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William Mills Millar (20 March 1901 – 19 July 1966) was a Scottish professional footballer who played as an outside forward in Scottish football for Dunipace Juniors, Bo'ness, Hearts and Ayr United, in the Football League for Middlesbrough and York City, in non-League football for Rhyl Athletic and York Wednesday, in Irish football for Glentoran and Drumcondra and was on the books of Crewe Alexandra without making a league appearance.