John Sydney Ryan (born 23 February 1944) is an Australian sprint freestyle
swimmer of the 1960s, who won a bronze medal in the 4×100-metre freestyle relay at the
1964 Summer Olympics in Tokyo.
The
West Australian combined with
Bob Windle,
David Dickson and
Peter Doak to win Bronze in the 4 × 100 m freestyle relay, behind the United States and German teams, the first time this event had been contested at the Olympics. He also made the semifinals of the 100-metre freestyle. Ryan later took gold in the 4 × 100 m freestyle relayfreestyle relay at the
1966 Commonwealth Games in Kingston, Jamaica, and finished fourth in the 110-yard freestyle event.