| Birth Date: | 6 November 1954 |
| Birth Place: | Bedlinog, Wales |
| Height: | 193cm (76inches) |
| Weight: | 98kg (216lb) |
| Ru Position: | No. 8 |
| Ru Amateurclubs: | Bridgend RFC Barbarian F.C. Glamorgan County RFC |
| Ru Nationalteam: | Wales British and Irish Lions |
| Ru Nationalyears: | 1980 - 1982 1980 |
| Ru Nationalcaps: | 5 0 |
| Ru Nationalpoints: | (0) (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]