| Birth Date: | 6 November 1954 |
| Birth Place: | Bedlinog, Wales |
| Height: | 193cm (76inches) |
| Weight: | 98kg (216lb) |
| Position: | No. 8 |
| Amatteam1: | Bridgend RFC |
| Amatteam2: | Barbarian F.C. |
| Amatteam3: | Glamorgan County RFC |
| Repteam1: | Wales |
| Repteam2: | British and Irish Lions |
| Repyears1: | 1980 - 1982 |
| Repyears2: | 1980 |
| Repcaps1: | 5 |
| Repcaps2: | 0 |
| Reppoints1: | 0 |
| Reppoints2: | 0 |
| Occupation: | teacher and later Building Society Manager |
| School: | Bridgend Grammar School |
| University: | Cardiff College of Education |
Gareth Powell Williams (6 November 1954 – 12 May 2018)[1] was a Wales international rugby union player who played club rugby for Bridgend RFC. In 1980, he toured South Africa with the British Lions[2] as a replacement for the injured Stuart Lane.
He had suffered with multiple system atrophy since 2012 and had been bed-bound since 2017. He died in May 2018.[3]
He was the brother of Owain Williams.[4]