All 52 actors in both ER and The Office
52 actors have appeared in both ER and The Office, across 533 episodes. The most-credited is Amy Ryan, Sister Elizabeth in ER and Holly Flax in The Office.
| Actor | In ER | In The Office | Eps | Eps |
|---|---|---|---|---|
| Amy Ryan | Sister Elizabeth | Holly Flax | 1 | 14 |
| David Denman | Jeremy Willis / "Angel" | Roy Anderson | 1 | 13 |
| Charles Esten | Dr. Barry Grossman | Josh Porter | 4 | 8 |
| Amy Pietz | Loren | Donna | 1 | 5 |
| Maura Tierney | Dr. Abby Lockhart | Mrs. California | 2 | 1 |
| Rick Overton | Mr. McNamara | Mr. Beesly | 1 | 4 |
| Michael Patrick McGill | Detective Ed Bernstein, Security #1, Officer Jeffries | Kenny Anderson | 6 | 3 |
| Lisa K. Wyatt | Transpo Tech | Lynn | 1 | 3 |
| Randall Park | Yong-Jo Pak | Asian Jim Halpert | 1 | 1 |
| Tom Chick | Weissbroot | Gil | 1 | 5 |
| Nick D'Agosto | Andy | Hunter | 2 | 3 |
| Ed Lauter | Fire Captain Dannaker | Sam Stone, Sr. | 6 | 1 |
| Jackie Debatin | Judy | Elizabeth the Stripper | 1 | 3 |
| Drew Powell | Dennis Voltaire | The Bartender | 1 | 1 |
| Edward James Gage | Orderly | Larry Meyers | 1 | 1 |
| Kwame Boateng | James Dixon | Derrick | 1 | 1 |
| Michael Weston | Rafe Hendricks | Roger | 2 | 1 |
| Phil Abrams | Rodney | Shelby Thomas Weems | 1 | 1 |
| Valeri Ross | McGillis | Stenographer | 4 | 1 |
| Wayne Wilderson | Dr. Claypool | Martin | 1 | 2 |
| Cindy Drummond | Louise | Ryan's Mom | 1 | 1 |
| Erica Tazel | Mrs. Birk | Julia | 1 | 1 |
| June Squibb | Social Security Daughter | Michael's Mom | 1 | 1 |
| Lisa Darr | Nadine Wilkes | Barbara Allen | 1 | 1 |
| Mary Kathleen Gordon | Rose | Telemarketer | 1 | 1 |
| Patrick O'Connor | CT Surgeon | Lester Snyder | 1 | 1 |
| Allan Wasserman | Mr. Goldstein | Nick Figaro | 1 | 1 |
| Connie Sawyer | Kathy Brennan, Second Old Lady | Nana | 2 | 1 |
| Eve Sigall | Genie Weller | Nursing Home Resident | 1 | 1 |
| Noah Blake | Sean | Waiter | 1 | 1 |
| Ransford Doherty | Randall James | Event Security | 1 | 1 |
| Steve Seagren | Zimmer | Cop #2 | 1 | 1 |
| Barry Sigismondi | Hamer | WB Jones | 1 | 1 |
| Emerson Brooks | Gonzalez | Air Force Recruiter | 1 | 1 |
| Jim Jansen | Neonatologist | High School Principal | 1 | 1 |
| Takayo Fischer | Trinnie | Meredith Hospital Roommate | 1 | 1 |
| Britain Spellings | Sackowitz | Craps Dealer | 2 | 1 |
| Oscar Daniel Blanco | Carlos Moore | Hispanic Boy | 1 | 1 |
| Stewart Skelton | John Taylor | Dipido Smith | 1 | 1 |
| Warren Sweeney | Mr. Tierny | Richard Corey | 1 | 1 |
| Brad William Henke | John | Frank | 1 | 1 |
| Maile Flanagan | Tina Martinelli | Phyllis' Sister | 1 | 1 |
| Robert Bagnell | Paxton | Alan | 1 | 1 |
| Tate Hanyok | Claire | Rhee | 1 | 1 |
| Ross Mackenzie | Fred | Dennis | 1 | 1 |
| Damani Roberts | Sammy | Chet Montgomery | 1 | 1 |
| Jeremy Radin | Leonard | Flower Delivery Man #2 | 1 | 1 |
| John F. Schaffer | Drooling Patient | Photographer | 1 | 1 |
| Matt DeCaro | Soccer Dad | Jerry | 1 | 1 |
| Shannon Cochran | Mrs. Klingman | Pam's Mom | 1 | 1 |
| Sue Nelson | Brenda Wesson | Ms. Trudy | 1 | 1 |
| Christopher T. Wood | Dr. Higgins | Chili's Manager | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.