Cast and Crew

Starring

 * Dan Castellaneta: Homer Simpson, Grampa Simpson, Barney Gumble, Krusty the Clown, Mayor Joe Quimby, Groundskeeper Willie, Sideshow Mel and Hans Moleman
 * Julie Kavner: Marge Simpson, Patty Bouvier, Selma Bouvier, Jacqueline Bouvier, Nelson Muntz (1990-1995)
 * Nancy Cartwright: Bart Simpson, Nelson Muntz, Todd Flanders, Ralph Wiggum, Kearney, Maggie Simpson1and others.
 * Yeardley Smith: Lisa Simpson
 * Hank Azaria2: Moe Szyslak, Clancy Wiggum, Apu Nahasapeemapetilon, Professor Frink, Comic Book Guy, Bumblebee Man and others.
 * Harry Shearer: Mr. Burns, Waylon Smithers, Ned Flanders, Principal Skinner, Reverend Lovejoy, Lenny Leonard and others.

1 Generally, Nancy Cartwright voices Maggie Simpson's sound effects such as squeaks, giggles, burps etc. However, other people have occasionally voiced her as well: Yeardley Smith provided her squeaks early on in the series, Elizabeth Taylor guest voiced as her in "Lisa's First Word", James Earl Jones voiced her in "Treehouse of Horror V", using his Darth Vader voice, Harry Shearer voiced her in "Treehouse of Horror IX", using his Kang voice and Jodie Foster voiced an adult Maggie in "Four Great Women and a Manicure".

2 Azaria did not become a main cast member until Season 2, before then he was credited

Also Starring
 * Pamela Hayden
 * Russi Taylor
 * Tress MacNeille
 * Karl Wiedergott
 * Marcia Wallace
 * Phil Hartman
 * Doris Grau
 * Jess Harnell
 * Jane Kaczmarek
 * George Takei
 * Sara Gilbert
 * Joe Mantegna
 * Jon Lovitz
 * Albert Brooks
 * Marcia Mitzman Gaven
 * Wolfgang Puck
 * Reese Witherspoon
 * Bill Saluga
 * James L. Brooks
 * Robert Pinsky
 * Ron Taylor

Recurring Special Guest Voices
Including cast with 5+ appearances. See List of guest stars for a complete list of characters.
 * Albert Brooks1: Cowboy Bob, Jacques, Brad Goodman, Hank Scorpio, Tab Spangler. (Season 1, 5, 8, 16, The Simpsons Movie)
 * Kelsey Grammer: Sideshow Bob. (Season 1, 3, 5-8, 12, 14, 17, 19-21)
 * Jane Kaczmarek: Judge Constance Harm (Season 13-16, 18, 21)
 * Maurice LaMarche: Additional voices. (Season 6, 16-21)
 * Jon Lovitz: Artie Ziff, Professor Lombardo, Aristotle Amadopolis, Jay Sherman, Llewellyn Sinclair. (Season 1-4, 6, 8, 13, 15, 18, 24)
 * Joe Mantegna: Fat Tony (Season 3, 6-8, 10-14, 16-18, 20-22)
 * Tina Fey: Ms. Cantwell (Season 24)
 * Former
 * Ron Taylor: Bleeding Gums Murphy (Season 1, 2-13)
 * Greg Berg: Additional voices (Season 2, 7-8)
 * Phil Hartman: Troy McClure, Lionel Hutz, Lyle Lanley, many others. (Season 2-10)
 * Jan Hooks: Manjula Nahasapeemapetilon (Season 9-14)
 * Frank Welker2: Santa's Little Helper, other animals. (Season 2-3, 5-8, 11-13)
 * Marcia Wallace: Edna Krabappel (Season 1-25)

1 Credited as "A. Brooks". During season 1, he was credited as "Also Starring".

2 Credited both as "Special Guest Voice" and "Also Starring".

Producers

 * Matt Groening
 * James L. Brooks
 * Sam Simon

Writers

 * David Cohen
 * Al Jean
 * Ian Maxtone-Graham
 * George Meyer
 * Bill Oakley
 * Conan O'Brien
 * Mike Reiss
 * John Swartzwelder
 * Jon Vitti
 * Josh Weinstein
 * John Frink P.S This writer is based on Professor John Frink (The Scienctist)

Former Writers

 * Matt Groening

Showrunners

 * Seasons 1-2: Matt Groening, James L. Brooks & Sam Simon
 * Season 3-4: Al Jean & Mike Reiss
 * Season 5-6: David Mirkin
 * Season 7-8: Bill Oakley & Josh Weinstein
 * Season 9-12: Mike Scully
 * Season 13-present: Al Jean