All 104 actors in both Grey's Anatomy and Mom
104 actors have appeared in both Grey's Anatomy and Mom, across 637 episodes. The most-credited is Mark Saul, Dr. Steve Mostow in Grey's Anatomy and Cooper in Mom.
| Actor | In Grey's Anatomy | In Mom | Eps | Eps |
|---|---|---|---|---|
| Mark Saul | Dr. Steve Mostow | Cooper | 36 | 2 |
| Reggie De Leon | Joshy | Paul | 1 | 20 |
| Grace Rowe | Paramedic Grace | Joan | 17 | 1 |
| Lauri Johnson | Grandma Ruth | Beatrice | 1 | 16 |
| Will Sasso | Jet / Maintenance Worker | Andy | 2 | 12 |
| Don McManus | Samuel Linden | Steve Casper | 1 | 10 |
| Mary Pat Gleason | Marge Walker | Mary | 1 | 8 |
| Amy Hill | Joanne | Beverly | 1 | 7 |
| Charlie Robinson | Leo Paulson | Mr. Munson | 1 | 7 |
| Mimi Kennedy | Verna Bradley | Marjorie Armstrong | 1 | 7 |
| Chiquita Fuller | Ashley Wright | Taylor | 1 | 6 |
| John O'Brien | Lab Tech Jeffrey | Waiter | 13 | 1 |
| Constance Zimmer | Dr. Alana Cahill | Professor Turner | 5 | 1 |
| Missi Pyle | Dr. Nicole Baylow | Natasha | 1 | 5 |
| Winston Story | Dr. Leo Byrider | Dane | 20 | 1 |
| Wallace Langham | Dr. Steve Corridan | Jerry | 1 | 3 |
| Nicole J. Butler | Jess | Woman #1 | 1 | 2 |
| Tyne Daly | Carolyn Shepherd | Barbara | 2 | 1 |
| Mark Adair-Rios | David Morris | Dr. Gonzalez | 6 | 1 |
| Patricia Bethune | Nurse Ginger | Wanda | 6 | 1 |
| Amy Pietz | Shelby Lewis | Rebecca | 1 | 1 |
| Anna Maria Horsford | Nurse Elizabeth Fallon | Eve, Ms. Ferguson | 2 | 2 |
| Bill Fagerbakke | Roy Mackinaw | Sergeant Reubenzer | 1 | 1 |
| Julie Dretzin | Carmen Hall | Wendy | 1 | 1 |
| Lauren Bowles | Alice Franklin | Mary | 1 | 1 |
| Mark Bloom | Prosecutor | Armand | 1 | 1 |
| Dan Martin | Scott Hill | Juan | 2 | 1 |
| Rebecca Metz | Brenda Lawson | Bobbi | 1 | 2 |
| Teddy Vincent | Elderly Woman | Woman #4 | 1 | 2 |
| Cleo King | Robin | Sandy | 3 | 1 |
| Sam McMurray | Gus Moser | Ned | 1 | 3 |
| Tim Chiou | Paramedic #6 | Kevin | 3 | 1 |
| Bernie Kopell | Father Christopher | Ken | 1 | 1 |
| Carlease Burke | Mrs. Gates | Nurse Patricia | 1 | 1 |
| Carmella Riley | Dr. Simpson | Megan | 1 | 1 |
| Crista Flanagan | Andrea | Beth | 1 | 1 |
| Dan Bucatinsky | Jeffrey | Arthur | 1 | 1 |
| Eva La Dare | Police Officer #2 | Nurse | 1 | 1 |
| John Rubinstein | Keith Kalber | Professor Addison | 1 | 1 |
| Karly Rothenberg | Ruth Bennet | Ms. Harrington | 1 | 1 |
| Lela Lee | Mrs. Richardson | Alice | 1 | 1 |
| Mark Fite | Jared Cassidy | Wendell | 1 | 2 |
| Michelle Arthur | Brooke | Belinda | 1 | 2 |
| Miller Tai | Carl | Matt | 1 | 1 |
| Rob Brownstein | Larry | Dr. Mekizian | 1 | 1 |
| Sandy Martin | Sally | Lillian | 2 | 1 |
| Sonya Leslie | Rita | Nancy | 1 | 1 |
| Susan Ruttan | Mrs. Swore | Lucy | 1 | 3 |
| Terri Hoyos | Flor's Abuela | Soledad | 1 | 1 |
| Tracy Vilar | Becca McMurdo | Lorraine | 1 | 1 |
| Wayne Wilderson | Bill Adams | Dr. Butler | 1 | 2 |
| Alex Désert | Miles Green | Wes | 1 | 1 |
| Alimi Ballard | Brent | Professor Gannon | 1 | 1 |
| Amy Farrington | Mary May | June | 1 | 1 |
| Christine Horn | Ericka | Officer Carter | 1 | 1 |
| Danielle Bisutti | Liz Langer | Dana | 1 | 1 |
| Ervin Ross | Emmett Lawson | Parking Attendant | 1 | 1 |
| Gary Kraus | Louis Cardon | Ted | 1 | 1 |
| Gillian Vigman | Gillian Mendelson | Melanie | 1 | 1 |
| June Squibb | Dr. Elsie Clatch | Dottie | 1 | 1 |
| Larry Cedar | Dr. Cohn | Male Voiceover | 1 | 1 |
| Marcuis Harris | Rob Mays | Clayton | 1 | 1 |
| Matt Roth | Michael Beglighter | Jerry | 1 | 1 |
| Meghan Maureen McDonough | Rita Belmont | Tina | 1 | 1 |
| Sonia Jackson | Patient #1 | Janet | 1 | 1 |
| Stephanie Erb | Mrs. Gantry | Louise | 1 | 1 |
| Tiffany Dupont | Zoe | Alicia | 1 | 1 |
| Regi Davis | Dr. Kevin Fisher | Manager | 2 | 1 |
| Aaron Krebs | Rob Platt | Drunk Customer | 1 | 1 |
| Alan Rachins | Louie | Jed | 1 | 1 |
| Amir M. Korangy | Dr. Safavi | Leo | 1 | 1 |
| Andrew James Allen | Coby McKee | Jackson | 1 | 1 |
| Becky O'Donohue | Jenna | GPS Voice | 1 | 1 |
| Daniel Steven Gonzalez | Paramedic Garza | Swat Officer | 1 | 1 |
| James Earl | Evan | Dudley | 1 | 1 |
| Jim Turner | Dr. Schacter | Rick | 1 | 1 |
| Lilli Birdsell | Emily Rochester | Lydia | 1 | 1 |
| Lois Smith | Mrs. Dickinson | Claire Dickinson | 1 | 1 |
| Mark Berry | AA Member | Douglas | 1 | 1 |
| Mason McCulley | Ryan | Christopher Peterson | 1 | 1 |
| Miriam Flynn | Ms. Bitzer | Arlene | 1 | 1 |
| Monica Garcia | Peds Nurse | Soledad | 1 | 1 |
| Rob Nagle | Howard Bonaman | M.C. | 1 | 1 |
| Susan Chuang | Naomi Evans | Luanne | 1 | 1 |
| Tom Amandes | Charlie Waller | Richard | 1 | 1 |
| Alison La Placa | Mrs. Nolston | Louanne | 2 | 1 |
| Caleb Pierce | Charlie Patterson | Glen | 1 | 1 |
| David Chan | Mr. Madera | Waiter | 1 | 1 |
| Meg Steedle | Melissa | Shelly | 1 | 1 |
| Michael Canetty | Dr. Shagrin | Vern | 1 | 1 |
| Michanne Quinney | Tori | Hostess | 1 | 1 |
| Michelle N. Carter | Exam Proctor | Tracy | 1 | 1 |
| Patrick O'Connor | Judge Finch | Minister | 1 | 1 |
| Ron Roggé | Fire Captain | Fireman #3 | 1 | 1 |
| Anzu Lawson | Executive Three | Luanne | 1 | 1 |
| Duane R. Shepard, Sr. | Trial Patient #5 | Al | 1 | 1 |
| George Anthony Bell | Judge | Justice of the Peace | 1 | 1 |
| Johnathan McClain | Dr. Rich Gregory | Mark | 1 | 1 |
| Stacey Moseley | Donna | Customer | 1 | 1 |
| Timothy E. Goodwin | Len | Passenger #2 | 1 | 1 |
| Jason Boegh | Excited Doctor 1 | Waiter | 1 | 1 |
| Jeff Holman | Mr. Felker | Bob | 1 | 1 |
| Mike Kersey | Sales Clerk | Ed | 1 | 1 |
| Susan Berger | Lee | Betty | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.