Sven Olof Erik "Olle" Ferm (born 8 March 1947) is a retired Swedish swimmer who won a bronze medal in the 4 × 200 m freestyle relay at the 1966 European Aquatics Championships. He competed at the 1964 and 1968 Summer Olympics in the 4 × 200 m relay and three individual medley events with the best achievement of eighth place in the relay in 1968.