Iain Campbell (born 21 April 1965) is a British swimmer. He competed in two events at the 1984 Summer Olympics. Representing Scotland, he won a bronze medal in the 4x100 medley relay at the 1982 Commonwealth Games and also competed at the 1986 Commonwealth Games.
His elder brother Doug Campbell was also an Olympic swimmer (as was Doug's wife Nikki Fibbens, and her brother Mike Fibbens).