(born October 25, 1957 in Dayton, Ohio) has been doing cartoon voices since Hanna-Barbera's version of Richie Rich in the early 1980s (after being personally trained by the legendary Daws Butler), but is probably best known the world over for her voice work on the long-running FOX animated sitcom The Simpsons, where she is not only the voice of devious prankster Simpsons son, Bart, but also the voice of Ned Flanders' son Toddnote , dim-witted second grader (and son of the town's incompetent police chief) Ralph Wiggum, fourth-grade bully Nelson Muntz, over-aged elementary school bully, petty thug, and (allegedly) teenaged father Kearney Zzyzwicznote , and provides vocal effects (cooing, crying, and laughing) for youngest Simpsons child, Maggie. In addition, Cartwright is also an animation producer, responsible for NASCAR.com's Web Animation series The Kellys. She has adapted her book, My Life as a 10-Year-Old Boy, into an audiobook and a one-woman stage show.Cartwright has also appeared in live action, including Joe Dante's segment of Twilight Zone: The Movie, a guest appearance on Cheers, the Made-for-TV Movie Marian Rose White, and the first American Godzilla movie (which also featured her Simpsons co-stars Hank Azaria and Harry Shearer), as well as making a guest appearance on an episode of 24 (the same season, stars Kiefer Sutherland and Mary Lynn Rajskub returned the favor by reprising their roles from 24 for a guest appearance on The Simpsons). Originally, she was going to do voice work on South Park, but turned it down due to its vulgar content. She even was a celebrity guest on Tom Bergeron's The Hollywood Squares and Donny Osmond's Pyramid.
Outside show business, Cartwright is a prominent member of the Church of Scientology.
Cartwright has done character voices for the following works:
- Richie Rich (1980): Gloria Glad
- Shirt Tales: Kip Kangaroo (season 2 only)
- The Snorks: Daffney Gilphin
- Popeye and Son: Woody
- Saturday Supercade: Kimberly (season 2 only, in "Space Ace" segments)
- Galaxy High: "Flat" Freddy Fender, Gilda Gossip
- Animaniacs: Mindy, additional voices
- The Simpsons: Bart Simpson, Ralph Wiggum, Nelson Muntz, Kearney (the bully who looks like a teenager, but isn't), Todd Flanders, and any one-shot boy characters.
- Cartwright also provides vocal effects (mostly cooing, laughing and crying) for Maggie Simpson and was the replacement voice for Elizabeth Taylor when the season 13 episode of The Simpsons showed a clip from season 4's "Lisa's First Word", where Maggie finally says her first word "Daddy" after Homer wishes that she never speak.
- Rugrats: Chuckie Finster (season 8 onward)
- Goof Troop: Pistol Pete
- The Critic: Margo Shermannote , various
- Kim Possible: Rufus
- The Replacements: Todd Daring
- Mike, Lu & Og: Princess Lu
- Putt-Putt: Putt-Putt (Enters the Race, Joins the Circus, and One-Stop Fun Shop only)
- My Little Pony: The Movie (1986) and My Little Pony 'n Friends: Gusty the unicorn, Posey the earth pony, Truly the earth pony
- Pound Puppies (1980s): Bright Eyes
- Bonkers: Fawn Deer
- Toonsylvania: Melissa Screetch
- Fantastic Max: FX
