Andrew "Andy" Frank Millen (born 10 June 1965, in Glasgow) is a Scottish retired professional footballer who played in defence. He is the assistant manager of St. Mirren. During his career, Millen played for St Johnstone, Alloa Athletic, Hamilton Academical, Kilmarnock, Hibernian, Raith Rovers, Ayr United, Greenock Morton, Clyde and finished his career with St. Mirren in the Scottish Premier League.