All 175 actors in both 9-1-1 and ER
175 actors have appeared in both 9-1-1 and ER, across 474 episodes. The most-credited is Lyn Alicia Henderson, Social Worker in 9-1-1 and Paramedic Pamela Olbes in ER.
| Actor | In 9-1-1 | In ER | Eps | Eps |
|---|---|---|---|---|
| Lyn Alicia Henderson | Social Worker | Paramedic Pamela Olbes | 1 | 149 |
| Cocoa Brown | Carla Price | Judy | 18 | 1 |
| Angel Laketa Moore | Tasha | Nurse Dawn Archer | 1 | 34 |
| Terri Hoyos | Josephina "Pepa" Diaz | Mrs. Corvalan | 10 | 1 |
| Richard Brooks | Chief Simpson | Mr. Freeman | 9 | 1 |
| Glenn Plummer | Dennis Jenkins | Timmy Rawlins | 4 | 15 |
| Andi Chapman | Diedra | Joanie Albright | 9 | 2 |
| Erica Gimpel | Pauline Barrett | Adele Newman | 1 | 19 |
| Daniel Roebuck | Norman Peterson | Kyle Martin | 5 | 1 |
| Henry G. Sanders | Samuel Carter | Phillip | 5 | 1 |
| Freda Foh Shen | Anne Lee | Audiologist | 5 | 3 |
| Connor Trinneer | Jessie | EMT | 4 | 1 |
| Romy Rosemont | Lola Peterson | Joanne Bairos | 5 | 1 |
| Tara Karsian | Ruth | Liz Dade | 2 | 7 |
| Leonard Roberts | Ronnie Cooper | Police Officer | 3 | 1 |
| Deborah May | Cindy | Nursing Director Mary Cain | 1 | 7 |
| Alexis Krause | Justine Zerbiak | Mallory | 1 | 1 |
| Jeff Kober | Earl Sheets | Stuart | 1 | 1 |
| John Marshall Jones | Dave Morrisey | Mr. Gaither | 3 | 1 |
| Kim Estes | Clive Wexler | Lieutenant Higgins | 2 | 1 |
| Steven Culp | Henry Wallace | Dave Spencer, Dr. Charles Cameron | 1 | 5 |
| Troy Winbush | Nathaniel Green | Uniform Cop | 3 | 1 |
| Colby French | Detective Marks | Greg Becton | 2 | 1 |
| Charles Emmett | DWP Engineer, Hector Silva | Derezin | 3 | 1 |
| John Eric Bentley | Mark | Larry Anderson | 1 | 1 |
| M.C. Gainey | Charlie | Darrion Walters | 1 | 1 |
| Mercedes Colon | Captain Reyna Ochoa | Detective | 3 | 1 |
| Eric Nenninger | Brian | Psychotic Biting Patient | 2 | 1 |
| George Wyner | Don | Rabbi | 1 | 2 |
| Christie Lynn Smith | Candice Baker | Marina Grasso | 1 | 1 |
| Christopher Cousins | Charles Bryson | Kyle Kolber | 1 | 1 |
| James Handy | Felix | Dan Sullivan | 1 | 1 |
| Jenny O'Hara | Nora Curtis | Nurse Rhonda Sterling | 1 | 2 |
| Jessica Tuck | Dr. Imelda Royce | Dr. Hemmings | 1 | 1 |
| Mark Pellegrino | Mitchell Trent | Nathan Conley | 1 | 1 |
| Patrick Fischler | Hollis Harcourt | Chamber Tech | 1 | 1 |
| Tony Sancho | ER Doctor Kenner | Emilio | 1 | 1 |
| Wallace Langham | Brian | Dr. Melvoin | 1 | 1 |
| Carole Gutierrez | Luann | Landlady | 4 | 1 |
| Anthony Starke | Brunson | Dr. Craig | 1 | 2 |
| David Kaufman | Cemetery Worker | Nick Dunn | 1 | 2 |
| Eddie Jemison | Doctor Gibson | Lysander Martin | 2 | 1 |
| Anne Gee Byrd | Fiona | Harper | 1 | 1 |
| Jon Paul Burkhart | Colton | Fred | 1 | 1 |
| JoNell Kennedy | Dr. Thompson | Judy Munder | 1 | 1 |
| Karina Logue | Sara Kramer | Radio Show Host | 1 | 1 |
| Lynn Milgrim | Marie Ellis | Ms. Crandell | 1 | 1 |
| Andy Umberger | Deputy Chief Phil Evans | Dr. David Harvey | 1 | 2 |
| Tom Wright | Buck's Doctor | Wharton | 1 | 2 |
| Alla Korot | Vicky | Mrs. Dupont | 1 | 1 |
| Arye Gross | Nathan Levinson | Kevin | 1 | 1 |
| Dendrie Taylor | Magda | Mrs. Knoll | 1 | 1 |
| Drew Powell | David Cohen | Dennis Voltaire | 1 | 1 |
| Frederick Koehler | Carl Gates | Benjamin Coe | 1 | 1 |
| Gregg Daniel | Dr. Cochran | Mr. Powell | 1 | 1 |
| Jack McGee | John "Red" Delacroix | Rodney McMullen | 1 | 1 |
| Jim O'Heir | Don Blevins | McKenna | 1 | 1 |
| John Rubinstein | Melvin | Dr. Kenner | 1 | 1 |
| Larry Sullivan | Dave Kramer | Martin Pryor | 1 | 1 |
| Stewart Skelton | Minister | John Taylor | 1 | 1 |
| Tim De Zarn | Cecil Farrier | Mr. Krawczyk | 1 | 2 |
| Tim Russ | Marriage Counselor | Dr. Medford | 1 | 1 |
| Tom Parker | Alex | Matt Gilespie | 1 | 1 |
| Ray Porter | Eugene | Sam Broder | 1 | 3 |
| Alex Solowitz | Barry Johnson | James / "Mr. Midnight" | 1 | 1 |
| Christian Clemenson | Franklin | Dr. Kurtag | 1 | 1 |
| Dylan Kenin | Harley | Louie | 1 | 1 |
| Gloria Garayua | Charity Neilson | Gloria Ortiz | 1 | 1 |
| Mandy June Turpin | Doris Claypool | Viv Rafferty | 1 | 1 |
| Marco Sanchez | Medical Tower Manager | O'Connor | 1 | 1 |
| Marisol Ramirez | Fiona | Mrs. Escalante | 1 | 1 |
| Nancy Youngblut | Cynthia | Sarah Howe | 1 | 1 |
| Richard Tanner | Ian | Dad | 1 | 1 |
| Rafael J. Noble | Older Man | Smitty | 1 | 2 |
| Jarrod Crawford | Dr. Hoffmann | David "Diamond Z" Zachary | 1 | 1 |
| Jerry Zatarain Jr. | Omar Pedrazo | Manny Salazar | 1 | 1 |
| Kimleigh Smith | Ms. Lorna | Ringwood | 1 | 1 |
| Marianne Muellerleile | Mrs. Ulyanov | Mrs. Jarnowski | 1 | 1 |
| Michael Monks | B. Johnson | Mr. Vennerbeck | 1 | 1 |
| Michael Whaley | Commander Bowman | Mr. Busey | 2 | 1 |
| Patricia Belcher | Neighbor | Ward Nurse | 1 | 1 |
| Robert Costanzo | Jack Kramer | Pernicious Anemia Man | 1 | 1 |
| Sal Viscuso | Anton | Mr. Weller | 1 | 1 |
| Shane Blades | Tom | Marcus Udesky | 1 | 1 |
| Terry Woodberry | Dt. Lonnie Wash | Cop | 1 | 1 |
| Jonelle Allen | Ellen Saxton | Debbie Marlin, Mrs. Mitchell | 1 | 2 |
| Mona Wyatt | Lyndsey Jenkins | Eva | 2 | 1 |
| Amy Pietz | Tori | Loren | 1 | 1 |
| Christopher B. Duncan | Paul Creedy | Matthew Graham | 1 | 1 |
| Dale Godboldo | Elton | Hiltzik | 1 | 1 |
| Dan Martin | Doctor | Lieutenant | 1 | 1 |
| Ivar Brogger | Dr. Irving | Deposition Attorney | 1 | 1 |
| John Cothran, Jr. | Ernest | Dennis Gant, Sr. | 1 | 1 |
| John Lacy | Officer Reynolds | Kevin Poole | 1 | 1 |
| Judy Kain | Trish | Thomas | 1 | 1 |
| Kasey Mahaffy | Lyle | Johnny | 1 | 1 |
| Keith Szarabajka | Rory | Mr. DeLuca | 1 | 1 |
| Larry Bagby | Carwash Manager | Second Reporter | 1 | 1 |
| Lyle Kanouse | Protester | Mitch | 1 | 1 |
| Maggie Egan | Janice | Kathleen Horne | 1 | 1 |
| Michael Bowen | Winslow Farrier | Dante Valerio | 1 | 1 |
| Tom Virtue | Tire Store Employee | Pares | 1 | 1 |
| Vanessa Martinez | Alana Perez | Tiffany James | 1 | 1 |
| Deborah Strang | Adele Summers | Mrs. Drane | 2 | 1 |
| Tommy Hinkley | Dermott Miller | Mr. Ellis | 1 | 2 |
| Audrey Wasilewski | Joan Wallace | Officer Wetterling | 1 | 1 |
| David DeLuise | Tom Gladden | Brad Anderson | 1 | 1 |
| Denise Dowse | Dave's Wife | Mrs. Lysell | 1 | 1 |
| Isabella Hofmann | Dr. Copeland | AIDS Clinic Doctor | 1 | 1 |
| Jack Impellizzeri | Winston Pearson | Bartender, Man | 1 | 2 |
| Matthew Yang King | Trauma Surgeon | Rick | 1 | 1 |
| Michael Dempsey | Officer Dowers | Mr. Beckwith | 1 | 1 |
| Pat Millicano | Truck Driver | Mr. Hahn | 1 | 1 |
| Terry Maratos | Richard | Garvey | 1 | 2 |
| Wilmer Calderon | Benjamin Cowan | Mickey Stubbs | 1 | 1 |
| Annie O'Donnell | Faye | Eve | 1 | 1 |
| Casey Biggs | Ned Filson | Mike | 1 | 1 |
| Corey Mendell Parker | Foreman | Byron Evers | 1 | 1 |
| David Bowe | Dr. Gordon | Father of Unicycle Boy | 1 | 1 |
| Jeremy Glazer | Ben Watson | Med Student David | 1 | 1 |
| Juliette Goglia | Hudson Groupie | Sydney Carlyle | 1 | 1 |
| McKinley Freeman | Darryl | Flight Medic | 1 | 1 |
| Peter Van Norden | Pawnbroker | Dr. Edwin Bain | 1 | 1 |
| Michael Earl Reid | Reggie Simmons | Bennet Owens | 1 | 2 |
| Cullen Douglas | Harv | Marvin | 1 | 1 |
| Eric Ladin | Gary | Pvt. Thomas Perry | 1 | 1 |
| Jenn Liu | Kirby | Rocker Girl | 1 | 1 |
| Judy Jean Berns | Phyllis Lang | Mrs. Fredriksson | 1 | 1 |
| Lou Beatty, Jr. | Reggie Franklin Sr. | Dexter Jenkins | 1 | 1 |
| Nigel Gibbs | Dave | Matson | 1 | 1 |
| Riley Schmidt | Harrison Meeks | Matt | 1 | 1 |
| Rusty Schwimmer | Edna | Grollman | 1 | 1 |
| Sean Christopher Davis | Landlord | Detective Maskins | 1 | 1 |
| Stephanie Erb | Miranda Filson | Mrs. Kinney | 1 | 1 |
| Verton R. Banks | Joe Frederick | Roswell | 1 | 1 |
| Sally Ann Brooks | Judy | Allison | 2 | 1 |
| Asante Jones | Jack Tannor | Workman #1 | 1 | 1 |
| Brian McGovern | Defense Attorney Barrett | Rob | 1 | 1 |
| Dalila Ali Rajah | Julia Saxton | Receptionist | 1 | 1 |
| David Douglas | Billy | Miller | 1 | 1 |
| Eileen Barnett | Muriel | Dr. Robbins | 1 | 1 |
| Gia Carides | Sandra | Suzanne Alner | 1 | 1 |
| Jamie Renee Smith | Penny | Emily Perrault | 1 | 1 |
| Jon Curry | Frederick Vaughn | Karl | 1 | 1 |
| Martin Garcia | City Lawyer | Airline Employee | 1 | 1 |
| Bob Rumnock | Artie | Phillip Berk | 1 | 1 |
| Carlos Moreno Jr. | Miguel | Mr. Ortiz | 1 | 1 |
| Matthew Jones | Zoo Sharp Shooter | Cop | 1 | 1 |
| Tom Simmons | David | Ethan Brown | 1 | 1 |
| Anoush NeVart | Psyhic | Sarshad | 1 | 1 |
| Kevin Sifuentes | Dante | MacGee | 1 | 1 |
| Mark Bramhall | Ned | Weisner | 1 | 1 |
| Steven M. Gagnon | Percy | Dr. Blum | 1 | 1 |
| Time Winters | Professor Russell Sharpe | Emil Savka | 1 | 1 |
| Earnestine Phillips | Woman | Nancy | 1 | 1 |
| Fran Montano | Phil Garrity | Johnson | 1 | 1 |
| Greta Sesheta | Marcia Jones | Mrs. Bassett | 1 | 1 |
| Pablo Espinosa | Fire Captain Martinez | Driver John | 1 | 1 |
| Terrah Bennett Smith | Dr. Lorenz | Annie Dixon | 1 | 1 |
| Joshua Dov | Ted | Matt | 1 | 1 |
| Warren Sweeney | Ira | Mr. Tierny | 1 | 1 |
| Louisa Abernathy | Older Woman | Mrs. Law, Mrs. Lyons | 1 | 2 |
| David Carrera | Attendee | T.J. | 1 | 1 |
| Steven Lee Allen | Morris | Contractor | 1 | 1 |
| Jayden Lund | Biker | Workman #2 | 1 | 1 |
| Kent Shocknek | National News Anchor | Newsreporter | 1 | 1 |
| Scott Menville | Ray | Beidermeier | 1 | 1 |
| Wiley Pickett | Captain Cooks | Impaled Man | 1 | 1 |
| Ethan Flower | Uniformed Cop | Brit #2 | 1 | 1 |
| Isianna Burgess | LAFD Tech | Noelle | 1 | 1 |
| Jaxy Boyd | Brenda | Shelby Krane | 1 | 1 |
| Sandra Cevallos | Judge Priya Atkins | Stacey | 1 | 1 |
| Vincent Duvall | Hugh | Father | 1 | 1 |
| Emily Adams | Kyle's Mother | Brenda Walton | 1 | 1 |
| Monti Sharp | Suit Salesman | Henry | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.