"Girl's Not Grey" is a song by American rock band AFI. It was released as the debut single from their sixth studio album Sing the Sorrow in 2003. "Girl's Not Grey" was released to radio on February 4, 2003. It is the band's third most successful single, peaking at #7 on the Alternative Songs Chart and #14 on the Bubbling Under Hot 100 Chart. A music video directed by David Slade was made for the song.

It is a playable track in the video games Rock Band 2 and Guitar Hero Live, and a downloadable track for the video game Guitar Hero 5 and the iPod Touch application Tap Tap Revenge.

"Girl's Not Grey" received generally positive reviews from critics, who considered it a pop punk song from the album. Allmusic reviewer Johnny Loftus felt that the chorus of the backing voices shifted the song from hardcore punk to pop, and called the single "a car-radio singalong of pure genius".

A music video directed by David Slade was released shortly after the single's release. According to the Fuse TV program IMX, the video is similar to Slade's previously directed music video, "Sour Girl" by Stone Temple Pilots, featuring a strange environment and human-sized rabbit characters as well. The music video is similar to Lewis Carroll's novel Alice's Adventures in Wonderland, featuring a little girl that follows a rabbit into an alternate reality.

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