William Winstanley (c. 1886 – death unknown) was an English professional rugby league footballer who played in the 1900s and 1910s. He played at representative level for Great Britain, England and Lancashire, and at club level for (in Platt Bridge, Wigan), Leigh (Heritage № 151), and Wigan (Heritage №), as a forward (prior to the specialist positions of; prop, hooker, second-row, loose forward), during the era of contested scrums.