William Sheehan (born March 19, 1953) is an American musician known for his work with Talas, Steve Vai, David Lee Roth, Mr. Big, Niacin, and The Winery Dogs. He has won the "Best Rock Bass Player" readers' poll from Guitar Player magazine five times for his "lead bass" playing style. Sheehan's repertoire includes the use of chording, two-handed tapping, right-hand "three-finger picking" technique and controlled feedback.