| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Peter John•Duncan |
| Used name | Peter•Duncan |
| Born | 15 April 1935 in Pretoria, Gauteng (RSA) |
| NOC | South Africa |
Peter Duncan had the following podium finishes at major championships: 2nd in the 1954 British Empire and Commonwealth Games 1650 yards Freestyle, 3rd in the 1954 British Empire and Commonwealth Games 4×220 yards Freestyle Relay (with Dennis Ford, Graham Johnston, and Billy Steuart). In the 1954 British Empire and Commonwealth Games 440 yards freestyle Duncan finished fourth.
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1952 Summer Olympics | Swimming (Aquatics) | RSA |
Peter Duncan | |||
| 400 metres Freestyle, Men (Olympic) | 4 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 7 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | South Africa | 7 | ||||
| 1956 Summer Olympics | Swimming (Aquatics) | RSA |
Peter Duncan | |||
| 100 metres Freestyle, Men (Olympic) | 31 | |||||
| 400 metres Freestyle, Men (Olympic) | 21 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 19 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | South Africa | 8 |