| Brian Mahoney | |
| Height Ft: | 6 |
| Height In: | 3 |
| Weight Lb: | 175 |
| Birth Date: | 17 December 1948 |
| Birth Place: | Rockville Centre, New York, U.S. |
| High School: | Saint Agnes (Rockville Centre, New York) |
| College: | Manhattan (1968–1971) |
| Draft Year: | 1971 |
| Draft Round: | 5 |
| Draft Pick: | 69 |
| Draft Team: | Cleveland Cavaliers |
| Career Start: | 1972 |
| Career End: | 1973 |
| Career Number: | 21 |
| Career Position: | Shooting guard |
| Coach Start: | 1973 |
| Coach End: | 1996 |
| Years1: | – |
| Team1: | New York Nets |
| Cyears1: | 1973–1978 |
| Cteam1: | St. John's (assistant) |
| Cyears2: | 1978–1981 |
| Cteam2: | Manhattan |
| Cyears3: | 1981–1992 |
| Cteam3: | St. John's (assistant) |
| Cyears4: | 1992–1996 |
| Cteam4: | St. John's |
| Highlights: | As coach:
|
| Cstats League1: | NCAA |
| Cwin1: | 72 |
| Closs1: | 120 |
| Bbr: | mahonbr01 |
Brian Mahoney (born December 17, 1948) is an American retired college basketball coach and former professional player. He was head coach of the St. John's Red Storm team from 1992 to 1996, as well as the Manhattan Jaspers from 1978 to 1981.
Mahoney played collegiately at Manhattan College. A 6'3", 175-pound shooting guard, he was drafted in 1971 by the Cleveland Cavaliers in the fifth round of that year's NBA draft; however, he played instead in the rival American Basketball Association as a member of the New York Nets (now the NBA's Brooklyn team) for only 19 games in the 1972–73 season. That was the only time he played professionally. After that he went into coaching.