Below is a list of Guest Characters by season. To find a specific character or cast member press ctrl+F or click on edit and find. Enter the name you want to find, then click search.
Season 1[]
- Rudolf Martin as Martin Belkin
- Kim Murphy as Bridgit
- Tanya Wright as Patty Brooks
- Currie Graham as Ted Cofell
- Lou Diamond Phillips as Mark DeSalvo
- Wade Andrew Williams as Robert Ellis
- John Prosky as Dr. George Ferragamo
- Edoardo Ballerini as Frank Allard
- Tamara Tunie as Alberta Green
- Kirk Baltz as Teddy Hanlin
- Devika Parikh as Maureen Kingsley
- Navi Rawat as Melanie
- Juliette Dudnick as Mila Luminovic
- Henri Lubatti as Jovan Myovic
- Kara Zediker as Elizabeth Nash
- Eugene Lazarev as Nikola Luminovic
- Vincent Angell as Dr. Phil Parslow
- Kevin Ramsey as Agent Ted Paulson
- Eric Balfour as Milo Pressman
- Kathleen Wilhoite as Lauren Proctor
- Silas Weir Mitchell as Eli Stram
- Pauley Perrette as Tanya
- Michael O'Neill as Richard Walsh
- Jacqui Maxwell as Janet York
Season 2[]
- Vicellous Shannon as Keith Palmer
- Jon Gries as Joseph Wald
- Randle Mell as Brad Hammond
- John Eddins as Agent Richards
- Donzaleigh Abernathy as Assistant to Agent Richards
- Michael Cudlitz as Agent Rick Phillips
- Bryan Rasmussen as Agent Ed Miller
- Sal Landi as Sgt. Arroyo
- Christopher Murray as FBI Agent Dockery
- Justin Louis as Danny Dessler
- Eric Christian Olsen as John Mason
- Jim Abele as Ralph Burton
- Al Sapienza as Paul Koplin
- Michael Holden as Ron Wieland
- Michael Mantell as Steve Hillenburg
- James Michael Reed as Foreman
- Val Lauren as Agent Randy Murdock
- Max Martini as Agent Steve Goodrich
- Neal Matarazzo as Agent Graves
- Commodore James as Agent Gibson
- Dylan Haggerty as NEST Technician #1
- Scott Allan Campbell as Dr. Porter
- Terry Bozeman as Richard Armus
- Steven Culp as Agent Ted Simmons
- Dean Norris as General Bowden
- Austin Tichenor as Secretary of Treasury
- John Rubinstein as Secretary of State
- Robert Pine as Secretary of Agriculture
- Alexander Zale as Ambassador Shareef
- Christopher Maher as Deputy Prime Minister Barghouti
- Nicholas Guilak as Farhad Salim
- Shaun Duke as Hassan Naiyeer
- Yareli Arizmendi as Rima Naiyeer
- Kevin Dillon as Lonnie McRae
- Michael McGrady as CHP Officer Brown
- Shaheen Vaaz as Ranger Mike Kramer
- Victor Rivers as Officer Amis
- Jamison Jones as Deputy Nirman
- Sterling Macer Jr as Deputy Raynes
- Susan Gibney as Anna
- Lombardo Boyar as Ramon Garcia
- Uncredited Actor as Frank Davies
- Donnie Keshawarz as Yusuf Auda
- Antonio David Lyons as Cam Strocker
- Justin Louis as Dr. Spire
- Bernard White as Imam Al Fulani
- Gregg Henry as Jonathan Wallace
- Anthony Azizi as Mamud Rashed Faheen
- Nick Offerman as Marcus
- Raymond Cruz as Rouse
- Douglas O'Keeffe as Eddie Grant
- Gregory Sporleder as Dave
- Jimmi Simpson as Chris
- Shaheen Vaaz as Mrs. Syed Ali
- Ike Bram as Fareed Ali
- Raja Fenske as Asad Ali
- Aki Avni as Moshen
- Marc Casabani as Omar
- Fred Toma as Basheer
- Tobin Bell as Peter Kingsley
- Mia Kirshner as Mandy
- Nina Landey as Eve
- Rick D. Wasserman as Alex Hewitt
- Thomas Kretschmann as Max
- Peter Outerbridge as Ronnie Stark
- Brian Goodman as Raymond O'Hara
- Eugene Robert Glazer as Alexander Trepkos
Season 3[]
- Marco Sanchez as Rafael Gutierrez
- David Herman as Dalton Furrelle
- Carlos Gomez as Luis Annicon
- Kamala Lopez-Dawson as Theresa Ortega
- Conor O'Farrell as Ted Packard
- Michael Cavanaugh as Joseph O'Laughlin
- Julian Rodriguez as Sergio
- Alexandra Lydon as Jane Saunders
- Salvator Xuereb as Arthur Rabens
- Butch Klein as Darren Richards
- Jenette Goldstein as Rae Plachecki
- Tony Todd as Detective Norris
- Doug Savant as Craig Phillips
- Paul Vincent O'Connor as Police Chief Hendrix
- JD Cullum as Bruce Margolis
- Brigid Brannagh as Kathy McCartney
- Patrick Fabian as William Cole
- Jenni Blong as Susan Cole
- Joe D'Angerio as Osterlind
- Shawn Woods as Frederick
- Kevin Fry as Kevin
- Jed Bernard as Barry (uncredited)
- Randy Thompson as Roger Sommers
Season 4[]
- Ned Vaughn as Mitch Anderson
- Shawn Doyle as Ronnie Lobell
- Lukas Haas as Andrew Paige
- Angela Goethals as Maya Driscoll
- Roxanne Day as Jen Slater
- T.J. Thyne as Jason Girard
- Claudette Mink as Kelly Girard
- Evan Handler as David Weiss
- Tim Kelleher as Greg Merfield
- Lina Patel as Nabilla Al-Jamil
- Assaf Cohen as Yassir
- David Newsom as Scott Borman
- Leighton Meester as Debbie Pendleton
- Phyllis Lyons as Karen Pendleton
- Michael Benyaer as Naseem
- Tony Plana as Omar (Day 4)
- Anil Kumar as Kalil Hasan
- Dagmara Dominczyk as Nicole
- John Thaddeus as Joe Prado
- Keith Szarabajka as Robert Morrison
- Kris Iyer as Sabir Ardakani
- J. Patrick McCormack as Robert Franklin
- Chris Olivero as Kevin Keeler
- Robertson Dean as Henry Powell
- Bill Smitrovich as Gene McLennan
- Richard Marcus as Forbes
- Albie Selznick as John Reiss
- Tomas Arana as Dave Conlon
- Amin Azemzadeh as Naji
- Omid Abtahi as Safa
- Tzi Ma as Cheng Zhi
- Peter Chin as Lee Jong
- Ping Wu as Su Ming
- Butch Klein as Eric Richards
- Anthony Azizi as Rafique
Season 5[]
- William Devane as Secretary of Defense James Heller
- Elisha Cuthbert as Kimberly Bauer
- Dennis Haysbert as David Palmer
- Reiko Aylesworth as Michelle Dessler
- Carl Edwards as Jim Hill
- C. Thomas Howell as Barry Landes
- Penny Balfour as Jenny McGill
- Jeff Kober as Haas
- David Dayan Fisher as Anton Beresch
- Patrick Bauchau as Jacob Rossler (uncredited)
- Angela Sarafyan as Inessa Kovalevsky
- Channon Roe as Cal
- Alla Korot as Suzanne Cummings
- JoBeth Williams as Miriam Henderson
- Jay Acovone as Tom Wegman
- Danielle Burgo as Carrie Bendis
- Henry Ian Cusick as Theo Stoller
- Stana Katic as Collette Stenger
- Martin A. Papazian as Rick Burke
- Yorgo Constantine as Mikhail
- John Posey as Carl Mossman
- Skylar Roberge as Amy Martin
- Eric Winzenried as Terrorist
- Matt Battaglia as Agent Jennings
- John Gleeson Connolly as Sergeant Mike McLaren
- Taylor Nichols as Burke
- V.J. Foster as Terrorist
- Timothy V. Murphy as Schaeffer
- Robert Rusler as Hank
- Tim Edward Rhoze as Doctor Hill
- Erik Strikland as CTU Field Agent
- Ben Parrillo as Agent Finn
- Robert Maffia as Andrei
- Timothy Omundson as Polokoff
- Roman Varshavsky as Komar
- Alex Kuznetsov as Ostroff
- Peter Holden as Harry Swinton
- Brett Rickaby as Sam
- Christopher Amitrano as Brennan
- Matthew Boylan as Dwayne Thompkins
- Marci Michelle as CTU Worker Jackie a.k.a. Marci
- Anita Finlay as Presidential Aide Wendy Brown
Multiple Seasons[]
- Neal Matarazzo as Agent Graves (Seasons 2-3)
- Daniel Dae Kim as Agent Tom Baker (Seasons 2-4)
- Butch Klein as Darren Richards (Seasons 3-4)
- Matt Salinger as Marc Kaner (Seasons 3-4)
- Thomas Vincent Kelly as Dr. Marc Besson (Seasons 4-5)