Nancy Cartwright
is an American voice actress, actress, and comedienne. She is best known for her long-running role as Bart Simpson on the animated television series The Simpsons. Cartwright voices other characters on the show, including Nelson Muntz, Ralph Wiggum, Todd Flanders, Kearney and Database.

In becoming a voice-over artist for animation, she was mentored by Daws Butler. It was at Hanna-Barbera Productions where she began her professional voice acting career (playing Gloria in that studio's animated adaptation of Richie Rich). Outside of The Simpsons, her voice credits since then have included Daffney Gillfin from Snorks, Mindy from Animaniacs and Chuckie Finster from Rugrats (who took over the role in 2002, following the retirement of Christine Cavanaugh).

Among her Disney roles Pistol Pete from Goof Troop, Rufus from Kim Possible and Todd Daring from The Replacements.