Actors in both 30 Rock and The Simpsons
60 actors have appeared in both 30 Rock and The Simpsons, across 940 episodes. The most-credited is Kelsey Grammer, Kelsey Grammer in 30 Rock and Sideshow Bob in The Simpsons.
| Actor | In 30 Rock | In The Simpsons | Eps | Eps |
|---|---|---|---|---|
| Kelsey Grammer | Kelsey Grammer | Sideshow Bob | 3 | 23 |
| Chris Parnell | Dr. Leo Spaceman, Dr. Heinrich Spaceman, The Lovebirds Announcer | Fiancé | 23 | 1 |
| Elizabeth Banks | Avery Jessup | Persephone Odair | 15 | 1 |
| Rachel Dratch | Greta Johanssen, Blue Man, Barbara Walters | Doctor | 14 | 1 |
| Will Forte | Paul L'Astnamé, Tomas | King Toot | 12 | 3 |
| Jackie Mason | Jackie Mason | Rabbi Hyman Krustofski | 1 | 12 |
| Kristen Schaal | Hazel Wassername, The Joey Montero Show Dancer | Louise Belcher, Taffy | 11 | 2 |
| Megan Mullally | Bev | Sarah Wiggum | 3 | 6 |
| Jan Hooks | Verna Maroney | Manjula | 2 | 6 |
| Jon Hamm | Dr. Drew Baird, Abner, David Brinkley | FBI Investigator | 7 | 1 |
| Stacy Keach | Stacy Keach | Howard K. Duff VII, Don Bookner, Duff the 8th | 1 | 7 |
| Steve Buscemi | Lenny Wosniak | Dwight | 6 | 1 |
| Hannibal Buress | Bum, Hannibal | Principal Finch | 9 | 1 |
| Fred Armisen | Frank Stand-In, Raheem Haddad, Telethon Woman | Terrence | 2 | 2 |
| Julianne Moore | Nancy Donovan | Consonance | 7 | 1 |
| Patti LuPone | Sylvia Rossitano | Cheryl Monroe | 3 | 1 |
| Tracy Morgan | Gov. Bob Dunston, Nipsey, Theodore Freeman/Alfie | Tow Truck Driver, Tracy Morgan | 2 | 2 |
| Amy Poehler | Young Liz | Jenda | 1 | 2 |
| Betty White | Betty White | Betty White | 1 | 2 |
| Bill Hader | Kevin | Manacek, Slava | 1 | 2 |
Cast data from TVmaze, licensed CC BY-SA 4.0.