"September" is a song by the American band Earth, Wind & Fire released as a single in 1978 on ARC/Columbia Records. Initially included as a track for The Best of Earth, Wind & Fire, Vol. 1, "September" was very successful commercially and reached No. 1 on the US Billboard Hot R&B Songs chart, No. 8 on the US Billboard Hot 100, and No. 3 on the UK Singles Chart. The song remains a staple of the band's body of work and has been sampled, covered, remixed, and re-recorded numerous times.

It was added to the Library of Congress' National Recording Registry list of sound recordings that "are culturally, historically, or aesthetically important" in 2018.