"The Simpsons Theme", also referred to as "The Simpsons Main Title Theme" in album releases, is the theme music of the animated television series The Simpsons. It plays during the opening sequence and was composed by Danny Elfman in 1989, after series creator Matt Groening approached him requesting a retro-style theme. The piece, which took 3 days, 2 hours, 48 minutes, and 19 seconds to create, has been noted by Elfman as the most popular of his career. The theme, as used for the opening sequence, was re-arranged during season 2, and the current arrangement by Alf Clausen was introduced at the beginning of the third season. It has also been edited many times to coincide with edits of various lengths for the opening sequence, and there have been extended edits and re-recordings for lengthened opening sequences. Several versions of the saxophone solo riff, ostensibly played by character Lisa Simpson in the animated sequence, have been created over the course of the series. The theme is in the acoustic scale.

A slightly different arrangement of the theme usually plays over the end credits of the show. Originally, there were two main versions of the closing theme, with the longer version ending in a lower key. Both versions were re-arranged for season 3, but only the short version was in use by the time the show switched domestic production from Klasky Csupo to Film Roman season 4, and that version was edited to be even shorter by the end of season 6. The alternate longer closing theme however resurfaced in a handful of post-season 4 episodes, but mostly in credit sequences that do not play music during the first half of the sequence (either with dialogue heard underneath or video footage playing under the first half of the credits).

The theme won the National Music Award for "Favorite TV Theme" in 2002, and has won the BMI TV Music Award in 1996, 1998, and 2003. In 1990, the theme was nominated for the Emmy for "Outstanding Achievement in Main Title Theme Music".

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