William Raymond Brennan
- Bats Right, Throws Right
- Height 6' 3", Weight 200 lb.
- School Mercer University
- High School Hillwood High School
- Debut July 19, 1988
- Final Game October 2, 1993
- Born January 15, 1963 in Tampa, FL USA
Pitcher William Brennan is not to be confused with Bill Brennan, an umpire from the 1910s and Will Brennan an outfielder from the 2020s. William pitched in parts of two seasons: 1988 with the Los Angeles Dodgers and 1993 with the Chicago Cubs. In 12 games, he was 2-2 with a 5.18 ERA.