Kathryn Valentine is an American musician who is the bassist for the rock band the Go-Go's. She has maintained a career in music through songwriting, recording, performing and touring as well as additional academic and creative pursuits. Valentine was inducted into the Rock and Roll Hall of Fame in October 2021 as a member of The Go-Go's.

The Go-Go's were an American all-female rock band formed in Los Angeles in 1978. Except for short periods when other musicians joined briefly, the band has had a relatively stable lineup consisting of Charlotte Caffey on lead guitar and keyboards, Belinda Carlisle on lead vocals, Gina Schock on drums, Kathy Valentine on bass, and Jane Wiedlin on rhythm guitar. They are widely considered the most successful all-female rock band of all time.