"Ain't No Sunshine" is a song by Bill Withers from his 1971 album Just As I Am, produced by Booker T. Jones. The record featured musicians Donald "Duck" Dunn on bass guitar, Al Jackson, Jr. on drums and Stephen Stills on guitar. String arrangements were done by Booker T. Jones, and recorded in Memphis by engineer Terry Manning. The song is in the key of A minor.

The song was released as a single in 1971, becoming a breakthrough hit for Withers, reaching number six on the U.S. R&B Chart and number three on the Billboard Hot 100 chart. Billboard ranked it as the No. 23 song for 1971. The song also appears on the original soundtrack album for the film When We Were Kings (1997), and in FX's first season (2016) of the anthology limited series American Crime Story, which focuses on the 1994 murder trial of O. J. Simpson.

Withers was inspired to write this song after watching the 1962 movie Days of Wine and Roses. He explained, in reference to the characters played by Lee Remick and Jack Lemmon, "They were both alcoholics who were alternately weak and strong. It's like going back for seconds on rat poison. Sometimes you miss things that weren't particularly good for you. It's just something that crossed my mind from watching that movie, and probably something else that happened in my life that I'm not aware of."

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