All 60 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 |
| Conan O'Brien | Conan O'Brien | Conan O'Brien | 2 | 1 |
| Jack McBrayer | 1969 NBC News Assistant, Female Audience Member, Male Audience Member | Ewell Freestone | 2 | 1 |
| Julia Louis-Dreyfus | Liz Lemon | Gloria | 1 | 2 |
| Kristen Wiig | Candace Van der Shark | Annie Dubinsky, Ms. Juniper | 1 | 2 |
| Tony Bennett | Tony Bennett | Tony Bennett | 1 | 2 |
| Alec Baldwin | Richard Nixon, Chet Huntley, Cubby Gilmore/Larry | Caleb Thorn | 4 | 1 |
| Michael Sheen | Wesley Snipes | William Masters | 4 | 1 |
| Al Roker | Al Roker | Al Roker | 3 | 1 |
| Amy Sedaris | Visor Lady | Maggie Simpson | 1 | 1 |
| Aubrey Plaza | Page | Amber Duffman | 1 | 1 |
| Bobby Moynihan | Stewart Derr | Tyler Boom | 1 | 1 |
| John Slattery | Steven Austin | Robert Marlowe | 1 | 1 |
| Michael Keaton | Tom | Hal Julian, Jack | 2 | 2 |
| Molly Shannon | Katherine Catherine | Katya | 1 | 1 |
| Victor Garber | Eugene Gremby | Michael de Graaf | 1 | 1 |
| "Weird Al" Yankovic | Weird Al Yankovic | Weird Al Yankovic | 1 | 2 |
| Adam West | Adam West | Adam West, Batman | 1 | 2 |
| Isabella Rossellini | Bianca Donaghy | Astrid Weller | 2 | 1 |
| John Lithgow | John Lithgow | Augustus Redfield, John Lithgow | 1 | 2 |
| Larry King | Larry King | Larry King | 1 | 2 |
| Susan Sarandon | Lynn Onkman | Ballet Teacher | 2 | 1 |
| Tina Fey | Jamie Garnett, Loretta Fields/Doris, The Gruber Brother and Nipsey Actor | Ms. Cantwell | 2 | 1 |
| Amy Schumer | Stylist | Mrs. Burns | 1 | 1 |
| Andrea Martin | Bonnie | Apu's Mother | 1 | 1 |
| Don Cheadle | Don Cheadle | Brother Faith | 1 | 1 |
| Don Pardo | Sid | Don Pardo | 1 | 1 |
| Jane Krakowski | Dusty Springfield | Zhenya | 1 | 1 |
| Nicole Byer | Mo'Nique Lookalike | Erica | 1 | 1 |
| Phil Rosenthal | Phil Rosenthal | Phil Rosenthal | 1 | 1 |
| Rachel Maddow | Rachel Maddow | Rachel Maddow | 1 | 1 |
| Regis Philbin | Regis Philbin | Regis Philbin | 1 | 1 |
| Steve Martin | Gavin Volure | Ray Patterson | 1 | 1 |
| Tim Conway | Bucky Bright | Tim Conway | 1 | 1 |
| Bryan Cranston | Ron | Stradivarius Cain | 1 | 1 |
| Elvis Costello | Elvis Costello | Elvis Costello | 1 | 1 |
| Suze Orman | Suze Orman | Suze Orman | 1 | 1 |
| Tim Meadows | Martin Lutherking | Tim Meadows | 1 | 1 |
| Tom Hanks | Tom Hanks | Tom Hanks | 1 | 1 |
| Cristin Milioti | Abby Flynn | Barbara Belfry | 1 | 2 |
| John Early | Jerome | Joel | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.