Billy Tubbs (born March 5, 1935 ) is a former men's college basketball coach. The Tulsa, Oklahoma native has been the head coach of his alma mater Lamar University (1976-1980, 2003-2006), the University of Oklahoma (1980-1994) and Texas Christian University (1994-2002).

Tubbs was known for his high scoring offense and full-court press defense.

Tubbs achieved many coaching milestones during his coaching career. He became the ninth coach in NCAA history to record 100 wins at three different schools (Oklahoma 333, TCU 156 and Lamar 121). He became the 28th coach in NCAA Division I history to record 600 wins in Lamar's 79-67 win over Texas Southern during the 2003-04 season.

In 31 years of coaching, Tubbs compiled a 641-340 (.653) career record, including a 121-89 record in seven years at Lamar. He guided 12 teams to NCAA Tournament appearances, six National Invitation Tournament appearances, eight conference championships, three conference tournament championships and 18 20-win seasons. His 641 wins ranks 34th all-time in NCAA history.

In March of 2006, Tubbs resigned as head coach of Lamar but remains the athletic director of the school. He was succeeded by Steve Roccaforte.