estranged husband)
• David Newsom — Scott Borman (Heller's aide)

• Carlos Bernard — Tony Almeida
• Reiko Aylesworth — Michelle Dessler
• Alberta Watson — Erin Driscoll
• Mary Lynn Rajskub — Chloe O'Brian[20]
• James Morrison — Bill Buchanan[24]
• Roger Cross — Curtis Manning[25]
• Lana Parrilla — Sarah Gavin
• Louis Lombardi — Edgar Stiles[26]
• Aisha Tyler — Marianne Taylor
• Robert Cicchini — Howard Bern
• Cameron Bancroft — Lee Castle
• Shawn Doyle — Ronnie Lobell
• Thomas Vincent Kelly — Marc Besson
• Butch Klein — Eric Richards
• Naomi Kirkpatrick — Meredith Atterson
• Brandon Barash — Brandon
• Shannon Becker — Allison Nichols
• Michael Bofshever — Dr. Mark Kaylis
• Gwendoline Yeo — Melissa Raab
• Alicia Coppola — Azara Nasir

• Arnold Vosloo — Habib Marwan
• Nestor Serrano — Navi Araz
• Shohreh Aghdashloo — Dina Araz
• Jonathan Ahdout — Behrooz Araz
• Ned Vaughn — Mitch Anderson
• Tony Plana — Omar
• Mia Kirshner — Mandy[18]
• Anil Kumar — Kalil Hasan
• Adam Alexi-Malle — Joseph Fayed
• Dagmara Dominczyk — Nicole
• John Thaddeus — Joseph "Joe" Prado
• Keith Szarabajka — Robert Morrison
• Kris Iyer — Sabir Ardakani
• Faran Tahir — Tomas Sherek
• Matt Gallini — Abdul Mahnesh
• Kiran Rao — Hikmat Palpatine

• Geoff Pierson — President John Keeler
• Chris Olivero — Kevin Keeler
• Gregory Itzin — Vice-President Charles Logan[27]
• Jude Ciccolella — Mike Novick[15]
• John Allen Nelson — Logan's Chief of Security Walt Cummings
• Glenn Morshower — Secret Service Agent Aaron Pierce[16]
• Dennis Haysbert — former President David Palmer[12]
• J. Patrick McCormack — Robert Franklin
• Patrick Kilpatrick — Secret Service Agent Dale Spalding
• Matt Salinger — Mark Kanar

• Robertson Dean — Henry Powell
• Bill Smitrovich — Gene McLennan
• Richard Marcus — Forbes
• Albie Selznick — John Reiss
• Tomas Arana — Dave Conlon
• Amin Nazemzadeh — Naji
• Omid Abtahi — Safa
• Christopher B. Duncan — Specter

• Tzi Ma — Cheng Zhi
• Peter Chin — Lee Jong
• François Chau — Koo Yin
• Ping Wu — Su Ming

• Lukas Haas — Andrew Paige
• Leighton Meester — Debbie Pendleton
• Angela Goethals — Maya Driscoll (Erin Driscoll's daughter)
• Roxanne Day — Jen Slater
• T. J. Thyne — Jason Girard
• Claudette Mink — Kelly Girard
• Evan Handler — David Weiss
• Tim Kelleher — Greg Merfield (Secret Service Agent)
• Lina Patel — Nabilla Al-Jamil
• Phyllis Lyons — Karen Pendleton
• Michael Benyaer — Naseem
• Hector Luis Bustamante — Dr. Martinez
• Rick Garcia — Rick Garcia

• Kiefer Sutherland — Jack Bauer[1]
• Elisha Cuthbert — Kim Bauer[3]
• Kim Raver — Audrey Raines[23]
• C. Thomas Howell — Barry Landes

• Mary Lynn Rajskub — Chloe O'Brian[20] (CTU agent) see also CTU / Division / Homeland Security
• Reiko Aylesworth — Michelle Dessler[19] (former CTU Division Deputy Director; Tony's wife)
• Carlos Bernard — Tony Almeida[5] (former CTU Director; Michelle's husband)

• James Morrison — Bill Buchanan[24](CTU Director/ CTU Division Director)
• Mary Lynn Rajskub — Chloe O'Brian[20] (CTU agent)
• Carlo Rota — Morris O'Brian[28] (Chloe O'Brian's ex-husband)
• Sean Astin — Lynn McGill (Division; takes over as CTU Director)
• Kim Raver — Audrey Raines[23] (DOD liaison for CTU)
• Louis Lombardi — Edgar Stiles[26](CTU agent)
• Roger Cross — Curtis Manning[25] (CTU agent; Head of Field Ops)
• Jayne Atkinson — Karen Hayes[29](Homeland Security official)
• Stephen Spinella — Miles Papazian (Hayes' assistant)
• Jonah Lotan — Spenser Wolff (CTU agent)
• Danielle Burgio — Carrie Bendis (CTU agent)
• Kate Mara — Shari Rothenberg (CTU agent)
• Martin A. Papazian — Rick Burke
• Thomas Vincent Kelly — Marc Besson
• Jenny Levine — Valerie Harris
• Peter Asle Holden — Harry Swinton (CTU security guard)
• Carl Edwards — Jim Hill (Homeland Security official)
• Josie Di Vincenzo — CTU Agent Mara Tyler
• David Joyner — CTU S.W.A.T Agent Jones
• Michael Roddy — CTU S.W.A.T Agent Smith
• Tony Wayne — Robin Powers
• Alex Castillo — CTU Guard Hugo
• Marci Michelle — CTU Agent Marcy Reynolds
• Thomas Howell — CTU Guard Henry
• Billy Chamberlain — CTU Agent Fitzpatrick
• John McCain — CTU staffer

• Gregory Itzin — Charles Logan[27]
• Paul McCrane — Graem Bauer
• Peter Weller — Christopher Henderson
• Geraint Wyn Davies — James Nathanson
• John Allen Nelson — Walt Cummings
• Jeff Kober — Conrad Haas
• Robert Rusler — Hank
• José Zúñiga — Joseph Malina
• Sky Soleil — John Stratton
• John Butox — Steve Miller
• Carl Gilliard — Ron Swanson

• Gregory Itzin — Charles Logan (President)[27]
• Jean Smart — Martha Logan (First Lady)[30]
• Ray Wise — Hal Gardner (Vice President)
• John Allen Nelson — Walt Cummings (Chief of Staff)
• Jude Ciccolella — Mike Novick (Senior advisor)[15]
• Glenn Morshower — Aaron Pierce (Secret Service)
• William Devane — James Heller (Secretary of Defense)[22]
• Sandrine Holt — Evelyn Martin (Martha's personal aide)
• Alla Korot — Suzanne Cummings (Walt's wife)
• Anita Finlay — Wendy Brown (White House aide)
• Robb Reesman — Dr. Hill (Martha's personal doctor)
• Taylor Nichols — Burke
• David McDivitt — White House staffer
• Tracy Howe — Secret Service Agent Justin Adams
• Jason Grutter — Secret Service Agent Doug Masters
• Tim Mikulecky — Secret Service Agent Mark Wexler

• Dennis Haysbert — David Palmer[12]
• D. B. Woodside — Wayne Palmer[21]

• Nick Jameson — Yuri Suvarov
• Kathleen Gati — Anya Suvarov

• Julian Sands — Vladimir Bierko
• Mark Sheppard — Ivan Erwich
• David Dayan Fisher — Anton Beresch
• Alex Kuznetsov — Ostroff
• Stana Katic — Collette Stenger
• Patrick Bauchau — Jacob Rossler
• Timothy Omundson — Polokoff
• Marat Oyvetsky — Viktor Grigorin
• Taras Los — Chevensky
• Robert Maffia — Andrei
• Timothy V. Murphy — Schaeffer
• Yorgo Constantine — Mikhail

• Tzi Ma — Cheng Zhi

• John G. Connolly — Sgt. Mike McLaren

• Connie Britton — Diane Huxley
• Brady Corbet — Derek Huxley
• Penny Balfour — Jenny McGill
• Henry Ian Cusick — Theo Stoller
• Matthew Boylan — Dwayne Thompkins
• Angela Sarafyan — Inessa Kovalevsky
• Skylar Roberge — Amy Martin
• JoBeth Williams — Miriam Henderson
• Pia Artesona — Joanna Tandy
• Channon Roe — Cal
• Andrew Hawkes — Scott Evans
• Tom Wright — Admiral Kirkland
• Jeremy Ray Valdez — Petty Officer Tim Rooney
• Eddie Mekka — Ned
• Rick Garcia — Rick Garcia

• Kiefer Sutherland — Jack Bauer[1]
• James Cromwell — Phillip Bauer
• Paul McCrane — Graem Bauer
• Rena Sofer — Marilyn Bauer
• Evan Ellingson — Josh Bauer
• Kim Raver — Audrey Raines[23]
• Mark Bramhall — Sam

• James Morrison — Bill Buchanan[24]
• Marisol Nichols — Nadia Yassir[31]
• Mary Lynn Rajskub — Chloe O'Brian[20]
• Carlo Rota — Morris O'Brian[28]
• Roger Cross — Curtis Manning[25]
• Eric Balfour — Milo Pressman[7]
• Rick Schroder — Mike Doyle
• Martin A. Papazian — Rick Burke
• Spencer Garrett — Ben Kram (supervisor from Division)
• James C. Victor — Hal Turner (CTU Agent)
• Robb Weller — CTU Field Agent
• Brian Silverman — CTU Field Agent
• Lauten Richard Metcalfe — CTU Agent Stan Shavers
• Lex Cassar — CTU Agent Ryan
• Merik Tadros — CTU Agent Jamal
• J. R. Bourne — CTU Agent Connell Johnson
• Tony Wayne — Robin Powers

• D. B. Woodside — Wayne Palmer[21] (President of the United States)
• Peter MacNicol — Tom Lennox[32](President Palmer's Chief of Staff)
• Jayne Atkinson — Karen Hayes[29] (National Security Advisor)
• Regina King — Sandra Palmer
• Powers Boothe — Noah Daniels[33] (Vice-President of the United States)
• Chad Lowe — Reed Pollock (Deputy Chief of Staff)
• Kari Matchett — Lisa Miller
• Bob Gunton — Ethan Kanin (Secretary of Defense)
• Michael Shanks — Mark Bishop (Lobbyist)
• Michael Reilly Burke — Bruce Carson
• Jim Holmes — Arthur Welton
• Ray Laska — Kevin Graves (Attorney General)
• D. C. Douglas — Blake Simon (President Palmer's Advisor)
• Matt McKenzie — Agent Hollister (Secret Service Agent)
• Andrea Grano — Ellen Price (President Palmer's press secretary)
• Jolene Kim — Melinda (President Palmer's assistant)
• Jamison Jones — Dan (Head of Secret Service)
• William Bumiller — Agent Lowry (Secret Service Agent)
• Matt Battaglia — Agent Jennings (Secret Service Agent)
• Ajay Mehta — Middle Eastern Ambassador
• Peter Iannone — Homeland Security Official
• Kurt Hueig — Homeland Security Official
• Myra Mawk — Homeland Security Official

• Tzi Ma — Cheng Zhi
• Ian Anthony Dale — Zhou Yong

• Adoni Maropis — Abu Fayed
• Rade Šerbedžija — General Dmitri Gredenko
• David Hunt — Darren McCarthy
• Kal Penn — Ahmed Amar
• Shaun Majumder — Hasan Numair
• Missy Cryder — Rita Brady
• Sam Kanater — General Mohmar Habib
• Steven Schub — Samir Hussain
• Dylan Kenin — Victor
• Patrick Sabongui — Nasir
• Said Faraj — Halil
• Sammy Sheik — Masheer
• Adrian R'Mante — Omar

• James Cromwell — Phillip Bauer
• Paul McCrane — Graem Bauer
• Maury Sterling — Kozelek Hacker
• Adrian Neil — Liddy

• Scott William Winters — Agent Samuels
• Al Faris — Salim
• Haaz Sleiman — Heydar

• John Noble — Anatoly Markov
• Nick Jameson — Yuri Suvarov
• Kathleen Gati — Anya Suvarov

• William Devane — James Heller[22]
• Glenn Morshower — Aaron Pierce
• Gregory Itzin — Charles Logan[27]
• Jean Smart — Martha Logan[30]
• Alexander Siddig — Hamri Al-Assad
• Harry Lennix — Walid Al-Rezani
• Raphael Sbarge — Ray Wallace
• Megan Gallagher — Jillian Wallace
• Michael Angarano — Scott Wallace
• Chris Kramer — Stuart Pressman
• Pat Healy — Marcus
• Eric Bruskotter — Stan
• Nancy Cartwright — Jeannie Tyler
• Devon Gummersall — Mark Hauser
• Scott Michael Campbell — Brady Hauser

• Kiefer Sutherland – Jack Bauer[1]
• Elisha Cuthbert – Kim Bauer
• Paul Wesley – Stephen (Kim's husband)
• Claire Geare – Teri (Kim's daughter)

• Jeffrey Nordling – Larry Moss (FBI Special Agent in Charge)
• Annie Wersching – Renee Walker (FBI Special Agent)
• Janeane Garofalo – Janis Gold (FBI Analyst)
• Rhys Coiro – Sean Hillinger (FBI Analyst)
• Ever Carradine – Erika (Computer Analyst)
• John Billingsley – Michael Latham (Security specialist)

• Powers Boothe – President Noah Daniels
• Cherry Jones – Allison Taylor (President of the United States of America)
• Colm Feore – Henry Taylor (First Gentleman)
• Sprague Grayden – Olivia Taylor (First Daughter)
• Eric Lively – Roger Taylor
• Cameron Daddo – Mitchell Hayworth (Vice President of the United States of America)[34]
• Peter MacNicol as Tom Lennox
• Bob Gunton – Ethan Kanin (White House Chief of Staff)
• Isaach De Bankolé – Prime Minister Ule Motobo
• Glenn Morshower – Aaron Pierce[16](Former Secret Service Agent)
• Warren Kole – Brian Gedge (Secret Service Agent)
• Mark Kiely – Edward Vossler (Secret Service Agent)
• Frank John Hughes – Tim Woods (Secretary of Homeland Security)
• Kurtwood Smith – Senator Blaine Mayer
• Gil Bellows – Frank Trammell (U.S. Embassy Official in Sengala)
• Ryan Cutrona – Admiral John Smith
• Christina Chang – Dr. Sunny Macer
• Mark Derwin – Joe Stevens (Secretary of State)
• Lesley Fera – Angela Nelson (Press Secretary)
• Sean Michael – Charles Solenz

• Kiefer Sutherland – Jack Bauer[1]
• Carlos Bernard – Tony Almeida[5]
• Mary Lynn Rajskub – Chloe O'Brian[20]
• James Morrison – Bill Buchanan[24]
• Carlo Rota – Morris O'Brian[28]

• Tony Todd – General Benjamin Juma (Leader of Coup in Sangala)
• Hakeem Kae-Kazim – Colonel Iké Dubaku
• Peter Wingfield – David Emerson
• Arjay Smith – Laurent Dubaku
• Mark Aiken – Nichols
• Dameon Clarke – Alan Tanner
• Maximiliano Hernández – Donnie Fox
• Nick Chinlund – Masters

• Jon Voight – Jonas Hodges
• Rory Cochrane – Greg Seaton[35]
• Chris Mulkey – Doug Knowles
• Michael Rodrick – Stokes
• Gabriel Casseus – Robert Galvez
• Sebastian Roché – John Quinn
• Eyal Podell – Ryan Burnett (Senator Mayer's Advisor who is in league with Starkwood)

• Will Patton – Alan Wilson
• Amy Price-Francis – Cara Bowden (operative disguised as Hodges' lawyer)

• Robert Carlyle – Carl Benton
• Tommy Flanagan – Gabriel Schector
• Kris Lemche – Chris Whitley
• Carly Pope – Samantha Roth (Roger Taylor's Girlfriend)
• Tonya Pinkins – Alama Motobo
• Andi Chapman – Rosa Donoso
• Enuka Okuma – Marika Donoso
• Omid Abtahi – Jibraan Al-Zarian
• Ravi Kapoor – Muhtadi Gohar
• Rafi Gavron – Hamid Al-Zarian
• Siyabulela Ramba – Willie
• Don McManus – Bob Peluso
• Mary Page Keller – Sarah

• Kiefer Sutherland — Jack Bauer
• Elisha Cuthbert — Kim Bauer
• Annie Wersching — Renee Walker
• Paul Wesley — Stephen
• Claire Geare — Teri

• Mykelti Williamson — Brian Hastings
• Mary Lynn Rajskub — Chloe O'Brian
• Freddie Prinze Jr. — Cole Ortiz
• Katee Sackhoff — Dana Walsh
• John Boyd — Arlo Glass
• Julian Morris — Owen
• Matthew Yang King (as Matt Yang King) — King
• Jamie Martz — Nate Burke
• Justin Alston — Beck

• Cherry Jones — President Allison Taylor
• Chris Diamantopoulos — Chief of Staff Rob Weiss
• Bob Gunton — Secretary of State Ethan Kanin
• Gregory Itzin — Former President Charles Logan
• Frank John Hughes — Tim Woods
• Reed Diamond — Jason Pillar
• Michael Gaston — General David Brucker
• Eriq La Salle — UN Secretary General
• Lesley Fera  — Angela Nelson
• Merle Dandridge — Kristen Smith
• Julie Claire — Eden Linley
• Michael Irby — Adrion Bishop
• Christina Cox — Molly O'Connor
• Kathryn Winslow — Ellen Kramer
• Chris McGarry — Frank Haynum
• Sarah Hollis  — Susan

• Anil Kapoor — President Omar Hassan
• Necar Zadegan — Dalia Hassan
• Nazneen Contractor — Kayla Hassan
• Akbar Kurtha — Farhad Hassan
• T. J. Ramini — Tarin Faroush
• Mido Hamada — Samir Mehran
• Rami Malek — Marcos Al-Zacar
• Hrach Titizian — Nabeel
• Navid Negahban — Jamot
• Ethan Rains — Ali
• Rizwan Manji — Ahman

• Jürgen Prochnow — Sergei Bazhaev
• David Anders — Josef Bazhaev
• Gene Farber — Oleg Bazhaev
• Callum Keith Rennie — Vladimir Laitanan
• Doug Hutchison — Davros
• Jordan Marder — Dimitri
• Jon Sklaroff — Ziya Dakhilov
• Tony Curran — Lugo Elson

• Nick Jameson — President Yuri Suvarov
• Graham McTavish — Mikhail Novakovich
• Joel Bissonnette — Pavel Tokarev

• Benito Martinez — Victor Aruz
• Clayne Crawford — Kevin Wade
• Jennifer Westfeldt — Meredith Reed
• Michael Filipowich — Nick Coughlin
• Mare Winningham — Elaine Al-Zacar
• Stephen Root — Bill Prady
• D. B. Sweeney — Mark Bledsoe
• Michael Madsen — Jim Ricker
• Joe Nieves — NYPD Officer James "Jim" Koernig
• Sandra Purpuro — Maggie Koernig
• Domenick Lombardozzi — NYPD Officer John Mazoni
• Johnny Wu — NYPD Officer Philip Lu
• Eli Goodman — Dr. Joel Levine
• Thomas Ryan — Gary Klausner
• Alex Carter — Nantz

• Kiefer Sutherland — Jack Bauer
• Branko Tomović — Belcheck

• Yvonne Strahovski — Kate Morgan
• Gbenga Akinnagbe — Erik Ritter
• Giles Matthey — Jordan Reed
• Benjamin Bratt — Steve Navarro
• Adam Sinclair — Gavin Leonard
• Christina Chong — Mariana

• William Devane — President James Heller
• Tate Donovan — Chief of Staff Mark Boudreau
• Kim Raver — Audrey Boudreau
• Ross McCall — Ron Clark
• Colin Salmon — General Coburn
• John Boyega — First Lieutenant Chris Tanner
• Duncan Pow — Captain Greg Denovo

• Stephen Fry — Prime Minister Alastair Davies
• Miranda Raison — Caroline Fowlds
• James Puddephatt — Ken

• Mary Lynn Rajskub — Chloe O'Brian
• Michael Wincott — Adrian Cross
• Joseph Millson — Derrick Yates
• Mandeep Dhillon — Chell
• Charles Furness — Pete

• Michelle Fairley — Margot Al-Harazi
• Emily Berrington — Simone Al-Harazi
• Liam Garrigan — Ian Al-Harazi
• Sacha Dhawan — Naveed Shabazz

• Stanley Townsend — Anatol Stolnavich

• Tzi Ma — Cheng Zhi
• Alex Lanipekun — James Harman
• Tamer Hassan — Aron Bashir/Basher