All 287 actors in both ER and Seinfeld
287 actors have appeared in both ER and Seinfeld, across 511 episodes. The most-credited is Lyn Alicia Henderson, Paramedic Pamela Olbes in ER and Clerk in Seinfeld.
| Actor | In ER | In Seinfeld | Eps | Eps |
|---|---|---|---|---|
| Lyn Alicia Henderson | Paramedic Pamela Olbes | Clerk | 149 | 1 |
| Estelle Harris | Mrs. Markovic | Estelle Constanza | 1 | 29 |
| Heidi Swedberg | Robin Turner | Susan Ross | 2 | 27 |
| Len Lesser | Woody Ebbots | Uncle Leo | 1 | 14 |
| Gedde Watanabe | Nurse Yosh Takata | Mr. Oh | 58 | 1 |
| Richard Herd | Dr. Murphy | Wilhelm | 1 | 12 |
| Richard Fancy | Mr. Thomas | Mr. Lippman, Mr. Breckman | 1 | 10 |
| Michelle C. Bonilla | Paramedic Christine Harms | Waitress | 58 | 1 |
| Jami Gertz | Dr. Nina Pomerantz | Jane | 6 | 1 |
| Mariska Hargitay | Cynthia Hooper | Melissa | 13 | 1 |
| Vanessa Marquez | Nurse Wendy Goldman | Receptionist | 27 | 1 |
| Lauren Bowles | Hannah | Waitress, Blonde Longhaired Woman, Waitress #1 | 1 | 9 |
| Ping Wu | Mr. Cheung | Ping | 1 | 4 |
| Veralyn Jones | Agent Vickery, Mrs. Powell | Renee | 2 | 3 |
| Victor Raider-Wexler | Vascular Doctor | Doctor | 1 | 4 |
| Debra Mooney | Leila Morgan, Barbara Feingold | Mrs. Sweedler | 3 | 1 |
| Perry Anzilotti | Dr. Perry (Anesthesiologist), Ed | Usher | 22 | 1 |
| Andrea Parker | Linda Farrell | Nurse | 10 | 1 |
| Scott Jaeck | Dr. Steven Flint | Officer Vogel | 12 | 2 |
| David Brisbin | Dr. Alexander Babcock | Client | 19 | 1 |
| Montrose Hagins | Mrs. Olson | Old Woman, Woman in Theatre | 1 | 2 |
| Tom Wright | Wharton | Morgan, Executive | 2 | 4 |
| Vaughn Armstrong | Greg Mitchell | Lt. Coleman | 1 | 2 |
| Gina Hecht | Radiology Tech | Dana Foley | 2 | 3 |
| Valerie Mahaffey | Joi Abbott | Patrice | 4 | 1 |
| Wayne Wilderson | Dr. Claypool | Walter | 1 | 4 |
| Megan Cole | Pathologist Dr. Upton | Peggy | 7 | 2 |
| Alex Kapp | Brenda | Maura | 1 | 1 |
| Harris Shore | Gym Teacher | Mr. Lippman | 1 | 1 |
| Jessica Hecht | Stephanie Lowenstein | Lindsay | 2 | 2 |
| Kari Coleman | Mona | Allison | 1 | 3 |
| Katherine LaNasa | Janet Wilco | Cathy | 1 | 1 |
| Lawrence Tierney | Jack Johnson | Alton Benes | 1 | 1 |
| Maggie Wheeler | Amy Kellerman | Cynthia | 1 | 1 |
| Thomas Dekker | 4 Year Old Boy | Bobby, Son (Porter) | 1 | 3 |
| Tony Plana | Priest | Manny | 1 | 1 |
| Deborah May | Nursing Director Mary Cain | Elsa | 7 | 1 |
| Lawrence Mandley | Jackson, Maintenance Man | Larry, Larry the Cook, Manager | 2 | 6 |
| Bill Macy | Richard Gould | Herb | 1 | 2 |
| Billye Ree Wallace | Helen 'Silvie' Rubadoux | Nana | 3 | 3 |
| Cynthia Ettinger | Linda Pryor, Mrs. Powell | Michele | 2 | 1 |
| Gail Strickland | Dr. Renee Spielman | Landis | 1 | 2 |
| Jon Gries | Defense Attorney Marty Nesmith | Homeless Man, Rusty | 1 | 2 |
| Kristin Davis | Leslie | Jenna | 1 | 2 |
| Lee Arenberg | Juke | Mike | 1 | 2 |
| Lisa Edelstein | Aggie Orton | Karen | 1 | 2 |
| Suanne Spoke | Mrs. Robbins, OB Receptionist | Customer | 2 | 1 |
| Thom Barry | T-Ball | Manager, Super | 1 | 2 |
| George Cheung | Mr. Chen, Mr. Fong | Owner | 4 | 1 |
| Sonya Eddy | Harriet, Student Affairs Secretary | Rebecca DeMornay | 3 | 2 |
| Anna Gunn | Ikabo's Lawyer | Amy | 1 | 1 |
| Daniel Dae Kim | Ken Sung | Student #1 | 4 | 1 |
| David Dunard | Irish Guy | Guard, Leader, Security Guard | 1 | 3 |
| David Naughton | Ben Stevens | Dick | 1 | 1 |
| Frances Bay | Georgia | Mabel | 1 | 3 |
| Gina Gallego | Instructor | Gina | 1 | 1 |
| John Christian Graas | Max Nielsen | Matthew | 1 | 2 |
| John Randolph | Mr. Franks | Frank | 1 | 1 |
| JoNell Kennedy | Judy Munder | Secretary | 1 | 1 |
| Judy Kain | Thomas | Lorraine | 1 | 1 |
| Kate Mulligan | Riggs | Party Guest, Sheri | 1 | 2 |
| Louis Mustillo | Steve O'Brien | Phil | 1 | 1 |
| Mark Harelik | James | Milos | 1 | 1 |
| Melody Ryane | Mrs. Reicher | Joanne | 1 | 1 |
| Michael Fairman | Mort Harris | Mr. Pensky | 1 | 1 |
| Miguel Sandoval | Mr. Perez | Marcelino | 1 | 2 |
| Rick Overton | Mr. McNamara | The Drake | 1 | 2 |
| Rif Hutton | Mr. Royston | Salesman | 1 | 1 |
| Shashawnee Hall | Detective Ford | Usher | 2 | 1 |
| Annie Korzen | Mrs. Grunwald | Doris, Passenger #2 | 1 | 4 |
| Ted Rooney | Dr. Tabash | Crichton | 6 | 1 |
| Angelo Tiffe | Mr. Klingman, Tom Putnam | Delivery Man | 2 | 1 |
| Benjamin W. S. Lum | Judge | Mailman, Stock Boy | 1 | 2 |
| Debra Jo Rupp | Mrs. Dibble | Katie | 1 | 2 |
| Diana Theodore | Teenage Girl | Remy | 1 | 2 |
| Kathy Griffin | Dolores Minky | Sally Weaver | 1 | 2 |
| Michael McShane | Hugo | Franklin Delano Romanowski | 1 | 2 |
| Peter Murnik | Officer Mulvahill | Lt. Martel | 1 | 2 |
| Rance Howard | Dr. Oliver Kostin | Blind Man, Farmer | 1 | 2 |
| Rick Hall | Detective in Larkin Case | Vet | 1 | 2 |
| Ashley Gardner | Simone Phillips | Marion | 1 | 1 |
| Bridget Sienna | Hernandez | Evie | 1 | 1 |
| Cathy Lind Hayes | Elaine Gasner | Woman Behind Elaine | 1 | 1 |
| Charles Emmett | Derezin | Orderly | 1 | 1 |
| Fred Applegate | Gus's Father | Rick Levitan | 1 | 1 |
| Jack McGee | Rodney McMullen | Ralph | 1 | 1 |
| Jack Shearer | Hal Grunwald | Mr. Tuttle | 1 | 1 |
| Jessica Tuck | Dr. Hemmings | Bonnie | 1 | 1 |
| Jill C. Klein | Mattie Gilman | Waitress | 1 | 1 |
| John Apicella | Mr. Etheridge | Repairman | 1 | 1 |
| John Posey | Mr. Ramsey | Dr. Fein | 1 | 1 |
| Kelly Perine | Collins | Usher | 1 | 1 |
| Marlee Matlin | Sign Language Instructor | Laura | 1 | 1 |
| Molly Hagan | Meredith Smart | Sister Roberta | 1 | 1 |
| Patricia Belcher | Ward Nurse | Woman #1 | 1 | 1 |
| Raye Birk | Mr. Hartley | Mr. Pless | 1 | 1 |
| Sherman Howard | Mr. Schoenberger | Roy | 1 | 1 |
| Steve Franken | Hank Travis | Brendan | 1 | 1 |
| Vince Grant | Jeff Woodman | Hal Kitzmiller | 1 | 1 |
| Mirron E. Willis | Detective Watkins | Officer #1 | 4 | 1 |
| Davenia McFadden | April Robinson, Mrs. Bevins | Coco Higgins | 2 | 1 |
| David Byrd | Howard Waller | Pharmacist, Roger | 1 | 2 |
| Elizabeth Morehead | Mrs. Simmons | Noel | 2 | 1 |
| George Gerdes | Jim Riley | Man #1 | 2 | 1 |
| Richard Gant | Mr. Lipson | Fred | 1 | 2 |
| Stacey Travis | Detective Weller | Holly | 2 | 1 |
| Tom Gallop | Dr. Roger Julian | Alan | 3 | 1 |
| Iqbal Theba | Dr. Zogoiby | Cabbie | 4 | 1 |
| Allan Kolman | Ed Minyard | Cab Driver | 1 | 1 |
| Anthony Starke | Dr. Craig | Jimmy | 2 | 1 |
| Brian McNamara | Gil Brenner | James | 1 | 1 |
| Bruce Jarchow | Dr. Hammond | Doctor, Mooney | 1 | 2 |
| Carol Kiernan | Desk Clerk, Doris | Mother | 2 | 1 |
| Cindy Lu | Chinese Woman | Worker | 1 | 1 |
| Colton James | Mickey | Jimmy | 2 | 1 |
| Debbie Lee Carrington | Ginger Jones | Tammy | 1 | 1 |
| Denise Dowse | Mrs. Lysell | Mother, Receptionist | 1 | 2 |
| Diana Castle | Sandy Maggioso | Mrs. Zanfino | 1 | 2 |
| Ellen Albertini Dow | Mrs. Riblet | Momma | 1 | 1 |
| Frank Noon | Birch | Patient | 1 | 1 |
| Janet Rotblatt | Lauretta Wienbach | Woman | 1 | 1 |
| Jeanine Jackson | Elise Stevens | Roxanne | 1 | 1 |
| Joe Basile | Officer Tom Bennini | Delivery Guy | 2 | 1 |
| Kay E. Kuter | Mr. Seaton | Older Priest | 1 | 1 |
| Larry Hankin | Bearded Homeless Guy | Tom Pepper (Kramer) | 1 | 2 |
| Michael Kagan | Chuck Arteburn | Willie | 1 | 1 |
| Mimi Lieber | Dr. Malcolm | Rula | 1 | 1 |
| Nancy Linehan Charles | Glenda Walton | Woman Exec. | 1 | 1 |
| Neil Giuntoli | Alan | Brody | 1 | 1 |
| Radmar Agana Jao | Nathan Prior, OB Nurse | Delivery Guy | 2 | 1 |
| Stan Sellers | James | Cop #2, McAdam | 1 | 2 |
| Tim Bagley | Archie Papion | Manager | 1 | 1 |
| Tobin Bell | Dr. Gary Wertz | Ron | 1 | 1 |
| William Utay | Dr. Lassally | Dr. Korval | 1 | 1 |
| Fred Pinkard | Mr. Stubey | Newstand Boy, Old Man | 1 | 2 |
| Ned Bellamy | Detective | Eddie | 2 | 1 |
| Patrick Kerr | George Deakins | La Forge - Clerk | 2 | 1 |
| Ricky Dean Logan | Ice Pick Guy | Hippie #1, The Freak | 1 | 2 |
| Rolando Molina | Rolando | Punk #1 | 5 | 1 |
| Walter Olkewicz | Georgia's Man | Nick | 1 | 2 |
| Allan Wasserman | Mr. Goldstein | Grossbard | 1 | 1 |
| David Purdham | Dr. Kallis | Dr. Resnick | 1 | 1 |
| Dom Magwili | Trauma Surgeon | Dustin | 1 | 1 |
| Dylan Haggerty | Coach Yazerski | Young Man | 1 | 1 |
| Eric Christmas | Mr. Heath | Haarwood | 1 | 1 |
| George Murdock | Mr. Sidowski | Testikov | 1 | 1 |
| Glenn Shadix | Eldon | Harold | 1 | 1 |
| Jesse D. Goins | Mr. Paige | Cop | 1 | 1 |
| Kathryn Joosten | Lois | Betsy | 1 | 1 |
| Kyle Sullivan | Nicholas Rosato | Son | 1 | 1 |
| Kymberly Newberry | Mrs. Bryant | Ms. Jordan | 1 | 1 |
| Peter Allas | Arresting Officer | Mario | 1 | 1 |
| Pierrino Mascarino | Mr. Clayton | Father Hernandez | 1 | 1 |
| Rosie Malek-Yonan | Nazely | Wife | 1 | 1 |
| Sab Shimono | Dr. Okida | Executive #1 | 1 | 1 |
| Shaun Toub | Butler | Pinter Ranawat | 1 | 1 |
| Taylor Negron | Mr. Prole | Hairdresser | 1 | 1 |
| Tom La Grua | Mr. Leonelli | Kernis | 1 | 1 |
| Tom Towles | Teenage Boy's Father | Tough Guy | 1 | 1 |
| Walter Addison | Mr. Kane | Man | 1 | 1 |
| Dee Freeman | Dr. Lutz | Service Assistant | 2 | 1 |
| Don Perry | Dr. Stan Breedlove | Bill | 2 | 1 |
| Jeanette Miller | Beverly, Flora | Old Woman | 2 | 1 |
| Jeris Lee Poindexter | Nate, Rafe | Man | 2 | 1 |
| Mik Scriba | James' Father | Bomb Squad Guy, Cop #1 | 1 | 2 |
| Wesley Thompson | Fritz | Poker Player #2 | 2 | 1 |
| Al Ruscio | Mr. Dellanova | Manager | 1 | 2 |
| Allen Bloomfield | Marty | Polar Bear | 1 | 1 |
| Apollo Dukakis | Damien Sianis | Doctor Baker Saul | 1 | 1 |
| Bill Gratton | Joe McGinnis | Postal Official | 1 | 1 |
| Charles Cyphers | Injured Civil War Reenactor | Gardner | 1 | 1 |
| Christopher Darga | Wilson | Driver | 1 | 1 |
| David Richards | Henderson, Priest | Maitre D' | 2 | 1 |
| Elsa Raven | Rosemary Smalls | Mom | 1 | 1 |
| Gina Mastrogiacomo | Ms. Myra | Prostitute | 1 | 1 |
| Ian Patrick Williams | Supervisor | Stubs | 1 | 1 |
| James Lashly | Eddie | Assistant | 1 | 1 |
| Jane Edith Wilson | Judy | Woman | 1 | 1 |
| Janni Brenn | Nurse Kass | Woman #2 | 2 | 1 |
| Jerry Hauck | Umpire | Tim | 1 | 1 |
| Michael Rivkin | Stan | Fulton | 1 | 1 |
| Nancy Lenehan | Edie Harvell | Volunteer | 1 | 1 |
| Nick LaTour | Old Man | Grandpa | 1 | 1 |
| Peggy Mannix | Mrs. Breeland, Mrs. Styman | Woman | 2 | 1 |
| Renee Faia | Brianna Thomas | Alice | 1 | 1 |
| Scott Burkholder | tbd | Prisoner | 1 | 1 |
| Stephen Lee | Mr. Dressler | Conrad | 1 | 1 |
| Terri Hanauer | Mrs. Haggerty | Julianna | 1 | 1 |
| Thomas Wagner | Furst | The Cook | 1 | 1 |
| Tim De Zarn | Mr. Krawczyk | Salesman | 2 | 1 |
| Ellis E. Williams | McClintock | Exterminator, Karl | 1 | 2 |
| Blaire Baron | Egyptologist Willa Goldman | Female Executive | 1 | 1 |
| Brent Hinkley | Fred Hopper | Lou | 1 | 1 |
| Brian Leckner | Lloyd | Attendant | 1 | 1 |
| Carol Ann Susi | Mrs. Clark | Carrie | 1 | 1 |
| Darlene Kardon | Elderly Woman | Mrs. Lupchek | 1 | 1 |
| David St. James | Kaplan | Doctor | 1 | 1 |
| June Kyoto Lu | Zuin-an | Ruby | 1 | 1 |
| Kieran Mulroney | Marty's Father | Timmy | 1 | 1 |
| Lillian Lehman | Bobbi | Judge | 1 | 1 |
| Marco Rodríguez | Agent Serena | Guillermo | 1 | 1 |
| Melissa Weil | Shelagh | Gwen | 1 | 1 |
| Paige Moss | Amy Stehly | Girl | 1 | 1 |
| Patience Cleveland | Mrs. Mills | Old Lady | 1 | 1 |
| Patricia Place | Mrs. Romero | Wife | 1 | 1 |
| Suzanne Cryer | Toni Stillman | Marcy | 1 | 1 |
| Tom Dahlgren | tbd | Priest | 1 | 1 |
| Tony Winters | Hotel Staffer | Peterman Employee | 1 | 1 |
| Toshi Toda | Japanese Businessman 1 | Mr. Tanaka | 1 | 1 |
| Vito D'Ambrosio | Forchet | Cop | 1 | 1 |
| Wesley Leong | Newstand Guy | Clerk | 1 | 1 |
| Connie Sawyer | Kathy Brennan, Second Old Lady | Old Woman | 2 | 1 |
| Louisa Abernathy | Mrs. Law, Mrs. Lyons | Nurse | 2 | 1 |
| Marcelo Tubert | Galloway | Father | 3 | 1 |
| Armin Shimerman | Levine | Stan | 1 | 1 |
| Jack Hallett | Jimmy Vogel | Alan | 1 | 1 |
| John F. O'Donohue | Mr. Goodwin | Gus | 1 | 1 |
| John Kapelos | Mr. Irby | Barry | 1 | 1 |
| Kim Gillingham | Mrs. Ramsey | Assistant | 1 | 1 |
| Maggie Egan | Kathleen Horne | Ticket Clerk | 1 | 1 |
| Mark Tymchyshyn | Mr. Pruitt | Phil Totola | 1 | 1 |
| Mo Gallini | Guy | Tough Guy | 1 | 1 |
| Paul Perri | Monty | Detective Danner | 1 | 1 |
| Shannon Holt | Helen Palsey | Carrie | 1 | 1 |
| Susan Beaubian | Dr. Weiss | Ticket Clerk #2 | 1 | 1 |
| Timothy McNeil | Rotolo | Jeff | 1 | 1 |
| Viveka Davis | Gilda Bernucci | Mona | 1 | 1 |
| Yvette Cruise | Carmen | Clerk | 1 | 1 |
| Viola Kates Stimpson | Ethyl, Mrs. Webb | Old Woman | 2 | 1 |
| Eugene Elman | Jerry | Buddy | 1 | 1 |
| F.J. Rio | Miguel Rivas | Street Tough | 1 | 1 |
| Frank Novak | Ted | Clerk | 1 | 1 |
| Harry S. Murphy | Dr. Hamill | Office Manager | 1 | 1 |
| Ivory Ocean | Mr. Preston | Officer Morgan | 1 | 1 |
| John Cothran, Jr. | Dennis Gant, Sr. | Man | 1 | 1 |
| LaRita Shelby | Reporter | Tour Leader | 1 | 1 |
| Leah Lail | Kara Nielsen | Stacy | 1 | 1 |
| Lenny Rose | Ralph | Passenger #2 | 1 | 1 |
| Merrin Dungey | Daphina | Cashier | 1 | 1 |
| Miguel Pérez | Santiago Escalona | Luis | 1 | 1 |
| Oscar Jordan | Cullen | Counterperson | 3 | 1 |
| Robert Noble | Santa | Salesman | 1 | 1 |
| Steve Eastin | Lorenzo | Cop #1 | 1 | 1 |
| Toni Sawyer | Lacy Kilmer | Tenant #1 | 1 | 1 |
| Winston J. Rocha | Officer Eddie Escobar | Security Agent | 1 | 1 |
| Bahni Turpin | Mrs. Lattimer | Waitress #1 | 1 | 1 |
| Bert Rosario | Damien | Man | 1 | 1 |
| Dedee Pfeiffer | Annie Raskin | Victoria | 1 | 1 |
| Eric Fleeks | Cop | Kicker | 1 | 1 |
| Gwen McGee | O.B. Chong | Janine | 1 | 1 |
| Jann Karam | Cameron | Sandi | 1 | 1 |
| Mari Weiss | Vicki | Woman #1 | 1 | 1 |
| Michael Luckerman | Backerman | Man | 1 | 1 |
| Mimi Craven | Mrs. Newberry | Cynthia | 1 | 1 |
| Nigel Gibbs | Matson | Tenant #2 | 1 | 1 |
| Richard Kuhlman | Jeremy | Man | 1 | 1 |
| Roger Eschbacher | Richard Tuggle | Man with Cane | 1 | 1 |
| Shannon Cochran | Mrs. Klingman | Sheila | 1 | 1 |
| Sid Newman | Marvin Kloner | Old Man | 1 | 1 |
| Steve Hofvendahl | Elizabeth's Patient | Man | 1 | 1 |
| Art Frankel | Ralph Meyers | Bldg 'C' | 1 | 1 |
| Charles Kahlenberg | Priest | Fred | 1 | 1 |
| Courtney Gains | Ronnie | Clerk | 1 | 1 |
| Irvin Mosley Jr. | Harry | Spike | 1 | 1 |
| Kyle Colerider-Krugh | Martin | Phone Guy #2 | 1 | 1 |
| Mike Hagerty | Mr. James | Rudy | 1 | 1 |
| Al Fann | Mr. Chamberlain | Judge | 1 | 1 |
| Clement E. Blake | Homeless Man | Dirt Person #1 | 1 | 1 |
| Earl Carroll | George Zito | Rider | 1 | 1 |
| Shannon Whirry | Doreen Brant | Cute Girl | 1 | 1 |
| Shelley Malil | Dr. Urami | Usher | 1 | 1 |
| Alison Martin | Mrs. Kendrick | Lucy | 1 | 1 |
| Bari K. Willerford | Mr. McDowell | Ron | 1 | 1 |
| Barry Cutler | McCollum | Policeman #2 | 1 | 1 |
| Eamonn Roche | Mr. Lang | Waiter | 1 | 1 |
| Eve Brenner | Wilma | Lady in Restaurant | 1 | 1 |
| Scott Klace | Chris Halpern | Guard | 1 | 1 |
| Peter Dennis | Mosely | Lew | 1 | 1 |
| Armando Molina | Sgt. Pete Jackson | Amigo | 1 | 1 |
| Earl Schuman | Leonard | Izzy Mandelbaum Sr. | 1 | 1 |
| Sean Moran | Mr. Blinker | Man | 1 | 1 |
| McNally Sagal | Madeline | Carol | 1 | 1 |
| Herb Mitchell | Priest | Business Man #1 | 1 | 1 |
| Myra Turley | Monica Ford | Foreman | 1 | 1 |
| Raoul N. Rizik | Raoul | Parade Goer | 1 | 1 |
| Robert Louis Kempf | Button Man | Businessman #2 | 1 | 1 |
| Tom Bailey | Sgt. Larkowski | Cop #2 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.