| 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 in Melbourne, Victoria (AUS) |
| Affiliations | Yale Bulldogs, New Haven (USA) |
| NOC | Australia |
| 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 |