Billy Duane Tubbs (March 5, 1935 – November 1, 2020) was an American men's college basketball coach. The Tulsa, Oklahoma native was 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). His first head coaching job — from 1971-72 through 1972-73 — was at Southwestern University, Georgetown, Texas, where his teams were 12–16 and 19–8. From there he went to the University of North Texas to serve as assistant coach under Gene Robbins and for one year under Bill Blakeley.