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. – Sgt. 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 Crider – 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

The following characters appeared in the television film 24: Redemption and the seventh season of the series.

• 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