Joseph Henry "Jake" Blackmore (unknown - 26 March 1964) was an international rugby forward who played rugby union for Abertillery and rugby league with Hull Kingston Rovers. He won a single cap for Wales under the rugby union code and then represented his country at rugby league in two matches between 1910 and 1911. Despite winning only one cap, he became a Triple Crown winning player when he played in the opening game of the 1909 Home Nations Championship.