| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | John Birnie•Marshall | |
| Used name | John•Marshall | |
| Born | 1 February 1930 in Bondi, New South Wales |  AUS |
| Died | 30 January 1957 (aged 26 years 11 months 29 days) in Melbourne, Victoria | AUS |
| Affiliations | Yale University — New Haven, Connecticut |  USA |
| NOC | Australia | AUS |
| Medals | OG |
| Gold | 0 |
| Silver | 1 |
| Bronze | 1 |
| Total | 2 |
Killed in a car accident.
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1948 Summer Olympics | Swimming (Aquatics) | AUS |
John Marshall | |||
| 400 metres Freestyle, Men (Olympic) | 3 | Bronze | ||||
| 1,500 metres Freestyle, Men (Olympic) | 2 | Silver | ||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Australia | |||||
| 1952 Summer Olympics | Swimming (Aquatics) | AUS |
John Marshall | |||
| 400 metres Freestyle, Men (Olympic) | 15 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 8 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Australia | 9 | ||||
| 1956 Summer Olympics | Swimming (Aquatics) | AUS |
John Marshall | |||
| 200 metres Butterfly, Men (Olympic) | 5 |
