Sid Williams (disambiguation)
Sid Williams is a former American football linebacker and diplomat.
Sid, Syd, Sidney or Sydney Williams may also refer to:
- Sidney Williams , American author
- Sidney Williams , American baseball pitcher
- Sid E. Williams, American chiropractor and founder of Life University
- Sid Williams , English association footballer for Bristol City from 1937 to 1952
- Sid Williams, Australian rugby footballer who played in the 1960s and 1979s
- Syd Williams, Welsh rugby union and rugby league footballer
- Sid Williams Theatre is the major performance theatre in the Comox Valley, Courtenay, British Columbia, Canada