Colin Eric Duff (28 February 1876 – 17 May 1941) was a Rhodesian sportsman who represented his country in cricket and rugby union. Duff, who grew up in the Cape Colony, played his early rugby with Western Province, before transferring to Rhodesia, with the help of former England international and Rhodesian administrator William Henry Milton. He competed for the Rhodesian rugby team in the Currie Cup and set a competition record four drop goals in a fixture against Border. The record wasn't beaten until 1992, when Naas Botha booted five drop goals for Northern Transvaal.