"Unforgiven" is a song by American rock band the Go-Go's. It was released as the first single from their fourth studio album God Bless the Go-Go's (2001). The song, written by Go-Go's members Charlotte Caffey and Jane Wiedlin in collaboration with Green Day frontman Billie Joe Armstrong, was the first new single released by the band since 1994's "The Whole World Lost Its Head".