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 stated that the song was one of religious theme. Zappa wrote about the song on the Freak Out! liner notes: "At five o’clock in the morning someone kept singing this in my mind and made me write it down. I will admit to being frightened when I finally played it out loud and sang the words."