All 128 actors in both ER and Will & Grace
128 actors have appeared in both ER and Will & Grace, across 577 episodes. The most-credited is Lyn Alicia Henderson, Paramedic Pamela Olbes in ER and Nurse in Will & Grace.
| Actor | In ER | In Will & Grace | Eps | Eps |
|---|---|---|---|---|
| Lyn Alicia Henderson | Paramedic Pamela Olbes | Nurse | 149 | 1 |
| Kathleen Wilhoite | Chloe Lewis | Sally | 19 | 1 |
| Tim Bagley | Archie Papion | Larry | 1 | 17 |
| Sara Gilbert | Dr. Jane Figler | Cheryl | 15 | 1 |
| J.P. Manoux | Dr. Dustin Crenshaw, Mime | Minion | 24 | 1 |
| Charles C. Stevenson Jr. | Capt. Eddie | Smitty | 1 | 11 |
| Tom Gallop | Dr. Roger Julian | Rob | 3 | 17 |
| David Schwimmer | Dr. Karubian | Noah Broader | 1 | 7 |
| Eileen Brennan | Betty | Zandra | 2 | 6 |
| Marshall Manesh | Babu | Mr. Zamir | 1 | 7 |
| Mary McCormack | Debbie | Janet Adler | 6 | 2 |
| Matthew Glave | Dr. Dale Edson | Kirk | 15 | 1 |
| Michael Angarano | Zack | Elliot | 1 | 7 |
| Hallee Hirsh | Rachel Greene | Olivia Walker | 14 | 1 |
| Mary Pat Gleason | Anne Parks | Bridget, Sally | 1 | 4 |
| Tom Everett Scott | Eric Wyczenski | Alex | 8 | 1 |
| Stacy Keach | Mike Gates | Wendell Schacter | 3 | 1 |
| Nick Offerman | Rog | Jackson Boudreaux, Nick the Plumber | 1 | 2 |
| Raphael Sbarge | Mr. Kirkendall | Alex | 2 | 1 |
| Veronica Cartwright | Norma Houston | Judith McFarland | 2 | 1 |
| Bruno Campos | Dr. Eddie Dorset | Anton | 5 | 1 |
| Gary Grubbs | Emmett Chambliss | Harlin Polk | 1 | 1 |
| Ivar Brogger | Deposition Attorney | Mr. Hutt | 1 | 1 |
| Mark Harelik | James | Tim | 1 | 3 |
| Megan Cavanagh | Darlene | Terry | 1 | 1 |
| Miguel Ferrer | Mr. Parker | Nathan Berry | 1 | 1 |
| Peter Jacobson | Susan's molester | Paul Budnik | 1 | 1 |
| Reiley McClendon | Aaron James | Nixon | 1 | 1 |
| Earl Schuman | Leonard | Driver, Karen's Driver | 1 | 2 |
| Gina Hecht | Radiology Tech | Amy | 2 | 1 |
| John David Conti | Tony Pipitone | Man | 1 | 2 |
| Josh Keaton | Greg | Salvatore | 1 | 2 |
| Kathleen Archer | Cabbie | Delivery Woman | 1 | 2 |
| Ken Lerner | Harry Stopak, Stan Seidel | Bob | 2 | 1 |
| Piper Laurie | Sarah Ross | Sharon Timmers | 2 | 1 |
| Tom Poston | Earl | Norman | 2 | 1 |
| Debra Mooney | Leila Morgan, Barbara Feingold | Sister Robert | 3 | 1 |
| Matt Williamson | Fireman #1, Ted | Gene, Salesman | 2 | 2 |
| Larry Michelson | Frequent Flyer, Martin, Mr. Arrigo | Bellman | 6 | 1 |
| Adam Goldberg | Joshua Shem | Kevin Wolchek | 1 | 1 |
| Alex Kapp | Brenda | Alice Robinson | 1 | 1 |
| Amy Farrington | Sandy Mader | Phyllis | 1 | 1 |
| Anthony DeSantis | Stanley | Walter | 1 | 1 |
| Dean Cameron | Edward | Guy | 1 | 1 |
| Elaine Bromka | Melody Cranston | Outlet Shopper | 1 | 1 |
| Kathryn Joosten | Lois | Felicia | 1 | 1 |
| Kenneth Tigar | Dr. Keinholz | John | 2 | 1 |
| Kimberly Scott | Sandy's Mother | Author Rita Pigeon | 1 | 1 |
| Larry Sullivan | Martin Pryor | Robert | 1 | 1 |
| Mark Ankeny | Electrician | Ted Farmer | 1 | 1 |
| Mary Beth McDonough | Jean Twomey | Mom | 1 | 2 |
| Patrick Breen | Felix | Mitchell | 1 | 1 |
| Patrick Kerr | George Deakins | Choral Director | 2 | 1 |
| Sara Rue | Jane | Joyce Adler | 1 | 3 |
| Stephanie Faracy | Angie | Nurse Eva | 1 | 1 |
| Ray Porter | Sam Broder | Dad | 3 | 1 |
| Don Perry | Dr. Stan Breedlove | Bertram | 2 | 1 |
| Bob Rumnock | Phillip Berk | Salesman | 1 | 1 |
| Christopher Darga | Wilson | Officer Kirk | 1 | 1 |
| Fred Applegate | Gus's Father | Dr. Foster | 1 | 1 |
| Julia Vera | Reina | Concepcion | 1 | 1 |
| Karin Co | Kim Yeung | Woman #2 | 1 | 1 |
| Karl T. Wright | Dr. Norris | Wayne | 1 | 1 |
| Kristin Davis | Leslie | Nadine | 1 | 1 |
| Marianne Muellerleile | Mrs. Jarnowski | Jodie | 1 | 1 |
| Morgan Nagler | Natalie Logan | Salesperson | 1 | 1 |
| Niko Posey | Activist #2 | Waitress | 1 | 1 |
| Patricia Place | Mrs. Romero | Myrtle | 1 | 1 |
| Paul Keith | Paul | Guy | 1 | 1 |
| Robert Clendenin | Anesthesiologist | Bob Dent | 1 | 1 |
| Rod Britt | Mr. Helpful | Larry | 1 | 1 |
| Roscoe Lee Browne | Reverend Matthew Lynn | Linus | 1 | 1 |
| Shohreh Aghdashloo | Riza Kardatay | Pam | 1 | 1 |
| Walter Addison | Mr. Kane | D.T. Petersen | 1 | 1 |
| Julie Pop | Hannah, Mary Gitlitz | Pat | 2 | 1 |
| Robert Costanzo | Pernicious Anemia Man | Paul | 1 | 2 |
| Alice Hirson | Mrs. Anderson | Justice Ginsburg | 1 | 1 |
| Allison Smith | Denny | Molly McGann | 1 | 1 |
| Amanda Carlin | Librarian | Mrs. Sanwald | 1 | 1 |
| Andy Umberger | Dr. David Harvey | Captain | 2 | 1 |
| Bette Rae | Mrs. Gottschuck | Maid | 1 | 1 |
| Butch Klein | Wynn | Male Guest | 1 | 1 |
| Connie Sawyer | Kathy Brennan, Second Old Lady | Old Woman | 2 | 1 |
| Cynthia Mann | Margie Stein | Judy Green | 1 | 1 |
| David St. James | Kaplan | Smitty | 1 | 1 |
| Donna Ponterotto | Pearl | Woman | 1 | 1 |
| E.J. Callahan | Drunk | Janitor | 1 | 1 |
| Eddie Pepitone | Dying Patient | Walt | 1 | 1 |
| Ellen Albertini Dow | Mrs. Riblet | Sylvia Walker | 1 | 1 |
| Fiona Hale | Dorothy Holmes | Ruth | 1 | 1 |
| Franklin Cover | Thurnhurst | Justice Of The Peace | 1 | 1 |
| Gary Riotto | Cousins | Waiter | 2 | 1 |
| Gina Morelli | Mirissa | Grandma | 1 | 2 |
| Helen Geller | Jean, Mrs. Reynolds | Fiona | 2 | 1 |
| Jim Ortlieb | Cook | Ira | 1 | 1 |
| John P. Connolly | Officer Billy | Gardener | 1 | 1 |
| Kenneth Alan Williams | Dr. Gabriel | Steve | 2 | 1 |
| Kevin Brief | Walter Brosnich | Ralph | 1 | 1 |
| Maggie Wheeler | Amy Kellerman | Polly | 1 | 1 |
| Patricia Belcher | Ward Nurse | Ellie | 1 | 1 |
| Peter MacKenzie | Mr. Pasbalas | Mean Guy | 1 | 1 |
| Stephen Spinella | Henry Lotery | Bret | 1 | 1 |
| Wayne Wilderson | Dr. Claypool | Ellis Palmer-Payne | 1 | 1 |
| Wells Rosales | Cory | waiter #2 | 1 | 1 |
| Marissa Matrone | Kitty Peyser | Aunt Angie | 1 | 2 |
| Bruno Amato | Sheriff | Randy | 1 | 1 |
| Charles Emmett | Derezin | Luke | 1 | 1 |
| Cheryl White | Meryl Sites | Cheryl Bricker-Fossberg | 1 | 1 |
| Cyndi Martino | Jane | Nurse | 1 | 1 |
| Gregor Manns | Lincoln | Customer | 1 | 1 |
| Helen Eigenberg | Renee Weber Stewart | Vicky | 1 | 1 |
| Jack McGee | Rodney McMullen | Officer Murphy | 1 | 1 |
| Bob Rusch | Lillion | Drunk Man | 1 | 1 |
| Brad Grunberg | Masked Man | Ralph | 1 | 1 |
| Christian Middelthon | Johann | Man | 1 | 1 |
| David Douglas | Miller | Edward | 1 | 1 |
| Lindsey Fields | Gail | Nurse #1 | 1 | 1 |
| Marjorie Lovett | Colostomy bag lady | Mrs. Glasser | 1 | 1 |
| Michael Edward Thomas | Blackie | Caribbean Houseboy | 1 | 1 |
| Scott Haven | P.K. Palmer IV | Steve | 1 | 1 |
| Stephanie Erb | Mrs. Kinney | Mona | 1 | 1 |
| Alison Martin | Mrs. Kendrick | Gabby | 1 | 1 |
| Jennifer Manley | Nosebleed Lady | Polly | 1 | 1 |
| Wanda-Lee Evans | Mrs. Dorsett | Justice of the Peace | 1 | 1 |
| Steven Petrarca | Dudzik | Ralph | 1 | 1 |
| Eugene Elman | Jerry | Uncle Winnie | 1 | 1 |
| Irene Roseen | Inez | Doris | 1 | 1 |
| Trisha Simmons | Maureen | Woman | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.