|Full name||Sydney Arthur Williams|
|Born||17 April 1918
|Died||28 August 1976 (aged 58)
|Position||fullback, wing, centre|
|1940||→ Wigan (guest)||1||0||0||0|
Sydney Arthur "Syd"/"Sid" Williams (17 April 1918 — 28 August 1976 (aged 58)) born in Aberavon, was a Welsh dual-code international rugby union and professional rugby league footballer of the 1930s, '40s and '50s, playing representative level rugby union (RU) for Wales, and at club level for Aberavon RFC, as a Wing, i.e. number 11 or 14, and playing representative level rugby league (RL) for Wales, and at club level for Salford, as fullback, wing, or centre, i.e. number, 1, 2 or 5, or, 3 or 4. He also appeared for Wigan as a wartime guest player, he died in Neath.
- Williams, Graham; Lush, Peter; Farrar, David (2009). The British Rugby League Records Book. London League. pp. 108–114. ISBN 978-1-903659-49-6.
- Latham, Michael; Gate, Robert (1992). They played for Wigan. Adlington: Mike R.L. ISBN 978-0-9516098-2-8.
- "Statistics at scrum.com". scrum.com. 31 December 2011. Retrieved 1 January 2012.