"Island in the Sun" is a song by the American rock band Weezer. It is the second single from the band's second self-titled album Weezer, released in 2001. "Island in the Sun" was not originally planned to be on the album, but producer Ric Ocasek fought for its inclusion. It was a successful radio single and perhaps the band's biggest hit ever outside of the United States, reaching No. 31 in the UK and No. 17 in France. In January 2002, the Australian Triple J Hottest 100 ranked the song 7 in its 2001 countdown.^[1] "Island in the Sun" is also the most-licensed track in the Weezer catalog.^[2] In 2009, Pitchfork named it the 495th greatest song of the 2000s.^[3]

In late 2001, the band reworked the song's solo for their live show. In 2005, lead singer Rivers Cuomo would often open the band's encore by playing "Island in the Sun" alone on an acoustic guitar in the back of the venue they were playing.

"Island in the Sun" is an alternative rock^[4] and power pop song^[5] that is about three minutes and twenty seconds.^[6] According to the sheet music published at Musicnotes.com by Hal Leonard Music, it is written in the time signature of common time, with a moderate tempo of 114 beats per minute.^[6] "Island in the Sun" is composed in the key of G major, while Rivers Cuomo's vocal range spans just over an octave, from the low note of F♯₃ to the high note of G₄.^[6] It follows the vi–ii–V–I progression, utilising the chords of E minor, A minor, D major and G major.

Melissa Bobbitt at About.com ranked "Island in the Sun" as the 12th best Weezer song, saying it "exemplified a relaxed Southern California spirit".^[7] It was named as one of the 12 best post-Pinkerton Weezer songs by The A.V. Club, where they refer to it as "...a reminder that Cuomo really does deserve Brian Wilson comparisons for reasons beyond being a hermetic weirdo with a solid grasp of pop songcraft".^[8] Emily Tartanella of Magnet considers it the most overrated Weezer song, stating it should be "retired" from commercials and radio stations. Tartanella describes it as "so laid back it's practically catatonic".^[9]

There are two different videos for "Island in the Sun".

An erroneous short mix of "Always" ended up on the singles, and the correct mix (2:48) was released as an MP3 on the band's website.