Benjamin Robert Duff (16 October 1867 – 25 June 1943) was a South African rugby union international.

Duff, born in Swellendam, had a brother Colin who represented Rhodesia at cricket and rugby.

Although he batted with the tail, at number 10 in both innings, Duff wasn't called on to bowl once in the match.

[3] In 1891, Duff played three rugby union Test matches in a home series against the British Isles.

These were the first ever official Tests that South Africa played and due to the order in which players' names were listed on team sheets for a match at the time, Duff has the distinction of being the first Springbok.