Nancy Jean Cartwright is an American actress. She is the long-time voice of Bart Simpson on the animated television series The Simpsons, for which she has received a Primetime Emmy Award for Outstanding Voice-Over Performance and an Annie Award for Best Voice Acting in the Field of Animation. Cartwright also voices other characters for the show, including Ralph Wiggum, Todd Flanders, Nelson Muntz, and Maggie. She is also the voice of Chuckie Finster in the Nickelodeon series Rugrats and its spin-off All Grown Up!, succeeding Christine Cavanaugh.

Bartholomew Jojo "Bart" Simpson is a fictional character in the American animated television series The Simpsons and part of the Simpson family. He is voiced by Nancy Cartwright and first appeared on television in The Tracey Ullman Show short "Good Night" on April 19, 1987. Cartoonist Matt Groening created and designed Bart while waiting in the lobby of James L. Brooks' office. Groening had been called to pitch a series of shorts based on his comic strip, Life in Hell, but instead decided to create a new set of characters. While the rest of the characters were named after Groening's family members, Bart's name is an anagram of the word brat. After appearing on The Tracey Ullman Show for two years, the Simpson family received its own series on Fox, which debuted December 17, 1989. Bart has appeared in every Simpsons episode except "Four Great Women and a Manicure".