Leslie Edward "Les" Claypool (born September 29, 1963) is an American musician and writer, best known as the bassist and lead vocalist of the band Primus. Claypool's playing style on the electric bass mixes tapping, flamenco-like strumming, whammy bar bends, and slapping.

Claypool has also self-produced and engineered his solo releases from his own studio, "Rancho Relaxo". 2006 saw the release of a full-length feature film Electric Apricot written and directed by Claypool as well as a debut novel South of the Pumphouse.