"Bad Guy" is a song by American hip hop recording artist Eminem, taken from his eighth album The Marshall Mathers LP 2 (2013). The song connects the second Marshall Mathers LP to the first, which was released in the year 2000. "Bad Guy" is also a sequel to Eminem's hit single "Stan", which appears on the aforementioned album.

The song, produced by S1, M-Phazes, StreetRunner and Vinny Venditto, was written by the four alongside Eminem, S. Hacker, M. Aiell and Sarah Jaffe, the latter of which is featured singing the song's refrain. The song samples "Hocus Pokus", as performed by Walter Murphy and "Soana", written by Gian Piero Reverberi and Laura Giordano; as well as "Ode to Billie Joe", as performed by Lou Donaldson.

"Bad Guy" was met with universal acclaim from music critics, with the most praise going towards the song's storytelling. It debuted at number 38 on the US Billboard Hot R&B/Hip-Hop Songs, upon the album's release.

In "Bad Guy", Eminem plays the role of Matthew Mitchell, the little brother of the Eminem character portrayed in The Marshall Mathers LP single, "Stan". The song "Stan" recounts the story of a crazy fan named Stan, who kills himself, his girlfriend and their unborn child because Eminem was not responding to his letters, until it was too late. On "Bad Guy," Stan's brother Matthew is older now and wants revenge against Eminem. Eminem sees Matthew "skulking around his driveway with a knife and in a novelistic flourish, he details that Matthew's "mouth is full of saliva" as he circles the house." Matthew then kidnaps Eminem, throws him in the trunk of his car, and then drives around Detroit listening to The Marshall Mathers LP. Just like in "Stan" Eminem raps the second to last verse in his perspective. Throughout the song he also makes references back to "Stan" and The Marshall Mathers LP. Into the second part of the song, the production fades out and Eminem battles his alter-ego Slim Shady in his head.

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