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.

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.

He was educated at Wesley College in South Perth.

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