"Steal My Sunshine" is a song by Canadian alternative rock band Len from their third studio album, You Can't Stop the Bum Rush (1999).

It was later released to contemporary hit radio as the lead single from You Can't Stop the Bum Rush on June 22, 1999, by Work Group.

"Steal My Sunshine" was one of the first demos recorded for You Can't Stop the Bum Rush, although the song almost remained unreleased due to it not making much of an impression on the band.

An indie pop and dance-pop song, "Steal My Sunshine" features siblings Marc and Sharon Costanzo trading lead vocals.

"Steal My Sunshine" received positive reviews from music critics, who praised its sample usage and considered the song a quintessential summer hit.

It received heavy airplay as a result, causing Sony's subsidiary The WORK Group to push the album's release date from mid-June 1999 to May 25, 1999.

Somewhere between pop and modern rock, this all-about-summer track-featuring a back-and-forth male-to-female vocal-is uplifting, clever, and instantly appealing.

Its melody line, verse construction, and memorable hook make for what should be an absolute breakthrough for this hip, talented act.

"[20] Rob Brunner of Entertainment Weekly rated it a B+, describing it as a 1990s "Don't You Want Me" with a "smiley groove and alternating male/female vocals".

[21] For The Village Voice, Richard Riegel described the song's beat as "McCoy Tyner playing the Kraftwerk songbook, outlined in aural neon.

[25] Retrospectively, the single garnered high praise from AllMusic's Stephen Thomas Erlewine: "Then, there's Len's 'Steal My Sunshine,' as perfect as songs get.

This sun-kissed, sun-bleached blend of hip-hop, pop, disco, post-Beastie Boys cleverness and California culture is a priceless, timeless confection that instantly calls up sweltering, shimmering beaches the second the looped keyboard plays.

It's a monumentally great single...put it this way, if 'Steal My Sunshine' was the last song I ever heard on this earth, I'd die happy — and it shows that mainstream pop can truly be transcendent.

"[26] In 2007, Stylus Magazine ranked the song 13th on its list of the top 50 one-hit wonders, stating that it "perfectly captured that warm, lazy feeling you get when late summer still seems like it could last forever.

[78] In 2022, Australian band The Goon Sax covered the song, released in the deluxe edition of their 2021 album Mirror II.