“Steal My Sunshine” is a song by Canadian band Len, jointly written and composed by band member Marc Costanzo and Gregg Diamond. It was released in July 1999 as the lead single from their third album You Can't Stop the Bum Rush.

The indie pop track became a sleeper hit when radio stations began playing it in March 1999, four months before Len planned to release their album. "Steal My Sunshine" had a commercial single release in July 1999. It received positive reviews from music critics, and its chart success caused Len to be considered a one-hit wonder. The song earned a nomination for "Best Single" at the Juno Awards of 2000.

The backdrop is based on a sample of a short instrumental portion of the "Andrea True Connection's" 1976 disco single "More, More, More," which Diamond wrote and composed specifically for the Connection's lead singer, former porn star Andrea True. Supposedly inspired by The Human League's 1981 synthpop hit "Don't You Want Me," the song's vocals alternate between Marc and Sharon Costanzo. Gregg Diamond, who was given songwriting credit as the original author-composer of "More, More, More," died three months before the album was released.

Marc Costanzo went to a rave during a time when he and his sister Sharon had gone several months without speaking. While out, he was listening to old disco music with Brendan Canning, and heard the Andrea True Connection's "More, More, More." Marc decided to loop part of the song's bridge and wrote and composed "Steal My Sunshine" on that basis. When he returned home, he presented the song to Sharon. The two recorded it on an 8-track 1/2 inch recorder, and she threw the reel in a closet. Marc stated that "Steal My Sunshine" did not make much of an impression on him, so Len did not originally plan to include it on You Can't Stop the Bum Rush. The master recording was under his bed, so the group was almost unable to find the song.

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