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| CTU Agent Jack Bauer Played by: Kiefer Sutherland Appearances: Eps. 1-?? |
Teri Bauer (deceased) Played by: Leslie Hope Appearances: Eps. 1-24 |
CTU Agent Nina Myers (in custody) Played by: Sarah Clarke Appearances: Eps. 1-24, 29-34, 57-?? |
Kimberly Bauer Played by: Elisha Cuthbert Appearances: Eps. 1-42, 45-?? |
Senator David Palmer Played by: Dennis Haysbert Appearances: Eps. 1-?? |
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| CTU Director Ryan Chappelle Played by: Paul Schulz Appearances: Eps. 14-15, 21 |
CTU Director Richard Walsh (deceased) Played by: Michael O'Neill Appearances: Eps. 1-2 |
CTU Acting Director Alberta Green Played by: Tamara Tunie Appearances: Eps. 10-15 |
CTU District Director George Mason (deceased) Played by: Xander Berkeley Appearances: Eps. 1, 4-5, 16-39 |
CTU Agent Tony Almeida Played by: Carlos Bernard Appearances: Eps. 1-15, 17-?? |
CTU Agent Jamey Farrell (deceased) Played by: Karina Arroyave Appearances: Eps. 1-4, 6-10, 24 |
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| Sherry Palmer Played by: Penny Johnson Jerald Appearances: Eps. 1-11, 13-16, 18-24, 30-39 |
Keith Palmer Played by: Vicellous Reon Shannon Appearances: Eps. 2-5, 7-9, 14, 16-19, 25 |
Nicole Palmer Played by: Megalyn Echikunwoke Appearances: Eps. 2, 5, 7, 16, 19-20 |
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| Chief of Staff Mike Novick Played by: Jude Ciccolella Appearances: Eps. 6, 9-14, 18, 20-21, 24, 31-?? |
Speechwriter Patty Brooks Played by: Tanya Wright Appearances: Eps. 1-2, 5, 14, 18, 20-23 |
Carl Webb Played by: Zach Grenier Appearances: Eps. 3-4, 6, 10-11, 13, 16, 19 |
Secret Service Agent Aaron Pierce Played by: Glenn Morshower Appearances: Eps. 2-5, 7-9, 16-17 |
Elizabeth Nash Played by: Kara Zediker Appearances: Eps. 14-17 | c
Maureen Kingsley Played by: Devika Parikh Appearances: Eps. 1, 5, 9, 13 |
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| Victor Drazen (deceased) Played by: Dennis Hopper Appearances: Eps. 20-24 |
Andre Drazen (deceased) Played by: Zeljko Ivanek Appearances: Eps. 10-24 |
Alexis Drazen (deceased) Played by: Misha Collins Appearances: Eps. 13-17, 22-23 |
Ted Cofell (deceased) Played by: Currie Graham Appearances: Eps. 10-11 |
Jovaan Myovic (deceased) Played by: Henri Lubatti Appearances: Eps. 14, 16, 18-19 |
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| Ira Gaines (deceased) Played by: Michael Massee Appearances: Eps. 2-13 |
Ex-DEA Agent Kevin Carroll (deceased) Played by: Richard Burgi Appearances: Eps. 1-7, 11-14 |
Mandy Played by: Mia Kirshner Appearances: Eps. 1-3, 48 |
Jonathan Played by: Rudolf Martin Appearances: Eps. 2-3, 7-8 |
Greg Penticoff Played by: John Hawkes Appearances: Eps. 4-5 |
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| Rick Played by: Daniel Bess Appearances: Eps. 1-8, 10-13, 15-20 |
Dan Allert (deceased) Played by: Matthew Carey Appearances: Eps. 1-6 |
Elijah Stram (deceased) Played by: Silas Weir Mitchell Appearances: Eps. 7-10 |
Janet York (deceased) Played by: Jacqui Maxwell Appearances: Eps. 1-6 |
Detective Krugman Played by: Darin Heames Appearances: Eps. 19-21 |