All 123 actors in both ER and Modern Family
123 actors have appeared in both ER and Modern Family, across 581 episodes. The most-credited is Kasey Mahaffy, Johnny in ER and Dom in Modern Family.
| Actor | In ER | In Modern Family | Eps | Eps |
|---|---|---|---|---|
| Kasey Mahaffy | Johnny | Dom | 1 | 10 |
| Kristen Johnston | Nurse Manager Eve Peyton | Brenda | 6 | 1 |
| J.P. Manoux | Dr. Dustin Crenshaw, Mime | Todd | 24 | 1 |
| Ernie Hudson | Colonel James Gallant | Miles | 2 | 4 |
| Amy Pietz | Loren | Janice | 1 | 3 |
| Jami Gertz | Dr. Nina Pomerantz | Laura | 6 | 1 |
| Perry Anzilotti | Dr. Perry (Anesthesiologist), Ed | Stan | 22 | 1 |
| Celia Weston | Sister Maureen Chapman | Barb Tucker | 1 | 5 |
| Doug Budin | T.V. Producer | Mr. Peterson | 1 | 2 |
| Josh Gad | Sgt. Bruce Larabee | Kenneth | 1 | 2 |
| Tom Wright | Wharton | Pete | 2 | 1 |
| Paul Dooley | Henry Lewis | Murray | 4 | 1 |
| Brent Jennings | Nat | Shawn | 3 | 1 |
| Drew Powell | Dennis Voltaire | Terry | 1 | 1 |
| Irene Roseen | Inez | Mrs. Brooks | 1 | 1 |
| John DiMaggio | Narcotics Cop | Boat Captain | 1 | 1 |
| Jonathan Banks | Robert Truman | Donnie Pritchett | 1 | 1 |
| Judy Greer | Tildie Mulligan | Denise | 1 | 1 |
| Lombardo Boyar | Morris Campbell | Jose | 1 | 1 |
| Niecy Nash | Judith Anderson | Joan | 1 | 1 |
| Ray Liotta | Charlie Metcalf | Ray Liotta | 1 | 1 |
| Richard Riehle | Mandrake Patient | Norman | 1 | 1 |
| Robert Costanzo | Pernicious Anemia Man | Earl Chambers | 1 | 1 |
| Ron Perkins | Mr. Elmore | Judge Katz | 1 | 3 |
| Taylor Nichols | Mr. Adams | Mr. Plympton | 1 | 1 |
| Alyson Reed | Ginny | Angela | 1 | 2 |
| June Squibb | Social Security Daughter | Auntie Alice | 1 | 2 |
| Edward Asner | Dr. James McNulty | Herschel | 3 | 1 |
| Alice Dodd | Mrs. Sumpter | Dr. Klausner | 1 | 1 |
| Andy Fischer-Price | Tommy Cole | Coop | 1 | 1 |
| Bjørn Johnson | Mark Taylor | Anders | 1 | 1 |
| Chris Butler | Cop | Chip | 1 | 1 |
| Christopher B. Duncan | Matthew Graham | Security Guard | 1 | 1 |
| Dale E. Turner | Daniel Harrison | Jenkins | 1 | 1 |
| Deji LaRay | Tye Reynolds | Trapper Homebuyer | 1 | 1 |
| Eric Lange | Rod Stillman | Coach Stupak | 1 | 1 |
| Larry Sullivan | Martin Pryor | Teddy | 1 | 1 |
| Lauren Bowles | Hannah | Ana | 1 | 1 |
| Norma Michaels | Rose Franklin | Helen | 1 | 1 |
| Rod McLachlan | Tohill | Fred | 1 | 1 |
| Stacey Travis | Detective Weller | Kim | 2 | 1 |
| Terri Hoyos | Mrs. Corvalan | Abuela | 1 | 1 |
| Tom McGowan | Joe Bernero | Principal Roth | 2 | 1 |
| Vaughn Armstrong | Greg Mitchell | Mel | 1 | 1 |
| Kevin Berntson | Student #1, Willie | Raymond | 2 | 2 |
| Norma Maldonado | Munoz | Psychic | 2 | 1 |
| Ariela Barer | Jasmine Escalante | Sophie | 1 | 1 |
| Carol Abney | Fire Chief Amanda Miller | Woman At Debate | 1 | 1 |
| Gary Kraus | CJ | Father | 1 | 1 |
| Gretchen Morgan | Mary | Natalie | 1 | 1 |
| James McCauley | Dan Shore | Dean Miller | 1 | 1 |
| Janelle Marra | Heather Tartaglia | Valerie | 1 | 1 |
| Joe Nieves | Tony Dejesu | Francisco | 1 | 1 |
| Keegan-Michael Key | Witkowski | Tom Delaney | 1 | 1 |
| Marcus Folmar | Foreman | Photographer | 1 | 1 |
| Mary Anne McGarry | Alice Wakely | Winnie | 1 | 1 |
| Michelle Anne Johnson | Sarah Irving | Adoption Official | 1 | 1 |
| Sharon Omi | Nurse Sulla | Mrs. Ko | 1 | 1 |
| Simon Templeman | Gareth | Simon Hastings | 1 | 1 |
| Stacey Hinnen | Bolog | Guy at Gas Station | 1 | 1 |
| Stephanie Faracy | Angie | Dottie | 1 | 1 |
| Teri Gamble | Cashier | Principal | 1 | 1 |
| Zilah Mendoza | Mrs. Sanchez | Luisa | 1 | 1 |
| Anastasia Basil | Detective Weiss | Jilted Wife, Sydney | 1 | 2 |
| Christopher Darga | Wilson | Lou | 1 | 2 |
| Khamani Griffin | Clayton Davis | Davis | 1 | 2 |
| Ray Porter | Sam Broder | Lazlo | 3 | 1 |
| Eileen Galindo | Heather Tocci | Mindy | 1 | 1 |
| Eve Brenner | Wilma | Anders's Mother | 1 | 1 |
| Gwen McGee | O.B. Chong | City Clerk | 1 | 1 |
| Gwen Van Dam | Etta | Grams | 1 | 1 |
| Larry Herron | Mitch Kellems | Terry's Partner | 1 | 1 |
| Lou Beatty, Jr. | Dexter Jenkins | Spencer | 1 | 1 |
| Nancy Linari | Elizabeth Puro | Patti Larkin | 1 | 1 |
| Randee Heller | Mrs. Goldberg | Rita | 1 | 1 |
| Ray Laska | Detective Orr | Burt | 1 | 1 |
| Sandra Purpuro | Mrs. Perrault | Donna | 1 | 1 |
| Shannon Cochran | Mrs. Klingman | Nancy Decker | 1 | 1 |
| Steve Tom | MacPherson | Chip | 1 | 1 |
| Tom Choi | Zafares | Bob | 1 | 1 |
| Zak Boggan | Boy | Kid | 1 | 1 |
| Marcus Brown | Bone, Mr. Birk | Security Guard | 2 | 1 |
| Darius Dudley | Clyde | Dale | 1 | 1 |
| Donald Sage MacKay | Detective Lash | George Ross | 1 | 1 |
| Efrain Figueroa | Julio Echevarria | Father Marquez | 1 | 1 |
| Jenn Liu | Rocker Girl | Mahnoosh | 1 | 1 |
| Jeremy Glazer | Med Student David | Kieran | 1 | 1 |
| John Kapelos | Mr. Irby | Stavros | 1 | 1 |
| Julie Dretzin | Shelly | Tyler's Mom | 1 | 1 |
| Kevin Fry | Detective Demetras | Security Guard | 1 | 1 |
| Lonnie Colon | Driver | Rock Climb Operator | 1 | 1 |
| Monti Sharp | Henry | Tournament Official | 1 | 1 |
| Peggy Miley | Bird Lady | Hattie | 1 | 1 |
| Terrell Lee | Russomante | Security Guard | 1 | 1 |
| Tom Everett | Mr. Kazlaw | Dean | 1 | 1 |
| Cynthia Frost | Mrs. Fruhman | Jeremy's Grandma | 1 | 1 |
| Jay Harik | Seiger | Police Officer | 1 | 1 |
| Josh Clark | Officer McCauly | Father Krzyzieski | 1 | 1 |
| Juliette Jeffers | Elena Flemming | Mom | 1 | 1 |
| Ruth Williamson | Registry Nurse | Marilyn | 1 | 1 |
| Tessa Auberjonois | Helena | Nancy | 1 | 1 |
| Tom Parker | Matt Gilespie | Doctor | 1 | 1 |
| Edward James Gage | Orderly | Porter | 1 | 1 |
| Mike Madrigal | Granger | Luke's Teacher | 1 | 1 |
| Susan Beaubian | Dr. Weiss | Waitress | 1 | 1 |
| Warren Sweeney | Mr. Tierny | Schwartz | 1 | 1 |
| Duane R. Shepard, Sr. | Janitor | Passenger #2 | 1 | 1 |
| Jim Piddock | Dr. Earl Whitehead | Malcolm Fennerman | 1 | 1 |
| Kylee Russell | Lola | Party Girl #3 | 1 | 1 |
| Maile Flanagan | Tina Martinelli | Immigration Officer | 1 | 1 |
| Marty Ryan | Brant | Don | 2 | 1 |
| Nike Doukas | Mrs. O'Connor | Mrs. Nuttle | 1 | 1 |
| William Utay | Dr. Lassally | The Great Majesto | 1 | 1 |
| James Gleason | Garrett Palsey | Mr. Ingram | 1 | 1 |
| Judy Kain | Thomas | Doris | 1 | 1 |
| Rod Keller | Evan | Mumford | 1 | 1 |
| Candace Edwards | Lacy | Nurse | 1 | 1 |
| Jon Curry | Karl | Pool Guest | 1 | 1 |
| Lyle Kanouse | Mitch | Hugo | 1 | 1 |
| Ian Patrick Williams | Supervisor | Minister | 1 | 1 |
| Hamilton Mitchell | Guy from Chairs | Older Bartender | 1 | 1 |
| Louise Claps | Mrs. Jenkins | Irene | 1 | 1 |
| Ross Mackenzie | Fred | Older Lackey | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.