| Birth Date: | 18 November 1964 |
| Birth Place: | Meridian, Mississippi, U.S. |
| Number: | 65 |
| Status: | Retired |
| Import: | yes |
| Position1: | Guard |
| College: | Fresno State |
| High School: | Lemoore |
| Nfldraftedyear: | 1988 |
| Nfldraftedround: | 5 |
| Nfldraftedpick: | 119 |
| Nfldraftedteam: | New York Jets |
| Playing Years1: | 1988–1989 |
| Playing Team1: | New York Jets |
| Playing Years2: | 1990; 1991* |
| Playing Team2: | San Diego Chargers |
| Playing Years3: | 1991 |
| Playing Team3: | Pittsburgh Steelers |
| Playing Years4: | 1991–1992 |
| Playing Team4: | Cincinnati Bengals |
| Playing Years5: | 1993 |
| Playing Team5: | San Diego Chargers |
| Playing Years6: | 1994* |
| Playing Team6: | Cleveland Browns |
| Playing Team7: | Baltimore Stallions (CFL) |
| Playing Team8: | Montreal Alouettes (CFL) |
| Playing Years9: | 1997* |
| Playing Team9: | San Diego Chargers |
| Playing Team10: | BC Lions (CFL) |
| Career Highlights: | |
| Cflallstar: | , |
| Awards: | 1995 - Leo Dandurand Trophy |
| Databasefootball: | WITHYMIK01 |
| Career Footnotes: | |
William Michael Withycombe (born November 18, 1964) is an American former professional football offensive lineman who played three seasons in the Canadian Football League (CFL), mainly for the Baltimore Stallions. Previously he played four seasons in the National Football League (NFL) for three different teams after being selected by the New York Jets in the fifth round of the 1988 NFL draft.[2] He played college football at Fresno State University. He was a part of the Stallions' Grey Cup victory in 1995. He won the CFL's Most Outstanding Offensive Lineman Award in 1995.
On April 17, 2017, while in Las Vegas, Withycombe received media attention for stepping in to protect a female neighbor and her daughter from a man who was threatening to kill them.[3] Withycombe, who had been sleeping in his home, was awakened by the sound of shouting. He put on the first garment at hand - a kilt - and headed outside to assess the situation. After Withycombe asked the intruder to leave, the man took a swing at him, so Withycombe tackled him and restrained him until police arrived on the scene. News reports indicate that Withycombe's unusual attire was a source of great amusement for the responding officers.