Bob Duff (rugby union)

Bob Duff is a former Scottish international rugby union player. He played as a centre.

Duff earned four caps for Scotland between 1974 and 1975. He made his debut against Wales in Cardiff on 16 March 1974. His other international appearances were against France in Paris (1974), Ireland in Dublin (1975), and England in Edinburgh (1975).

He played club rugby for Heriot's FP. He was also selected for the British Lions tour to South Africa in 1974, but did not play in any of the test matches.