| •Christopher Meloni | played | Detective Elliot Stabler (S01-S12) (272Eps.) |
| •Mariska Hargitay | played | Detective Olivia Benson (S01-) (319Eps.) |
| •Danny Pino | played | Detective Nick Amaro (S13-) (47Eps.) |
| •Kelli Giddish | played | Detective Amanda Rollins (S13-) (47Eps.) |
| •Richard Belzer | played | Sergeant John Munch (Detective S01-S08; Sergeant S09-) (319Eps.) |
| •Michelle Hurd | played | Detective Monique Jeffries (S01E14-S02E16; recurring previously) (12Eps.) |
| •Ice-T | played | Detective Odafin "Fin" Tutuola (S02E02-) (296Eps.) |
| •Adam Beach | played | Detective Chester Lake (S09; recurring previously) (19Eps.) |
| •Stephanie March | played | Assistant D.A. Alexandra Cabot (S02E02-S05E04; S11E05-S11E16; recurring otherwise) (81Eps.) |
| •Diane Neal | played | Assistant D.A. Casey Novak (S05E05-S09; recurring otherwise) (107Eps.) |
| •Michaela McManus | played | Assistant D.A. Kim Greylek (S10) (22Eps.) |
| •B. D. Wong | played | Dr. George Huang (S04-S12; recurring otherwise) (206Eps.) |
| •Tamara Tunie | played | Dr. Melinda Warner, M.E. (S07-S12; recurring otherwise) (133Eps.) |
| •Dann Florek | played | Captain Donald Cragen (S01-) (319Eps.) |
| •Steven Zirnkilton | played | Opening Narration (uncredited) (319Eps.) |