"Anna Sun" is a song by American rock band Walk the Moon, originally for their 2010 album I Want! I Want!. The song was written by band members Adrian Galvin, Nick Lerangis, Nicholas Petricca and Adam Reifsnyder. It was included on the band's 2012 major-label debut album, Walk the Moon. It was released as a commercial single on February 7, 2012.

"Anna Sun" peaked at number 10 on the Billboard Alternative chart and number 20 on the Billboard Rock Songs chart.

Written by lead vocalist Nicholas Petricca and New York-based singer/songwriter Nick Lerangis towards the end of their college career, the song is named after their professor (see here and here) from Kenyon College and is meant to symbolize youth. "It's about college, about maintaining that little bit of being a kid," Petricca said. "Don't be afraid to play."

The band's self-released album I Want! I Want! was recorded by Chris Schmidt and Ben Cochran at Soap Floats Recording Studio in their hometown of Cincinnati, Ohio.

According to the sheet music published at Musicnotes.com by Universal Music Publishing Group, "Anna Sun" is written in the time signature of common time, with a moderate tempo of 72 beats per minute. It is composed in the key of B♭ major and the melody spans a tonal range of G₄ to B♭₅.

"Anna Sun" received positive reviews from critics. In their review of the Walk the Moon album, Dani Beck and Derrick Robertson called the song "sunny, easy, carefree electronic pop" and noted that it was one of the few highlights in a mostly negative album review. Dulce Rosales of recultured.com noted that while "the lyrics are somewhat repetitive, the simplicity helps hook listeners and causes them to sing along even after a single listen." Brian Benton of MVRemix.com was critical on the length of the song, saying that "it’s five and a half minutes long, when it could be just as effective in three."

"Anna Sun" was named the song of the summer in a 2011 Esquire article "30 Summer Songs Every Man Should Listen To". Additionally, the single was also named song of the summer by MTV and Seventeen, as well as one of the best songs of the year by Amazon.

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