William Warren Fenley (February 8, 1922 – January 18, 2009) was a professional basketball player who spent one season in the Basketball Association of America (BAA) as a member of the Boston Celtics (1946–47). He attended Port Richmond High School on the North Shore of Staten Island and later Manhattan College. After his BAA career was over he funded the construction of a school and athletic program from Saint Rita Roman Catholic Church in Brooklyn. In 1964, he was the first head coach for Monsignor Farrell High School boys' basketball team. He was a marine.