"Flesh Into Gear" is a song by American heavy metal band CKY. Written by band members Deron Miller, Chad I Ginsburg and Jess Margera, and produced by Ginsburg, it is featured on the band's 2002 second studio album Infiltrate•Destroy•Rebuild. The song was released as a single in 2002, reaching number 38 on the US Billboard Mainstream Rock chart.

As with the rest of the Infiltrate•Destroy•Rebuild album, writing for "Flesh Into Gear" was credited to vocalist and guitarist Deron Miller, guitarist Chad I Ginsburg and drummer Jess Margera. Prior to its release in 2002, the song was recorded as a demo under the title "Sinking Fast" and featured on the second CKY video, CKY2K, released in 2000.

Billboard magazine described the overall atmosphere of "Flesh Into Gear" as "anthemic". However, a review of Infiltrate•Destroy•Rebuild on Sputnikmusic labelled the song as "negative", noting an "upbeat-yet-stoneresque rhythm" at the beginning of the track.Spin magazine related the song to the band's link with skateboarding and stunt videos, describing it as "elbow-scraping rock".

PopMatters writer Nikki Tranter proposed that the lyrics of the song saw singer Miller "relating his band’s vision for its future", citing lines such as "A simple sound/A heavy side/Could win the whole world over".

In addition to its original release on the album Infiltrate•Destroy•Rebuild in September 2002, "Flesh Into Gear" was also featured on the film Jackass: The Movie in October that year, and included on its soundtrack album. It was released as a single to promote both albums that year, and became the first single release by the band to chart when it reached number 38 on the US Billboard Mainstream Rock chart. In 2015, it was included on the compilation album The Best of CKY.

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