List of 24 characters
Appearance
The following is a list of characters in the television series 24. It includes some relatively minor characters not considered part of the main cast, and "bad guys". It is not, however, a complete list.
The list first names the actor, followed by the character and a brief description.
Some characters have their own pages; see the box below.
Season One
The Bauers
CTU / Division
- Sarah Clarke — Nina Myers
- Carlos Bernard — Tony Almeida
- Karina Arroyave — Jamey Farrell
- Eric Balfour — Milo Pressman
- Michael O'Neill — Richard Walsh
- Scott Denny — Scott Baylor
- Xander Berkeley — George Mason
- Tamara Tunie — Alberta Green
- Paul Schulze — Ryan Chappelle
- Kevin Ramsey — Agent Ted Paulson
- Kirk Baltz — Teddy Hanlin
Palmer's family and staff
- Dennis Haysbert — David Palmer
- Penny Johnson Jerald — Sherry Palmer
- Megalyn Echikunwoke — Nicole Palmer
- Vicellous Reon Shannon — Keith Palmer
- Jude Ciccolella — Mike Novick
- Tanya Wright — Patty Brooks
- Kara Zediker — Elizabeth Nash
- Zach Grenier — Carl Webb
- Glenn Morshower — Aaron Pierce
Other associates of Palmer
- Devika Parikh — Maureen Kingsley
- John Prosky — Dr. George Ferragamo
First assassination plot
- Michael Massee - Ira Gaines
- Daniel Bess - Rick Allen
- Matthew Carey - Dan Mounts
- Richard Burgi - Kevin Carroll
- Rudolf Martin - Jonathan/Martin Belkin
- Mia Kirshner - Mandy
- Kim Murphy - Bridgit
- Silas Weir Mitchell - Eli Stram
- John Hawkes - Greg Penticoff
Drazen's family and associates
- Dennis Hopper — Victor Drazen
- Zeljko Ivanek — Andre Drazen
- Misha Collins — Alexis Drazen
- Henri Lubatti — Jovan Myovic
- Currie Graham — Ted Cofell
- David Franco — Alan Morgan (Sabotør)
- Eugene Lazarev — Nikola (ven af Drazen familien)
- Juliette Dudnick — Mila (Nikola's daughter)
Rick's friends (outside the plot)
- Navi Rawat — Melanie
- Edoardo Ballerini — Frank Allard
Miscellaneous
- Kathleen Wilhoite — Lauren Proctor
- Christine Avila — Erica Vasquez
- Pauley Perrette — Tanya
- Vincent Angell — Dr. Phil Parslow
- Jason Matthew Smith — Chris
- Wade Andrew Williams — Robert Ellis
- Lou Diamond Phillips — Mark DeSalvo
- Gary Murphy — Vincent O'Brian (Kim's ex-boyfriend)
- Jacqui Maxwell - Janet York
Season Two
CTU / Division
- Kiefer Sutherland — Jack Bauer
- Xander Berkeley — George Mason
- Carlos Bernard — Tony Almeida
- Reiko Aylesworth — Michelle Dessler
- Paul Schulze — Ryan Chappelle
- Randle Mell — Brad Hammond (CTU Division Superviser)
- Sara Gilbert — Paula Schaeffer
- Lourdes Benedicto — Carrie Turner
- Donnie Keshawarz — Yusuf Auda
- John Eddins — Agent Richards (CTU agent)
- Donzaleigh Abernathy — Assistant to Agent Richards (CTU agent; hjalp Richards)
- Michael Cudlitz — Rick Phillips (CTU agent; Accompanies Jack with Nina Myers - Plane)
- Bryan Rasmussen — Ed Miller (CTU agent; Accompanies Jack with Nina Myers - Truck)
- Daniel Dae Kim — Tom Baker (CTU agent)
- Val Lauren — Randy Murdock (CTU agent; Imaging expert)
- Max Martini — Steve Goodrich (CTU agent; Meets Jack at Norton Airfield)
- Neal Matarazzo — Graves (CTU agent; Field Ops)
- Commodore James — Gibson (CTU agent; Audio expert)
- Dylan Haggerty — NEST Technician #1 (Technician who looks at nuke)
Palmer's family and administration
- Dennis Haysbert — David Palmer
- Penny Johnson Jerald — Sherry Palmer
- Vicellous Reon Shannon — Keith Palmer
- Jude Ciccolella — Mike Novick
- Glenn Morshower — Aaron Pierce
- Timothy Carhart — Eric Rayburn (Deputy Director of the NSA)
- Michelle Forbes — Lynne Kresge
- Tamlyn Tomita — Jenny Dodge
- Terry Bozeman — Richard Armus (Secret Service Agent)
- Harris Yulin — Roger Stanton
- Steven Culp — Ted Simmons
- Dean Norris — General Bowden (Senior Military Adviser; Joint Chiefs of Staff)
- Alan Dale — Vice President Jim Prescott
- Austin Tichenor — Secretary of Treasury
- John Rubinstein — Secretary of State (Casts the deciding vote to invoke the 25th Amendment)
- Robert Pine — Secretary of Agriculture
Kim Bauer storyline
- Elisha Cuthbert — Kimberly Bauer
- Billy Burke — Gary Matheson
- Tracy Middendorf — Carla Matheson
- Skye McCole Bartusiak — Megan Matheson
- Innis Casey — Miguel
- Kevin Dillon — Lonnie McRae
- Michael McGrady — Officer Brown (Arresterede Miguel, Kim, og Megan)
- Shaheen Vaaz — Ranger Mike Kramer (Checks in at Lonnie's cabin looking for Kim)
- Victor Rivers — Officer Amis (Desk Sergeant at Santa Carlita Police Station)
- Jamison Jones — Deputy Nirman (Officer in charge at store)
- Sterling Macer Jr — Deputy Raynes (Arrests Kim Bauer at store)
- Susan Gibney — Anna (Motorist who gives Kim Bauer a lift)
- Lombardo Boyar — Ramon Garcia (Holds up convenience store)
- Brent Sexton — Frank Davies (Convenience Store owner)
Foreign diplomats
- Alexander Zale — Ambassador Shareef (Ambassador for a Middle Eastern state)
- Christopher Maher — Deputy Prime Minister Barghouti (Deputy Prime Minister for a Middle Eastern state)
- Nico Guilak — Salim (Attache for Middle Eastern state)
The Warners and the Naiyeers
- John Terry — Bob Warner
- Sarah Wynter — Kate Warner
- Laura Harris — Marie Warner
- Phillip Rhys — Reza Naiyeer
- Shaun Duke — Mr. Naiyeer (Reza's Father)
- Yareli Arizmendi — Mrs. Naiyeer (Reza's Mother)
Traitors involved in terrorist plot
- Sarah Clarke — Nina Myers (Former CTU agent; Prisoner; Terrorist aid)
- Gregg Henry — Captain Jonathan Wallace (Member of Coral Snake team)
Wald's crew
- Jon Gries — Joseph Wald (Boss of Crew that Bombs CTU)
- Douglas O'Keeffe — Eddie Grant (Works for Joseph Wald)
- Gregory Sporleder — Dave (Part of Grant's Crew)
- Jimmi Simpson — Chris (Part of Grant's Crew)
Ali's family and second wave
- Francesco Quinn — Syed Ali (Terrorist leader)
- Anthony Azizi — Mamud Faheen (Suspected by Nina Myers of knowing location of nuke)
- Shaheen Vaaz — Mrs. Ali (Married to Syed Ali)
- Ike Bram — Fareed Ali (Young son of Syed Ali)
- Raja Fenske — Asad Ali (Young son of Syed Ali)
- Aki Avni — Moshen (Aids Ali in torturing Paul Koplin)
- Anthony Azizi — Marko Khatami (Part of 3 man group that transported nuke to airfield)
- Marc Casabani — Omar (Part of 3 man group that transported nuke to airfield)
- Fred Toma — Basheer (Part of 3 man group that transported nuke to airfield)
- Nick Offerman — Marcus (Captures Kate Warner #1)
- Raymond Cruz — Rouse (Captures Kate Warner #2)
Peter Kingsley Group
- Tobin Bell — Peter Kingsley (Businessman; main villain of Season 2)
- Mia Kirshner — Mandy (Assassin from Season 1 returns)
- Nina Landey — Eve (Assistant to Peter Kingsley)
- Rick D. Wasserman — Alex Hewitt (Fabricated the Cyprus audio tapes)
- Thomas Kretschmann — Max (Financier and possible boss of Kingsley; hired Mandy)
- Peter Outerbridge — Ronnie Stark (Part of Kingsley's group that tortures Jack; #1)
- Brian Goodman — Raymond O'Hara (Part of Kingsley's group that tortures Jack; #2)
- Eugene Robert Glazer — Alexander Trepkos (Intermediary between Max and Kingsley)
Miscellaneous Feds/ Police / Medical
- Scott Allan Campbell — Dr. Porter (Field medic at warehouse, diagnoses George Mason)
- Sal Landi — Sgt. Arroyo (LAPD officer at warehouse)
- Christopher Murray — FBI Agent Dockery (Agent at airfield)
Miscellaneous characters
- Antonio David Lyons — Cam Strocker (Telephone Repairman taken hostage)
- Justin Louis — Dr. Spire (Doctor at medical center)
- Bernard White — Al Fulani (Owner of Mosque)
- Justin Louis — Danny Dessler (Michelle Dessler's Brother)
- Eric Christian Olsen — John Mason (George Mason's only 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)
- James Michael Reed — Foreman (Foreman for a construction crew that Marie Warner talks to)
Season Three
CTU / Division
- Kiefer Sutherland — Jack Bauer (CTU agent; Field ops; temporary CTU director)
- Carlos Bernard — Tony Almeida (CTU Director, Michelle Dessler's Husband)
- Reiko Aylesworth — Michelle Dessler (CTU agent; #2 in charge; Tony Almeida's wife)
- Elisha Cuthbert — Kimberly Bauer (CTU agent; Jack's daughter)
- James Badge Dale — Chase Edmunds (CTU agent; Field ops; Jack Bauer's partner; Kim's boyfriend)
- Jesse Borrego — Gael Ortega (CTU agent)
- Mary Lynn Rajskub — Chloe O'Brian (CTU programmer)
- Zachary Quinto — Adam Kaufman (CTU agent)
- Paul Schulze — Ryan Chappelle (CTU Division Director)
- David Herman — Dalton Furrelle (CTU technician)
- Randle Mell — Brad Hammond (CTU Division Superviser)
- Daniel Dae Kim — Tom Baker (CTU agent; Field ops)
- Butch Klein — Darren Richards (CTU interrogator; tortures Nina)
- Jenette Goldstein — Rae Plachecki (Division agent; interviews Jack and later Tony)
- Carrie Kim — Jade Paik (CTU Division Secretary)
Palmer's family and administration and associates
- Dennis Haysbert — David Palmer (President of the United States)
- Penny Johnson Jerald — Sherry Palmer (David's ex-wife)
- Glenn Morshower — Aaron Pierce (The head of Palmer's Secret Service detail)
- DB Woodside — Wayne Palmer (David Palmer's Brother; Chief of Staff)
- Wendy Crewson — Dr. Anne Packard (Palmer's personal doctor; Palmer's girlfriend)
- Conor O'Farrell — Ted Packard (Anne's ex-husband)
- 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)
- Michael Cavanaugh — Joseph O'Laughlin (Director of Homeland Security)
- Melony Harrison — Erin Palmer Wayne Palmer's Wife
Salazar family and associates
- 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 (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)
Singer family and associates
- 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)
- Darin Cooper — Don (the Singer's landlord)
Saunder's family and crew
- Paul Blackthorne — Stephen Saunders (Former soldier and MI6 agent; Served with Jack in Kosovo (Operation Nightfall); presumed dead until Day 3; turned into terrorist; main villain)
- Greg Ellis — Michael Amador (Seller of biological weapon)
- Alexandra Lydon — Jane Saunders (Daughter of Stephen Saunders)
- Salvator Xuereb — Arthur Rabens (one of Stephen Saunders' couriers, has biological weapon in L.A.)
- Lothaire Bluteau — Marcus Alvers (arms dealer; sold the Cordilla Virus; assumed to have a past with Nina Myers)
- Joe D’Angerio — Osterlind (Saunders' assistant)
- Gabrielle Fitzpatrick — Diana White (lover of Steven Saunders; help fund Saunders' operation)
National Health Services
- Andrea Thompson — Dr. Nicole Duncan
- Christina Chang— Dr. Sunny Macer
Miscellaneous police / Feds / Medical
- Paul Vincent O’Connor — Police Chief Hendrix
- Tony Todd — Detective Michael Norris (interrogates Julia Milliken)
- Simon Templeman — Trevor Tomlinson (Agent in MI5 office in LA; killed in gunship attack)
Chandler Plaza Hotel staff and guests
- Doug Savant — Craig Phillips (Head of Hotel security)
- Paris Tanaka — Maya
- Sue Jin Song — Annalie Kim
- Scott Klace — Irate Hotel Guest
Miscellaneous characters
- Sarah Wynter — Kate Warner (Ex-girlfriend of Jack Bauer)
- Sarah Clarke — Nina Myers (Terrorist; Former CTU agent)
- Geoff Pierson — Senator John Keeler (Republican Presidential Candidate)
- Carlos Gomez — 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)
Season Four
Department of Defense / Heller's family
- Kiefer Sutherland — Jack Bauer (Special Assistant to the Secretary of Defense)
- William Devane — James Heller (United States Secretary of Defense)
- Kim Raver — Audrey Heller Raines (James Heller's daughter; Jack Bauer's girlfriend; Senior Policy Assistant to Heller)
- Logan Marshall-Green — Richard Heller (James Heller's son)
- James Frain — Paul Raines (Audrey's separated husband)
- David Newsom — Scott Borman (Heller's aide)
CTU / Division
- Alberta Watson — Erin Driscoll (CTU Director)
- Reiko Aylesworth — Michelle Dessler (CTU Division Deputy Director; CTU Los Angeles Branch Acting Director; Tony's ex-wife)
- Carlos Bernard — Tony Almeida (former CTU agent, re-instated to CTU on a provisional basis)
- James Morrison — Bill Buchanan (CTU Division Director; formerly involved with Michelle)
- Mary Lynn Rajskub — Chloe O'Brian (CTU agent; Senior Analyst)
- Roger Cross — Curtis Manning (CTU agent; Head of Tactical)
- Lana Parrilla — Sarah Gavin (CTU agent)
- Louis Lombardi — Edgar Stiles (CTU agent)
- Marie Knolls — Samantha Caines (CTU analyst)
- Aisha Tyler — Marianne Taylor (consultant for CTU; discovered as being a mole in 2:00pm-3:00pm)
- Shannon Becker — Allison Nichols (escorted Michelle Dessler into CTU and helped her take control)
- Shawn Doyle — Ronnie Lobell (CTU agent; Head of Field ops)
- Cameron Bancroft — Agent Lee Castle (CTU agent; Tactical team)
- Butch Klein — Darren Richards (CTU chief interrogator; tortures Richard Heller and Sarah Gavin)
- Thomas Vincent Kelly — Dr. Marc Benson (CTU doctor who treats Paul Raines and Lee Jong)
- Naomi Kirkpatrick — Meredith Atterson (CTU Security Executive, helped Curtis place Marianne Taylor into custody)
Terrorist group
- Arnold Vosloo — Habib Marwan (leader of the terrorist plot; main villain)
- Nestor Serrano — Navi Araz (key terrorist)
- Shohreh Aghdashloo — Dina Araz (his wife)
- Jonathan Ahdout — Behrooz Araz (their son)
- Anil Kumar — Kalil Hasan (henchman)
- Tony Plana — Omar (in command at the compound; kidnapper of Secretary Heller)
- Adam Alexi-Malle — Joseph Fayed (Terrorist cell member; delivers Dina Araz and Jack Bauer to Marwan)
- Ned Vaughn — Captain Mitch Anderson (former American military officer; fires on Air Force One)
- Dagmara Dominczyk — Nicole (hired mercenary working with Anderson; posed as an American pilot's girlfriend, then as an FBI agent)
- John Thaddeus — Joe Prado (mercenary illegally tortured by Jack)
- Keith Szarabajka — Robert Morrison (associate of Marwan's supervising the assembly of the nuclear missile)
- Kris Iyer — Sabir Ardakani (engineer working on the missile)
- Mia Kirshner — Mandy (Assassin from Season 1 and 2 returns, takes Tony hostage)
Keeler's family and administration
- Geoff Pierson — John Keeler (President of the United States)
- J. Patrick McCormack — Robert Franklin (aide to the President)
- Chris Olivero — Kevin Keeler (John Keeler's son)
- Gregory Itzin — Charles Logan (Vice-President of the United States/Acting President)
- Jude Ciccolella — Mike Novick (Logan's senior advisor)
- John Allen Nelson — Walt Cummings (Logan's head of security)
- Glenn Morshower — Agent Aaron Pierce (Secret Service agent)
- Dennis Haysbert — David Palmer (Former President of the United States/Special Advisor to President Logan)
- Patrick Kilpatrick — Dale Spalding (Secret service agent sent by Cummings who "kills" Jack)
- Felicity Paetzold — Blakeney (Secretary for John Keeler)
McLennan-Forster storyline
- Robertson Dean — Henry Powell (Marianne's contact)
- Bill Smitrovich — Gene McLennan (CEO of McLennan-Forster)
- Richard Marcus — Forbes (McLennan-Forster henchman; kills Marianne and captures Curtis)
- Albie Selznick — John Reiss (McLennan-Forster CFO; orders EMP device activated)
- Tomas Arana — Dave Conlon (Head of security for McLennan-Forster)
- Amin Nazemzadeh — Naji (Arab-American; brother of Safa; defends his store along with Jack and Paul)
- Omid Abtahi — Safa (Arab-American; brother of Naji; defends his store along with Jack and Paul)
Chinese Consulate
- Peter Chin — Lee Jong (former research scientist working for Marwan; takes refuge at the consulate)
- François Chau — Koo Yin (Chinese Consul in Los Angeles)
- Ping Wu — Su Ming (Chinese Deputy Consul; accuses Palmer's people of infiltrating the embassy to get to Lee)
- Tzi Ma — Cheng Zhi (Chief of Security for the consul; questions several CTU employees)
Miscellaneous characters
- Lukas Haas — Andrew Paige (Computer programmer; friend of Chloe O'Brian)
- Debbie Pendleton (Behrooz Araz's American girlfriend)
- Angela Goethals — Maya Driscoll (Daughter of Erin Driscoll)
- Roxanne Day — Jen Slater (Tony's girlfriend)
- T.J. Thyne — Jason Girard (Camper who finds the "football"; husband of Kelly)
- Claudette Mink — Kelly Girard (Camper who finds the "football"; wife of Jason)
- Evan Handler — David Weiss (Attorney from Amnesty Global who demands Joe Prado's release)
- Tim Kelleher — Greg Merfield (Secret service agent sent to arrest Jack)
- Lina Patel — Nabilla (Girlfriend of Sabir; suspects her boyfriend may be involved with terrorists)
- Phyllis Lyons — Karen Pendleton (Debbie's mother)
- Michael Benyaer — Naseem (Dina's brother; unaware of the terrorist plot)
Season Five
Bauer's family and associates
- Kiefer Sutherland — Jack Bauer (former CTU agent; presumed dead; alias Frank Flynn; occasionally works at the local oil field)
- Connie Britton — Diane Huxley (Owner of the house where Jack rents a room)
- Brady Corbet — Derek Huxley (Diane's son)
- Elisha Cuthbert — Kim Bauer (former CTU agent; Jack's daughter)
- C. Thomas Howell — Barry Landes (Kim Bauer's therapist and current boyfriend)
Jack's Inner Circle
- Mary Lynn Rajskub — Chloe O'Brian (CTU agent) see also CTU / Division / Homeland Security
- Reiko Aylesworth — Michelle Dessler (former CTU Division Deputy Director; Tony's wife)
- Carlos Bernard — Tony Almeida (former CTU agent; Michelle's husband)
CTU / Division / Homeland Security
- James Morrison — Bill Buchanan (CTU Director)
- Mary Lynn Rajskub — Chloe O'Brian (CTU agent)
- Sean Astin — Lynn McGill (Division; takes over as CTU Director)
- Kim Raver — Audrey Raines (DOD liaison for CTU)
- Louis Lombardi — Edgar Stiles (CTU agent)
- Roger Cross — Curtis Manning (CTU agent; Head of Field Ops)
- Jonah Lotan — Spenser Wolff (CTU agent)
- Danielle Burgio — Carrie Bendis (CTU agent)
- Kate Mara — Shari Rothenberg (CTU agent)
- Tracie Dominguez — Phyllis Jecille (CTU analyst, survived the nerve gas attack)
- Martin Papazian — Rick Burke (CTU interrogator)
- Thomas Vincent Kelly — Dr. Marc Benson (CTU doctor)
- Fran Steel — Vivian Crenzler (CTU employee, survived the gas attack)
- Peter Asle Holden — Harry Swinton (CTU security guard)
- Jayne Atkinson — Karen Hayes (Homeland Security official)
- Stephen Spinella — Miles Papazian (Hayes' assistant)
- Carl Edwards — James Hill (Homeland Security official)
- Jenny Levine — Valerie Harris (Homeland Security agent)
- Carlo Rota — Morris O'Brian (Chloe O'Brian's ex-husband)
- Josie Di Vincenzo — CTU Agent Mara
- David Joyner — CTU S.W.A.T Agent Jones
- Michael Roddy — CTU S.W.A.T Agent Smith
- Alex Castillo — CTU Guard Hugo
- Marci Michelle — CTU Agent Jackie
- Thomas Howell — CTU Guard Henry
- Billy Chamberlain — CTU Agent Fitzpatrick
Sentox Nerve Gas Conspiracy
- Gregory Itzin — Charles Logan (President of the United States; manipulator of the conspiracy; main antagonist)
- Paul McCrane — Graham (apparent mastermind)
- Peter Weller — Christopher Henderson (federal agent who recruited Jack; key conspirator)
- Geraint Wyn Davies — James Nathanson (middleman between Logan and Cummings)
- John Allen Nelson — Walt Cummings (Logan’s Chief of Staff; supposed scapegoat in the conspiracy)
- Jeff Kober — Haas (assassin who killed David Palmer)
- Robert Rusler — Hank (assassin sent to kill Jack)
White House officials, employees, and associates
- Jean Smart — Martha Logan (First Lady; Logan's wife)
- Ray Wise — Hal Gardner (President & Vice-President of the United States)
- Jude Ciccolella — Mike Novick (senior advisor and later Chief of Staff)
- Glenn Morshower — Agent Aaron Pierce (Secret Service agent)
- William Devane — James Heller (United States Secretary of Defense, Audrey Raines's father)
- Sandrine Holt — Evelyn Martin (Assistant to Martha Logan)
- Alla Korot — Suzanne Cummings (Walt Cumming's wife)
- Anita Finlay — Wendy Brown (Logan's Aide)
- Robb Reesman — Dr. Hill (Martha's doctor)
- David McDivitt — White House staffer
Palmer family
- Dennis Haysbert — David Palmer (Former President of the United States)
- DB Woodside — Wayne Palmer (David Palmer's Brother; Former White House Chief of Staff)
Russian Federation
- Nick Jameson — Yuri Suvarov (Russian President)
- Kathleen Gati — Anya Suvarov (Russian First Lady)
Russian separatists and collaborators
- Julian Sands — Vladimir Bierko (billionaire; separatist leader)
- Mark Sheppard — Ivan Erwich (chemical engineer; sleeper within the hostages)
- David Dayan Fisher — Anton Beresch (holds Ontario airport hostage)
- Timothy Omundson — Polokoff (terrorist; gasses a shopping mall)
- Marat Oyvetsky — Viktor Grigorin (terrorist; gasses Tyler Memorial Hospital)
- Alex Kuznetsov — Ostroff (terrorist; gasses CTU)
- Taras Los — Chevensky (contact at Ontario airport)
- Robert Maffia — Andrei (terrorist; member of Erwich's crew)
- Timothy V. Murphy — Schaeffer (Erwich's driver)
- Yorgo Constantine — Mikhael (Bierko henchman)
- Oleg Taktarov — Sergei Sratkin (separatist)
- Patrick Bauchau — Jacob Rossler (systems programmer; associate of Erwich)
- Stana Katic — Collette Stenger (information broker)
People's Republic of China
Miscellaneous Feds/Police/Medical
- John G. Connolly — Sgt. Mike McLaren
Miscellaneous characters
- Henry Ian Cusick — Theo Stoller (German intelligence agent involved with Collette)
- Penny Balfour — Jenny McGill (Lynn McGill's sister)
- Matthew Boylan — Dwayne Thompkins (Jenny McGill's boyfriend)
- Angela Sarafyan — Inessa Kovalevsky (Jacob Rossler's 15-year-old sex slave)
- Skylar Roberge — Amy Martin (Evelyn Martin's daughter)
- JoBeth Williams — Miriam Henderson (Christopher Henderson's wife)
- Pia Artesona — Joanne Tandy (Christopher Henderson's secretary)
- Channon Roe — Cal (autoshop worker forced to open Sentox canisters)
Season Six
Bauer's family and associates
- Kiefer Sutherland — Jack Bauer (Former CTU agent)
- James Cromwell — Phillip Bauer (Jack Bauer's Father)
- Kim Raver — Audrey Raines (Jack Bauer's Ex-Girlfriend)
CTU / Division / Homeland Security
- James Morrison — Bill Buchanan (CTU Director)
- Marisol Nichols — Nadia Yassir (CTU Second-in-Command)
- Mary Lynn Rajskub — Chloe O'Brian (CTU agent)
- Roger Cross — Curtis Manning (CTU agent; Head of Field Ops)
- Carlo Rota — Morris O'Brian (Chloe O'Brian's ex-husband and CTU Analyst)
- Eric Balfour — Milo Pressman (CTU Analyst)
- Rick Schroder as Mike Doyle (CTU Operative)
White House officials, employees, and associates
- DB Woodside — Wayne Palmer (President of the United States)
- Peter MacNicol — Thomas Lennox (Chief of Staff)
- Regina King — Sandra Palmer (Lawyer and Sister of Wayne Palmer)
- Powers Boothe — Noah Daniels (Vice-President)
- Glenn Morshower — Agent Aaron Pierce (Secret Service agent)
- Chad Lowe — Reed Pollock (A Savvy Political Operator)
- Jayne Atkinson — Karen Hayes (Special Advisor to the President)
People's Republic of China
Antagonists
- Alexander Siddig — Harim Al-Assad (Main Evildoer behind the Plot)
- David Hunt — Darren McCarthy (A Villanous Accomplice)
- Paul McCrane — Graham
- Rena Sofer — Marilyn (Graham's Wife)
- Evan Ellingson — Josh (Graham's Son)
- Steven Schub — Middle Eastern Terrorist
- Adoni Maropis — Abu Fayed
- Kal Penn — Ahmet
Miscellaneous characters
- Gregory Itzin — Charles Logan (Ex-President of the United States; Presumed to be In Jail)
- Jean Smart — Martha Logan (Logan's Ex-Wife)
- Michael Angarano — Scott (Boy Associated with main Plot)