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William Duncan (born 14 March 1880 in Kilsyth, Scotland) was a Scottish association football goalkeeper who played professionally in Scotland and the United States. Duncan began his career with St Mirren F.C. At some point, he moved to Celtic F.C. where he won the 1909-1910 league championship. He also played for Airdrieonians He then moved to the United States where in 1915, he signed with Bethlehem Steel of the National Association Football League. Duncan and his teammates won the 1915 National Challenge Cup. He would go on to win the Cup another three times with Bethlehem, in 1916, 1918 and 1919. In 1919, Duncan was part of the Bethlehem Steel tour of South America. In 1922, he joined Fall River United in the American Soccer League. He played only three games with the team before retiri