| Actor/Episode Count | Character |
| Kiefer Sutherland (195 Episodes) | |
| Mary Lynn Rajskub (126 Episodes) | |
| Carlos Bernard (115 Episodes) | |
| Elisha Cuthbert (79 Episodes) | |
| Dennis Haysbert (79 Episodes) | |
| James Morrison (64 Episodes) | |
| Reiko Aylesworth (62 Episodes) | |
| Jude Ciccolella (58 Episodes) | |
| Kim Raver (53 Episodes) | |
| Glenn Morshower (50 Episodes) | |
| D.B Woodside (48 Episodes) | |
| Roger Cross (45 Episodes) | |
| Penny Johnson Jerald (45 Episodes) | |
| Gregory Itzin (44 Episodes) | |
| Cherry Jones (43 Episodes) | |
| Annie Wersching (37 Episodes) | |
| Louis Lombardi (37 Episodes) | |
| Sarah Clarke (36 Episodes) | |
| Bob Gunton (31 Episodes) | |
| Jayne Atkinson (30 Episodes) | |
| Carlo Rota (29 Episodes) | |
| Eric Balfour (28 Episodes) | |
| Xander Berkeley (27 Episodes) | |
| Sarah Wynter (25 Episodes) | |
| Leslie Hope (24 Episodes) | |
| James Badge Dale (24 Episodes) | |
| Peter MacNicol (24 Episodes) | |
| Jean Smart (24 Episodes) | |
| Freddie Prinze Jr. (24 Episodes) | |
| Marisol Nichols (24 Episodes) | |
| John Boyd (24 Episodes) | |
| Frank John Hughes (24 Episodes) | |
| Zachary Quinto (23 Episodes) | |
| Paul Schulze (23 Episodes) | |
| Janeane Garafolo (21 Epiodes) | |
| Nazneen Contractor (21 Episodes) | |
| William Devane (20 Episodes) | |
| Necar Zedagan (20 Episodes) | |
| Katee Sackhoff (20 Episodes) | |
| Jeffrey Nordling (19 Episodes) | |
| Michelle Forbes (18 Episodes) | |
| Daniel Bess (18 Episodes) | |
| Geoff Pierson (18 Episodes) | |
| Arnold Vosloo (18 Episodes) | |
| Mykelti Williamson (17 Episodes) | |
| Anil Kapoor (15 Episodes) | |
| Nick Jameson (15 Episodes) | |
| Sprague Grayden (15 Episodes) | |
| Zeljko Ivanek (15 Episodes) | |
| Adoni Maropis (15 Episodes) | |
| Powers Boothe (14 Episodes) | |
| Jesse Borrego (14 Episodes) | |
| Laura Harris (14 Episodes) | |
| Alberta Watson (13 Episodes) | |
| Tzi Ma (13 Episodes) | |
| Vicellous Shannon (13 Episodes) | |
| Colm Feore (12 Episodes) | |
| Jonathan Adhout (12 Episodes) | |
| Michael Massee (12 Episodes) | |
| Chris Diamantopoulos (12 Episodes) | |
| Lana Parilla (12 Episodes) | |
| Ryan Cutrona (12 Episodes) | |
| Joaquim De Almeida (12 Episodes) | |
| Vincent Laresca (12 Episodes) | |
| John Terry (12 Episodes) | |
| Rena Sofer (12 Episodes) | |
| Shohreh Aghdashloo (12 Episodes) | |
| Rick Schroder (12 Episodes) | |
| Christina Chang (11 Episodes) | |
| Julian Sands (11 Episodes) | |