| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Alex Zakrzewski | Crew | Directing | Director | 1 |
 Bobby Roth | Crew | Directing | Director | 1 |
 Chris Brancato | Crew | Writing | Writer | 1 |
 Clyde Phillips | Crew | Writing | Writer | 1 |
 Fred Golan | Crew | Production | Producer | 6 |
 Graham Yost | Crew | Production | Executive Producer, Producer, Writer, Creator | 6 |
 Javier Grillo-Marxuach | Crew | Production | Producer, Writer | 6 |
 Jeremy Kagan | Crew | Directing | Director | 1 |
 Jon Avnet | Crew | Directing | Director, Producer, Executive Producer | 8 |
 Kevin Hooks | Crew | Directing | Director | 1 |
Laurence Andries | Crew | Writing | Writer | 3 |
 Michael W. Watkins | Crew | Directing | Director | 1 |
 Peter Werner | Crew | Directing | Director | 2 |
Philip Giffin | Crew | Sound | Music | 6 |
 Rodrigo García | Crew | Directing | Director | 1 |
 Tucker Gates | Crew | Directing | Director | 1 |
Stephen Sassen | Crew | Production | Producer | 6 |
 Craig Kuehne | Crew | Visual Effects | Visual Effects | 6 |
 Alex Meneses | Cast | Actress | Vicki Pineda | 1 |
 Alexander Gould | Cast | Actor | Tom at 8 | 1 |
 Ali Hillis | Cast | Actress | Melanie Stone | 1 |
 Alia Shawkat | Cast | Actress | Denise Stein | 1 |
 Alimi Ballard | Cast | Actor | Young Marvin Lloyd | 1 |
 Annika Peterson | Cast | Actress | Katrina | 1 |
 Anthony Montgomery | Cast | Actor | Recruit Dwight Baker | 1 |
 April Grace | Cast | Actress | Cynthia | 1 |
 Arlen Escarpeta | Cast | Actor | Cantrel LaFontaine | 1 |
 Beau Billingslea | Cast | Actor | Police Academy Commandant | 1 |
 Beth Grant | Cast | Actress | Landlady | 1 |
 Bob Clendenin | Cast | Actor | Doofus | 1 |
 Bobby Hosea | Cast | Actor | Greg Haymer | 1 |
 Brian Sites | Cast | Actor | Taylor Gates | 1 |
 Chase Ellison | Cast | Actor | Willie Stevens | 2 |
 Chris Gartin | Cast | Actor | Jonny Rand | 1 |
 Chris Mulkey | Cast | Actor | Kevin Van Horn | 1 |
 Christian Camargo | Cast | Actor | Bradley Dawson | 1 |
 Christopher Gorham | Cast | Actor | Gordon Sinclair | 1 |
 Christoph Krisea | Cast | Actor | Warden Frank Collins | 1 |
 Cody Kasch | Cast | Actor | Trevor 'T.J.' Jankowski Jr. | 1 |
 Cullen Douglas | Cast | Actor | Arnold Rabjohn | 1 |
Dakota Floeter | Cast | Young Wally Pollard | 1 | |
 Dan Byrd | Cast | Actor | Eddie Colson | 1 |
 Daniel Zacapa | Cast | Actor | Carlos Ramirez | 1 |
 David Burke | Cast | Actor | Jay Colson | 1 |
David Dunard | Cast | Actor | Irate Grandfather | 1 |
 David Proval | Cast | Actor | Paul Turcotte | 2 |
 Dayo Ade | Cast | Actor | Banger | 1 |
 Derek Hamilton | Cast | Actor | Jimmy Black | 1 |
 Donnie Wahlberg | Cast | Actor | Detective Joel Stevens | 24 |
 Dorian Harewood | Cast | Actor | Captain Ronald Hicks | 6 |
 Doug Hutchison | Cast | Actor | Wally Pollard | 1 |
 Erin Daniels | Cast | Actress | Officer Karen Crane | 1 |
 Ernie Grunwald | Cast | Actor | Charlie Graham | 1 |
 Fran Bennett | Cast | Actress | Beatrice Rahming | 1 |
 Frank John Hughes | Cast | Actor | Officer Vincent Manzani | 1 |
 Fredric Lehne | Cast | Actor | Reggie Flood | 1 |
 Garikayi Mutambirwa | Cast | Actor | Friend #2 | 1 |
 Gary Basaraba | Cast | Actor | Police Department Police Officer III Ray Hechler | 24 |
 Gina Hecht | Cast | Actress | Doreen Stein | 1 |
 Gregg Henry | Cast | Actor | Robert Colson | 1 |
 Gregory White | Cast | Actor | Judge Harold Denby | 1 |
 Henry G. Sanders | Cast | Actor | Police Sergeant Miller | 1 |
 Howard Hesseman | Cast | Actor | Mel Castle | 1 |
 J.C. Brandy | Cast | Actress | Chandler | 1 |
 Jason Gedrick | Cast | Actor | Police Department Police Officer II Tom Turcotte | 24 |
 Jason George | Cast | Actor | Thomas Paltrow | 1 |
 Jennifer Sky | Cast | Actress | Vanessa Griggs / Laura | 1 |
 Jessica Lundy | Cast | Actress | Vivian Colson | 1 |
 Joe Penny | Cast | Actor | Les Van Buren | 1 |
 Joe Spano | Cast | Actor | Henry Stein | 1 |
 John Kapelos | Cast | Actor | Hugo Pinkston | 1 |
 Kate Flannery | Cast | Actress | Tracey | 1 |
 Katee Sackhoff | Cast | Actress | Holly | 1 |
 Kathleen Wilhoite | Cast | Actress | Sally McBride | 1 |
 Kelly Hu | Cast | Actress | Rachel Durrel | 2 |
 Kelly Rowan | Cast | Actress | Marian McNorris | 3 |
 Ken Davitian | Cast | Actor | Jewelry Store Owner | 1 |
 Kevin Dunn | Cast | Actor | Ron Berman | 1 |
 Kim Murphy | Cast | Actress | Susan | 2 |
 Kim Rhodes | Cast | Actress | Julia Sloane | 1 |
 Kirk Trutner | Cast | Actor | Homeless Man | 1 |
 Kristin Bauer | Cast | Actress | Prostitute | 1 |
 Lana Parrilla | Cast | Actress | Teresa Ortiz, paramedic in season one, rookie police officer in season two | 24 |
 Larry Joshua | Cast | Actor | Chet | 1 |
 LeVar Burton | Cast | Actor | Marvin Lloyd | 1 |
Lisa Cerasoli | Cast | Actress | Mia Lang | 1 |
 Lombardo Boyar | Cast | Actor | Eddie | 1 |
 Loren Lester | Cast | Actor | Homeowner | 1 |
 Mark Moses | Cast | Actor | Don Schneider | 1 |
 Mark Totty | Cast | Actor | Chip Pollard | 1 |
 Marquise Wilson | Cast | Actor | Friend #3 | 1 |
 Matt Craven | Cast | Actor | Dr. Michael Hirsch | 2 |
 Megan Ward | Cast | Actress | Kelly Stevens | 7 |
 Michael Dempsey | Cast | Actor | Recovering drunk | 1 |
 Michael Muhney | Cast | Actor | Chris Griggs | 1 |
 Michael Paul Chan | Cast | Actor | Lobo Chan | 1 |
 Miguel A. Núñez Jr. | Cast | Actor | Freaktown | 1 |
Mimi Paley | Cast | Actress | Rachel Stein | 1 |
 Mykelti Williamson | Cast | Actor | Police Department Detective II Bobby 'Fearless' Smith | 24 |
 Nathan West | Cast | Actor | Zack Berman | 1 |
 Neal McDonough | Cast | Actor | Assistant District Attorney David McNorris | 24 |
 Neil Patrick Harris | Cast | Actor | Peter Corman | 1 |
 Nigel Gibbs | Cast | Actor | Alex Leonard | 1 |
 Nina Garbiras | Cast | Actress | Andrea Little, a reporter (season one) | 18 |
 Patricia Wettig | Cast | Actress | Nora Jean Flannery | 1 |
Paul Moyer | Cast | Actor | Paul Moyer | 1 |
Peter Trencher | Cast | Actor | Coroner | 1 |
 Raja Fenske | Cast | Actor | Puppet | 1 |
 Ramón Franco | Cast | Actor | Luis Valdoriso | 1 |
 Ray Laska | Cast | Actor | Edward Nelson | 1 |
 Rebecca Lowman | Cast | Actress | Lisa | 1 |
 Richard Erdman | Cast | Actor | Kevin's Dad | 1 |
 Rick Gomez | Cast | Actor | Detective Daniel Ramos | 2 |
 Rick Ravanello | Cast | Actor | Sean Dornan | 1 |
 Rino Romano | Cast | Actor | Paul Turcotte in 1976 | 1 |
 Robert LaSardo | Cast | Actor | Pope | 1 |
 Robert Wisdom | Cast | Actor | Chronic (Daryl C. Norcott) | 1 |
 Salvator Xuereb | Cast | Actor | John McBride | 1 |
 Shannon Sturges | Cast | Actress | Cherie Hechler | 1 |
 Sheeri Rappaport | Cast | Actress | Janice Edwards | 1 |
 Silas Weir Mitchell | Cast | Actor | Erik Sorenson | 1 |
 Stacy Keach | Cast | Actor | Jack 'Mac' McNorris | 1 |
 Stephen Macht | Cast | Actor | John Donadoni | 1 |
 Tommy Hinkley | Cast | Actor | Mr. Flannery | 1 |
 Tracey Walter | Cast | Actor | Dwayne | 1 |
 Trent Cameron | Cast | Actor | Bernie Leonard | 1 |
 Vanessa Williams | Cast | Actress | Detective Katherine Pierce | 6 |
 Virginia Madsen | Cast | Actress | Erika Ashland | 1 |
 Wade Williams | Cast | Actor | Paul Barnes | 1 |
 Wendy Schaal | Cast | Actress | Darlene Beechem | 1 |
Demetra Raven | Cast | Actress | Lara | 1 |
 Megan Henning | Cast | Actress | Emily | 1 |
 Paige Hurd | Cast | Actress | Grace Adams | 1 |
 Tyler Christopher | Cast | Actor | Holden McKay | 1 |
 Dempsey Pappion | Cast | Actor | Young Greg Haymer | 1 |
 Ryan Stockstad | Cast | Actor | Paramedic (uncredited) | 1 |
| Person | Type | Job | Role(s) | Episodes |
