"The Devil in I" is a single by American metal band Slipknot from their fifth album, .5: The Gray Chapter. It is the second single for the album and the first to be released to radio and music channels, with the previous single "The Negative One" being a digital only single.

In an interview with Loudwire, singer Corey Taylor revealed that the bass player and drummer would both be on stage and both would wear the same mask, as the band felt it would be disrespectful for them to have individual masks at that time.

Shortly after the reveal of "The Negative One", another countdown was put up on Slipknot's official website telling fans to come back on August 11, 2014 at 10am PDT for "A special announcement". The announcement was delayed but eventually revealed the cover art for the new single titled "The Devil in I". This was disappointing for some fans as Corey Taylor had already revealed the title of the single in an interview for BBC Radio 1 on August 4.

Blabbermouth.net noted that the single "chugs out of a warbling doom line at the beginning and sets itself onto a morose but tuneful course with moody guitar chimes, dirge-loaded bass and empathetic swills from Corey Taylor," as well as noting that "The choruses are a little too safe, but a massive and quick-stepped breakdown plus a grinding bridge thereafter keeps the song robust and hectic."

Plans for a music video for the song were revealed by Corey Taylor during an interview for BBC Radio 1. The band put out a casting call asking for "human maggots" for a video that was shot on August 22 and 23, 2014. They requested people between the ages of 20 and 35 with the condition they be okay with filming barefoot.

On September 11, 2014, Slipknot uploaded a trailer for The Devil in I music video to be uploaded the next day; the trailer featured two people in red shrouds with eye-holes cut out. The video was uploaded on September 12 and featured the band members in a mental asylum surrounded by fans dancing in straitjackets while the band performed. It also featured Corey in his All Hope Is Gone masks and Clown in his Iowa mask. Chris Fehn is also seen in his Memorial World Tour mask.

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