Susan Kay "Suzi" Quatro (born 3 June 1950) is a British-based American singer-songwriter, bass guitar player, and actor. She is the first female bass player to become a major rock star. This broke a barrier to women's participation in rock music.

In the 1970s Quatro scored a string of hit singles that found greater success in Europe and Australia than in her homeland. But, following a recurring role as a female bass player on the popular American sitcom Happy Days, her duet "Stumblin' In" with Chris Norman reached number 4 in the USA in 1979.