"Who Are the Brain Police?" is a Frank Zappa song, performed by The Mothers of Invention, released on the Mothers' debut album, Freak Out!. It was released by Verve Records as a single in 1966. Zappa said the song had a religious theme, according to one source.

Freak Out! is the debut studio album by American rock band the Mothers of Invention, released on June 27, 1966, by Verve Records. Often cited as one of rock music's first concept albums, it is a satirical expression of frontman Frank Zappa's perception of American pop culture and the nascent freak scene of Los Angeles. It was also one of the earliest double albums in rock music, as well as the first two-record debut album. In the UK, the album was originally released as an edited single disc.