I Against I is the third studio album by the American rock band Bad Brains. It was released on November 21, 1986 through SST Records with the catalog number SST 065. The best-selling album in the band's catalog, I Against I finds the band branching out from their early hardcore punk style to touch on funk, soul, reggae and heavy metal. It is also included in the book 1001 Albums You Must Hear Before You Die. The title track was a Paul Rachman-directed video.

Bad Brains are an American band formed in Washington, D.C., in 1976. They are widely regarded as pioneers of hardcore punk, though the band's members have objected to the use of this term to describe their music. They are also an adept reggae band, while later recordings featured elements of other genres like funk, heavy metal, hip hop, and soul. Rolling Stone magazine called them "the mother of all black hard-rock bands", and they have been cited as a seminal influence to numerous other subgenres in addition to hardcore punk, including various subgenres of heavy metal, such as thrash/speed metal, alternative metal, and funk metal. Bad Brains are followers of the Rastafari movement.