"September" is a song by American funk band Earth, Wind & Fire, written by Maurice White, Al McKay, and Allee Willis. It was recorded during the I Am sessions and released as a single in 1978. Featured on the band's album The Best of Earth, Wind & Fire, Vol. 1, "September" reached number one on the US R&B chart, number eight on the Billboard Hot 100, and number three on the UK singles chart.

White's unusual lyrics for the chorus were debated by Willis: "I said, 'We are going to change 'ba-dee-ya' to real words, right?' ... I learned my greatest lesson ever in songwriting from him, which was never let the lyric get in the way of the groove."

The song was certified silver by the British Phonographic Industry and certified gold in the US (Until the RIAA lowered the sales levels for certified singles in 1989, a Gold single equaled 1 million units sold.) "September" was later certified Gold for digital sales by the RIAA. The song was also later released as "December", chord changes & melody remained identical, with lyrics re-written for the "...Twenty-fifth of December...", performed by Earth Wind & Fire, as well, on a later album.

^*sales figures based on certification alone
^{^}shipments figures based on certification alone

The information regarding accolades attributed to September ' is adapted from AcclaimedMusic.net.

(*) designates lists that are unordered.

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