Milngavie, Dunbartonshire born full back Jack Bethune began his football career with Milngavie Allander in 1908 and played for Vale of Clyde in 1909 and Glasgow Ashfield in 1910 before joining Heart of Midlothian in 1911, making his Scottish League debut at Hamilton Academical in March 1912 and making 3 appearances for The Jambos. He also played for Hamilton Academical and Bonnyrigg Rose Athletic before coming south of the border to join North Eastern League club Darlington in 1912.
That September he signed for Second Division Barnsley, making his Football League debut in November against Burnley. He was an ever present in 1913-14 missing only one game in 1914-15, the final season before peacetime football was suspended due to the onset of the First World War. He resumed playing League football for Barnsley after the resumption of peacetime football in 1919 but only stayed one season, moving to Bristol Rovers in May 1920 after 107 matches and a solitary goal for Barnsley, scored while deputising at inside forward in a 4-2 win at Wolverhampton Wanderers in November 1919.
He stayed just over a year at Eastville playing 32 matches for Bristol Rovers before a move to Brentford in November 1921. However he only played 10 games for The Bees before retiring from professional football, joining non league Sittingbourne in 1922 and later playing for Sittingbourne Paper Mills from 1927 before his retirement.