Cast and crew

Cast

¹ Generally Nancy Cartwright voices Maggie Simpson's squeaks, giggles and burps. 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 guest 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.

Pamela Hayden: Milhouse Van Houten, Rod Flanders, Jimbo Jones, Sarah Wiggum, Janey Powell, many others. (Season 1-20)
Tress MacNeille: Agnes Skinner, Dolph Starbeam, Crazy Cat Lady, Cookie Kwan, Brandine Spuckler, many others. (Season 1-20)
Maggie Roswell: Helen Lovejoy, Maude Flanders, Elizabeth Hoover, Luann Van Houten, Mary Bailey, many others. (Season 1-11, 13-20)
Russi Taylor: Martin Prince, Sherri and Terri, Üter. (Season 1-20)
Karl Wiedergott: Additional voices. (Season 10-20)

Including cast with 5+ appearances. See List of guest stars for a complete list

Greg Berg: Additional voices (Season 2, 7-8)
Albert Brooks¹ : Cowboy Bob, Hank Scorpio, Jacques, Tab Spangler. (Season 1, 5, 8, 16)
Phil Hartman: Troy McClure, Lionel Hutz, Lyle Lanley, many others. (Season 2-10)
Jan Hooks: Manjula Nahasapeemapetilon (Season 9-14)
Jane Kaczmarek: Judge Constance Harm (Season 13-16, 18)
Jon Lovitz: Artie Ziff, Professor Lombardo, Aristotle Amadopolis, Jay Sherman, Llewellyn Sinclair. (Season 1-4, 6, 8, 13, 15, 18)
Frank Welker²: Santa's Little Helper, other animals. (Season 2-3, 5-8, 11-13)

¹ Credited as "A. Brooks". During season 1, he was credited as "Also Starring".
² Credited both as "Special Guest Voice" and "Also Starring".