
| John Hensley | ... | Matt McNamara (80 episodes, 2003-2009) |
 | Dylan Walsh | ... | Dr. Sean McNamara (80 episodes, 2003-2009) |

| Julian McMahon | ... | Dr. Christian Troy (80 episodes, 2003-2009) |

| Joely Richardson | ... | Julia McNamara (79 episodes, 2003-2009) |

| Roma Maffia | ... | Dr. Liz Cruz / ... (76 episodes, 2003-2009) |
 | Linda Klein | ... | Nurse Linda (69 episodes, 2003-2008) |

| Kelly Carlson | ... | Kimber Henry (58 episodes, 2003-2009) |

| Kelsey Batelaan | ... | Annie McNamara (28 episodes, 2003-2008) |
 | Jessalyn Gilsig | ... | Gina Russo (17 episodes, 2003-2008) |

| Bruno Campos | ... | Dr. Quentin Costa (16 episodes, 2004-2005) |

| Valerie Cruz | ... | Grace Santiago (12 episodes, 2003) |

| Sanaa Lathan | ... | Michelle Landau (12 episodes, 2006) |
 | AnnaLynne McCord | ... | Eden Lord (10 episodes, 2007-2008) |

| Famke Janssen | ... | Ava Moore (9 episodes, 2004-2005) |

| Portia de Rossi | ... | Olivia Lord (9 episodes, 2007-2008) |

| Robert LaSardo | ... | Escobar Gallardo (9 episodes, 2003-2006) |

| Vanessa Redgrave | ... | Dr. Erica Noughton (8 episodes, 2004-2005) |

| Jacqueline Bisset | ... | James LeBeau (7 episodes, 2006) |

| Peter Dinklage | ... | Marlowe Sawyer (7 episodes, 2006) |

| Paula Marshall | ... | Kate Tinsley (7 episodes, 2007-2008) |

| Julie Warner | ... | Megan O'Hara (7 episodes, 2003-2006) |

| Ruth Williamson | ... | Hedda Grubman (6 episodes, 2003-2006) |

| Joey Slotnick | ... | Dr. Merril Bobolit (6 episodes, 2003-2006) |

| Phillip Rhys | ... | Jude Sawyer (6 episodes, 2003-2005) |
 | Nancy Cassaro | ... | Suzanne Epstein (5 episodes, 2003-2004) |

| Seth Gabel | ... | Adrian Moore (5 episodes, 2004) |

| Brittany Snow | ... | Ariel Alderman (5 episodes, 2005) |

| Bradley Cooper | ... | Aidan Stone (5 episodes, 2007-2008) |

| Rhona Mitra | ... | Kit McGraw (5 episodes, 2005) |

| Larry Hagman | ... | Burt Landau (5 episodes, 2006) |
 | Joshua Henry | ... | Wilber (5 episodes, 2006-2008) |
 | Josiah Henry | ... | Wilber (5 episodes, 2006-2008) |

| Oliver Platt | ... | Freddy Prune (4 episodes, 2007-2008) |

| Sharon Gless | ... | Colleen Rose (4 episodes, 2008) |
 | Georg Stanford Brown | ... | James Sutherland (4 episodes, 2004) |

| Rosie O'Donnell | ... | Dawn Budge (4 episodes, 2006-2008) |

| Kate Mara | ... | Vanessa (4 episodes, 2003) |

| Conor O'Farrell | ... | Detective Fischman (4 episodes, 2004-2005) |
 | Colleen Flynn | ... | Dr. Allamby (4 episodes, 2005-2006) |
 | Brian Kerwin | ... | Mr. Alderman (4 episodes, 2005) |

| John Schneider | ... | Ram Peters (4 episodes, 2007-2008) |

| Willam Belli | ... | Cherry Peck (4 episodes, 2004-2005) |
 | Palmer Scott | ... | Nigel the Director (4 episodes, 2007-2008) |

| Rose McGowan | ... | Dr. Theodora 'Teddy' Lowe (4 episodes, 2009) |

| Sophia Bush | ... | Ridley (3 episodes, 2003) |

| Jonathan Del Arco | ... | Sofia Lopez (3 episodes, 2003) |
 | Andrew Leeds | ... | Henry Shapiro (3 episodes, 2003-2004) |

| Brooke Shields | ... | Faith Wolper (3 episodes, 2006) |
 | Alanis Morissette | ... | Poppy (3 episodes, 2006) |

| Anne Heche | ... | Nicole Morretti (3 episodes, 2005) |

| Rebecca Gayheart | ... | Natasha Charles (3 episodes, 2004-2006) |

| Leslie Grossman | ... | Bliss Berger (3 episodes, 2003-2008) |

| Mary Page Keller | ... | Andrea Hall (3 episodes, 2004-2005) |

| Jennifer Hall | ... | Monica Wilder (3 episodes, 2006) |

| Maggie Siff | ... | Rachel Ben Natan (3 episodes, 2007-2008) |

| Jack Yang | ... | Chiyo (3 episodes, 2006) |

| Adria Dawn | ... | Parker (3 episodes, 2006) |
 | Tanner Richie | ... | Austin Morretti (3 episodes, 2005) |

| Bob Gunton | ... | Agent Sagamore (3 episodes, 2005) |
 | Charles Shen | ... | Hanae (3 episodes, 2006) |

| Katee Sackhoff | ... | Dr. Theodora 'Teddy' Lowe (3 episodes, 2009) |
 | Raymond Cruz | ... | Alejandro Pérez (2 episodes, 2003-2006) |

| Kathy Baker | ... | Gail Pollack (2 episodes, 2005) |

| Jennifer Coolidge | ... | Candy Richards (2 episodes, 2007-2008) |

| Brenda Strong | ... | Iris (2 episodes, 2003) |

| Daniel Zacapa | ... | Pepe (2 episodes, 2003) |
 | Jill Clayburgh | ... | Bobbi Broderick (2 episodes, 2004) |

| D.W. Moffett | ... | Kevin Hotchkiss (2 episodes, 2004) |

| Mario López | ... | Dr. Mike Hamoui (2 episodes, 2006) |

| Rebecca Metz | ... | Abby Mays (2 episodes, 2005-2006) |

| Jeannine Kaspar | ... | Emme Lowell (2 episodes, 2008) |

| Ricki Lopez | ... | Armand Otiz / ... (2 episodes, 2003-2006) |

| Ivonne Coll | ... | Genetics Lab Receptionist (2 episodes, 2003) |

| Rick Kelly | ... | Jim O'Hara (2 episodes, 2003) |

| Meera Simhan | ... | Dr. Meera Muthara (2 episodes, 2006) |

| Carol Kiernan | ... | Jesse Unger / ... (2 episodes, 2004-2006) |

| Lauren Hutton | ... | Fiona McNeil (2 episodes, 2007) |

| Grant Vaught | ... | Young Christian (2 episodes, 2003-2005) |

| Nancy Hirsch | ... | Side Pony Nurse / ... (2 episodes, 2008) |

| Heather Olt | ... | Assistant Director (2 episodes, 2007-2008) |
 | Elaine Hausman | ... | Allegra Calderella / ... (2 episodes, 2004-2009) |

| Joan Rivers | ... | Herself (2 episodes, 2004-2005) |

| Tara Buck | ... | Rhea Reynolds (2 episodes, 2005) |

| Katie Lohmann | ... | Party Girl / ... (2 episodes, 2003-2004) |

| Kari Nissena | ... | Nurse / ... (2 episodes, 2004) |

| Jennifer Sciole | ... | Nurse / ... (2 episodes, 2005) |

| René Ashton | ... | Alice (2 episodes, 2009) |
|
| Richard Levine | .... | co-executive producer / executive producer / ... (37 episodes, 2003-2008) |
| Jennifer Salt | .... | producer / co-producer / ... (37 episodes, 2003-2008) |
| Lynnie Greene | .... | co-executive producer / executive producer / ... (37 episodes, 2004-2008) |
| Sean Jablonski | .... | co-executive producer / supervising producer / ... (37 episodes, 2004-2008) |
| Bonnie Weis | .... | co-producer / associate producer / ... (37 episodes, 2005-2008) |
| Ryan Murphy | .... | executive producer (36 episodes, 2005-2008) |
| Michael M. Robin | .... | executive producer (36 episodes, 2005-2008) |
| Brad Falchuk | .... | producer / co-producer / ... (35 episodes, 2005-2008) |
| Patrick McKee | .... | producer / line producer (29 episodes, 2003-2006) |
| Alexis Martin | .... | associate producer / co-producer (23 episodes, 2006-2008) |
| Greer Shephard | .... | executive producer (13 episodes, 2005) |
| Linda Klein | .... | producer (9 episodes, 2007-2008) |
| Hank Chilton | .... | co-producer (8 episodes, 2007-2008) |
| Eve Watterson | .... | associate producer (8 episodes, 2007-2008) |
| Christopher Griffin | .... | producer (7 episodes, 2007-2008) |
|
| Hoot Maynard | .... | associate producer (unknown episodes) |
| |
|
| Eryn Krueger Mekash | .... | makeup department head / makeup artist (66 episodes, 2003-2008) |
| Stephanie A. Fowler | .... | key makeup artist / makeup artist (48 episodes, 2003-2008) |
| Thomas R. Burman | .... | special makeup effects artist / special effects makeup / ... (25 episodes, 2003-2008) |
| Bari Dreiband-Burman | .... | special makeup effects artist / special effects makeup / ... (25 episodes, 2003-2008) |
| Stacey K. Black | .... | hair stylist / key hair stylist (25 episodes, 2005-2008) |
| Crystal Wolfchild | .... | key makeup artist (13 episodes, 2005) |
| Carol A. O'Connell | .... | hair stylist (11 episodes, 2006-2007) |
| Scott Stoddard | .... | special makeup effects artist (10 episodes, 2006) |
| James MacKinnon | .... | makeup department head (7 episodes, 2003) |
| Jennifer Greenberg | .... | assistant makeup artist (7 episodes, 2007-2008) |
| David Dupuis | .... | special effects makeup (5 episodes, 2008) |
| Tom Killeen | .... | special makeup effects artist (3 episodes, 2006) |
| Pedro Valdez | .... | special makeup effects artist (3 episodes, 2006) |
| Brian Steven Banks | .... | hair stylist (3 episodes, 2009) |
| Carol Collini | .... | additional makeup artist (2 episodes, 2005) |
| Rocky Faulkner | .... | special makeup effects artist (2 episodes, 2007-2008) |
| Judy Staats | .... | additional makeup artist (2 episodes, 2009) |
|
| Dan Crawley | .... | makeup lab (unknown episodes) |
| Rebecca George | .... | assistant hair stylist (unknown episodes) |
| Heidi Grotsky | .... | assistant makeup artist (unknown episodes) |
| Rob Hinderstein | .... | makeup artist (unknown episodes) |
| Elizabeth Hoel | .... | assistant makeup artist (unknown episodes) |
| Carey Martine-Wareham | .... | makeup artist (unknown episodes) |
| Michele Payne | .... | hair stylist (unknown episodes) |
| |
|
| Ian Kay | .... | set property master / property master (72 episodes, 2003-2008) |
| Eva Firshein | .... | buyer (43 episodes, 2003-2005) |
| Alisha Rothman | .... | assistant property master (31 episodes, 2006-2009) |
| Eric S. Saperstein | .... | paint gangboss / paint foreman (20 episodes, 2006-2009) |
| Jeanne Bueche | .... | property assistant (15 episodes, 2005) |
| Eddie Grisco | .... | on-set dresser (15 episodes, 2006) |
| Isabelle Trichard | .... | art department coordinator (13 episodes, 2003) |
| Glenn Rivers | .... | set designer (13 episodes, 2005-2008) |
| Chris Call | .... | property master (12 episodes, 2005) |
| Andrew Allen-King | .... | assistant property master / propmaster: second unit (9 episodes, 2006) |
| Greg Gootsan | .... | prop assistant (6 episodes, 2007) |
| Charisse St. Amant | .... | props (3 episodes, 2008) |
| Ryan D. Compton | .... | propmaker (2 episodes, 2003) |
|
| Ryan Blank | .... | property master (unknown episodes) |
| David Coronella | .... | lead man (unknown episodes) |
| Ryan Patrick Kelly | .... | set dresser (unknown episodes) |
| Richard N. McGuire | .... | foreman (unknown episodes) |
| Michael Panevics | .... | property master (unknown episodes) |
| Christopher Redmond | .... | property master (unknown episodes) |
| Shannon Spinella | .... | set dresser (unknown episodes) |
| Robert A. Sturtevant | .... | construction coordinator (unknown episodes) |
| Stan Tropp | .... | set designer (unknown episodes) |
| |
|
| Duane Mieliwocki | .... | key first assistant camera / first assistant camera (70 episodes, 2003-2009) |
| Ken Little Jr. | .... | assistant camera (66 episodes, 2004-2009) |
| Andrew Glover | .... | gaffer (62 episodes, 2003-2008) |
| John Scott | .... | camera operator (61 episodes, 2003-2008) |
| Greg Hewett | .... | key grip (59 episodes, 2003-2007) |
| Jeffrey S. Lorenz | .... | first assistant camera (46 episodes, 2004-2006) |
| Joe Pacella | .... | film loader (44 episodes, 2005-2009) |
| Dan Ayers | .... | camera operator (14 episodes, 2003-2004) |
| Jason Puliti | .... | lighting technician (9 episodes, 2007-2008) |
| Sean Haeseler | .... | lighting technician (6 episodes, 2007) |
| Amos James | .... | grip (5 episodes, 2006-2007) |
| Taj J. Teffaha | .... | Steadicam operator / additional Steadicam (4 episodes, 2009) |
| Matt Zschoche | .... | additional lighting technician (3 episodes, 2005) |
| Steven Bentley | .... | gaffer: second unit (3 episodes, 2006) |
| Isaac McKee | .... | lighting technician (3 episodes, 2007-2008) |
| Michael Yarish | .... | still photographer (2 episodes, 2005-2007) |
| Martin Torner | .... | grip / rigging grip (2 episodes, 2006) |
| Joe Hill | .... | grip (2 episodes, 2007-2009) |
| Jerry Day | .... | key grip (2 episodes, 2007-2008) |
| King Lanaux | .... | grip (2 episodes, 2008) |
| Glen Holland | .... | lighting console programmer (2 episodes, 2009) |
|
| Dan Hofstad | .... | electrician (unknown episodes, 2003) |
| Henry Tirl | .... | Steadicam operator (unknown episodes, 2004) |
| Robin Bursey | .... | film loader (unknown episodes) |
| J.A. Byerly | .... | rigging gaffer (unknown episodes) |
| Kary Chapman | .... | key rigger (unknown episodes) |
| Cheli Clayton | .... | first assistant camera: "a" camera (unknown episodes) |
| Paul Cuffee | .... | electrician (unknown episodes) |
| Jeff Diaz | .... | rigging grip (unknown episodes) |
| Lance Dickinson | .... | electrician (unknown episodes) |
| Christopher Duskin | .... | camera operator (unknown episodes) |
| Jamal J. Farley | .... | electrician (unknown episodes) |
| Houman Forough | .... | camera operator (unknown episodes) |
| Prashant Gupta | .... | still photographer (unknown episodes) |
| Doug Hyun | .... | still photographer (unknown episodes) |
| Yaron Levy | .... | rigging (unknown episodes) |
| Jerry Mundy | .... | assistant chief lighting technician (unknown episodes) |
| David Norris | .... | camera operator: Wescam camera (unknown episodes) |
| Yiannis Samaras | .... | director of photography: second unit (unknown episodes) |
| Ralph Scherer | .... | dolly grip (unknown episodes) |
| Ryan Shopay | .... | set lighting (unknown episodes) |
| Val Sklar | .... | camera loader (unknown episodes) |
| David Neal Stewart | .... | electrician (unknown episodes) |
| Justin Stroh | .... | electrician (unknown episodes) |
| Nicholas Tredway | .... | grip (unknown episodes) |
| Alexis van Kersen Li | .... | assistant camera (unknown episodes) |
| Robert Zuckerman | .... | key art photographer (unknown episodes) |
| |
|
| Louis Farah | .... | supervising set medic (68 episodes, 2004-2009) |
| Jason Richert | .... | assistant production accountant (67 episodes, 2003-2009) |
| Diana Valentine | .... | script supervisor (47 episodes, 2004-2008) |
| Linda Klein | .... | medical consultant (44 episodes, 2003-2005) |
| Rorie D. Van Klaveren | .... | assistant production coordinator / production coordinator (44 episodes, 2005-2008) |
| Robert Foulkes | .... | location manager (43 episodes, 2003-2005) |
| Louis Farah Jr. | .... | medic / set medic (43 episodes, 2005-2009) |
| Dana Graham | .... | key assistant location manager (37 episodes, 2006-2009) |
| Kristine Greco | .... | script supervisor (31 episodes, 2004-2005) |
| Eve Watterson | .... | production coordinator (30 episodes, 2005-2006) |
| Melissa Engle | .... | key set production assistant (29 episodes, 2005-2006) |
| Jason Sholl | .... | global trainee (21 episodes, 2003-2004) |
| David Henke | .... | location manager (17 episodes, 2006-2008) |
| Mark Leone | .... | production assistant (16 episodes, 2007-2009) |
| Ashley Contino | .... | assistant to producers (15 episodes, 2005) |
| Christopher Grizey | .... | production assistant (15 episodes, 2005) |
| Hank Chilton | .... | story editor (15 episodes, 2006) |
| Michael Percival | .... | assistant location manager (15 episodes, 2006) |
| Jill Elphick | .... | assistant: Ryan Murphy (13 episodes, 2003) |
| Yuell Newsome | .... | stock librarian (13 episodes, 2003) |
| Thomas D. Jennings | .... | payroll accountant (12 episodes, 2003) |
| Dillon Neaman | .... | key production assistant (12 episodes, 2007-2008) |
| Lisa Karchinski | .... | assistant to producers (8 episodes, 2007-2008) |
| Guillaume Aubuchon | .... | production assistant (6 episodes, 2004) |
| Jacob Gilbert | .... | production assistant (5 episodes, 2008-2009) |
| Kathryn C. Galberth | .... | production assistant (4 episodes, 2003) |
| Christopher H. Warner | .... | production coordinator (4 episodes, 2006) |
| Erica Getler | .... | production assistant (4 episodes, 2008) |
| Christian Labarta | .... | set production assistant (3 episodes, 2004) |
| Lara Golder | .... | assistant: Vanessa Redgrave (3 episodes, 2005) |
| Justin Woychowski | .... | set production assistant (3 episodes, 2005) |
| Teena Garcia | .... | production assistant (2 episodes, 2004) |
| Morgan Rhodes | .... | set production assistant (2 episodes, 2005) |
| Matthew Roseman | .... | production assistant (2 episodes, 2006) |
| Sarah Burch | .... | production assistant (2 episodes, 2007) |
| Patrick Priest | .... | additional set production assistant (2 episodes, 2009) |
|
| Holly Ollis | .... | publicist (unknown episodes, 2004-2005) |
| John Arbuckle | .... | diver (unknown episodes) |
| Lillian Awa | .... | production assistant (unknown episodes) |
| Toussaint Banks | .... | key set production assistant (unknown episodes) |
| Michelle Basterrechea | .... | production assistant (unknown episodes) |
| Erica Beck | .... | production assistant (unknown episodes) |
| Scotty Brown | .... | key location manager (unknown episodes) |
| Beth Caldarello | .... | assistant production coordinator (unknown episodes) |
| Chelsey Cardon | .... | script coordinator (unknown e |