All 67 actors in both ER and Who's the Boss?
67 actors have appeared in both ER and Who's the Boss?, across 527 episodes. The most-credited is Ellen Crawford, Nurse Lydia Wright, Woodward in ER and Professor Wallace in Who's the Boss?.
| Actor | In ER | In Who's the Boss? | Eps | Eps |
|---|---|---|---|---|
| Ellen Crawford | Nurse Lydia Wright, Woodward | Professor Wallace | 114 | 1 |
| Scott Grimes | Dr. Archie Morris | Chad McCann | 26 | 1 |
| Tara Karsian | Liz Dade | Debbie | 7 | 1 |
| Billy Gallo | Captain Hutch | Al | 1 | 4 |
| Ralph P. Martin | Woody | Ernie | 1 | 4 |
| Christine Healy | Administrator Harriet Spooner | Jane | 3 | 1 |
| Conchata Ferrell | Mrs. Jenkins | Frances | 1 | 1 |
| Mark Costello | Kevin Halloran | Man in Steam Room #1 | 1 | 1 |
| Nancy Stafford | Alan's Mom | Trish Baldwin | 1 | 1 |
| Robert Costanzo | Pernicious Anemia Man | Robaire | 1 | 1 |
| John LaMotta | Ivan Gregor | Lido | 4 | 1 |
| Franklin Cover | Thurnhurst | Mr. Campbell, Mr. Kimball | 1 | 2 |
| Lawrence Mandley | Jackson, Maintenance Man | William | 2 | 1 |
| Naomi Serotoff | Grace | Rose Laudicina | 1 | 2 |
| Sam Scarber | Mr. Parnell, Willy Archibald | Parole Officer | 2 | 1 |
| Candice Azzara | Mrs. Roth | Fran Thomopolous | 1 | 3 |
| Anne Gee Byrd | Harper | Nurse | 1 | 1 |
| Armin Shimerman | Levine | Mr. Warner | 1 | 1 |
| Deborah Lacey | Det. Tincreed | Desiree | 1 | 1 |
| Dennis Burkley | Tom Perry | Pee Wee | 1 | 1 |
| Jim Jansen | Neonatologist | Dr. Doyle Ferguson | 1 | 1 |
| Peggy Mannix | Mrs. Breeland, Mrs. Styman | Delivery Woman | 2 | 1 |
| Richard Minchenberg | Dr. P.K. Simon | Waiter | 5 | 1 |
| Sid Conrad | Dosier, Lou | Chairman | 2 | 1 |
| Tim Haldeman | Dr. Robert Wilson | Bruiser | 1 | 1 |
| Frances Bay | Georgia | Candy | 1 | 2 |
| Alan Blumenfeld | Rob Savage | The Man | 1 | 1 |
| Bibi Besch | Ethel Garvey | Hilary | 1 | 1 |
| Brandon Maggart | Stan Calaus | Coach | 1 | 1 |
| John Cothran, Jr. | Dennis Gant, Sr. | Conductor | 1 | 1 |
| Julie Carmen | Mrs. Lafferty | Theresa | 1 | 1 |
| Lamont Thompson | Paul GIlliam | M.C. Too Big | 1 | 1 |
| Shareen Mitchell | Linda Evans | Claudia Stone | 1 | 1 |
| Stephen Lee | Mr. Dressler | Bruiser | 1 | 1 |
| Pat Millicano | Mr. Hahn | Ned | 1 | 2 |
| Dona Hardy | Freda, Harriet | Lena | 2 | 1 |
| Jean Sincere | Gladys | Mrs. Albrecht | 1 | 1 |
| Jennifer McComb | Cindy Patterson | Jennifer | 1 | 1 |
| Mark Sivertsen | Dan Ferkich | Damien | 1 | 1 |
| Sam McMurray | Mike Landry | Mark Harper | 1 | 1 |
| Scott Bryce | Sobriki's Caseworker | Steve Barton | 1 | 1 |
| Ken Lerner | Harry Stopak, Stan Seidel | Leonard Marshall | 2 | 1 |
| Brenda Ballard | Barb Weston | Nurse | 1 | 1 |
| Carlease Burke | Policewoman | Nurse #2 | 1 | 1 |
| Mary Pat Gleason | Anne Parks | Diane | 1 | 1 |
| Michael Andrew Kelly | Cop #1 | Carl | 1 | 1 |
| Ria Pavia | Stanford Candidate | Laurie | 1 | 1 |
| Ric Mancini | Gasmer | Joe Rossini | 1 | 1 |
| Tony Longo | Angel Dust Junkie | Bruiser at Pool Table | 1 | 1 |
| William Utay | Dr. Lassally | Jim | 1 | 1 |
| Billye Ree Wallace | Helen 'Silvie' Rubadoux | Woman | 3 | 1 |
| Al Ruscio | Mr. Dellanova | Joseph | 1 | 1 |
| Cherie Franklin | Cashier | WAC | 1 | 1 |
| Denise Gentile | Botox Lady | Heather | 1 | 1 |
| Dick Miller | Mr. Ackerman | Motel Manager | 1 | 1 |
| John Hostetter | Burke Newton | Satch | 1 | 1 |
| Mindy Seeger | Barbara Leeman | Waitress | 1 | 1 |
| Tom Troupe | Tancred Baumgartner | Father Marconi | 1 | 1 |
| Bill Stevenson | Clerk | Young Man | 1 | 1 |
| Dean Hill | Lew Reicher | Leonard Tibbs | 1 | 1 |
| Donna Ponterotto | Pearl | Theresa Rossini | 1 | 1 |
| Mik Scriba | James' Father | Chauffeur | 1 | 1 |
| Vera Lockwood | Mrs. McCourt | Mrs. Napoli | 1 | 1 |
| Janice Kent | Mrs. Skinner | Laurie | 1 | 1 |
| Marji Martin | PCP Woman | Marge | 1 | 1 |
| Harris Laskawy | Siebert | Sid | 1 | 1 |
| Cynthia Graham | Ann Ferguson | Student #2 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.