| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Geoffrey Charles•Marks | |
| Used name | Geoffrey•Marks | |
| Born | 2 January 1932 in Colombo, Basnahira |  SRI |
| Died | 30 August 1990 (aged 58 years 7 months 28 days) in Melbourne, Victoria |  AUS |
| NOC | Sri Lanka | SRI |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1952 Summer Olympics | Swimming (Aquatics) | SRI |
Geoffrey Marks | |||
| 100 metres Freestyle, Men (Olympic) | =54 | |||||
| 400 metres Freestyle, Men (Olympic) | 43 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 30 |
