Ian Duncan is a former freestyle wrestler from Scotland who competed at the Commonwealth Games, winning a bronze medal.
Duncan represented the Scottish team at the 1974 British Commonwealth Games in Christchurch, New Zealand, where he competed in the 100 kg heavyweight category, winning a bronze medal.
Duncan represented the Great Britain team and was a three-times winner of the British Wrestling Championships at heavyweight in 1973, 1979 and 1980.
In 1980 he received a silver award in recognition for his services to Scottish sport.