| William Kavanaugh | |
| Birth Place: | Dartmouth, Massachusetts, U.S. |
| Player Positions: | Offensive lineman |
| Alma Mater: | Stonehill College (1972) |
| Coach Years1: | 1973–? |
| Coach Team1: | Bishop Stang HS (MA) (assistant) |
| Coach Years2: | ?–1989 |
| Coach Team2: | Dartmouth HS (MA) (assistant) |
| Coach Years3: | 1990–2006 |
| Coach Team3: | Southeastern Massachusetts / UMass Dartmouth |
| Coach Years4: | 2007–2011 |
| Coach Team4: | Bishop Stang HS (MA) |
| Overall Record: | 104–64 (college) 18–36 (high school) |
| Bowl Record: | 1–2 |
| Tournament Record: | 0–1 (NCAA D-III playoffs) |
| Championships: | 2 NEFC (1994, 2002) |
| Awards: | 3× NEFC Coach of the Year (1996, 1998, 2002) Corsair Athletic Hall of Fame (2011) |
William Kavanaugh Sr. (born) is a former American football coach. He was most recently the head coach for the Bishop Stang High School football team.[1] He was previously an assistant coach for Dartmouth High School before becoming the head coach for the UMass Dartmouth Corsairs football team from 1990 to 2006. He was inducted into the Corsair Hall of Fame in 2011.[2] He is the father of former Bentley Falcons football team head coach Bill Kavanaugh.[3]