William Behan (8 August 1911 – 12 November 1991) was an Irish footballer who played as a goalkeeper for Shelbourne, Shamrock Rovers and Manchester United during the 1930s. He made his Rovers debut on 8 February 1931 in a 5–1 win over Bray Unknowns at Milltown. In his first season, he won the FAI Cup. Behan signed for Manchester United in September 1933, along with fellow Irishman David Byrne - they were the first players from the south of Ireland to play for the club in over a decade. Billy died in November 1991 at the age of 80.