"Sweet but Psycho" is a song by American singer Ava Max, released as a single on August 17, 2018 through Atlantic Records. It was co-written by Max along with Madison Love and Cirkut, the latter of whom produced the song. Upon release, it appeared on various Spotify playlists and Viral Charts, and subsequently reached number one in 17 countries including Germany and the United Kingdom, where it stayed at number one for four consecutive weeks.