| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Nathaniel•O'Brien | |
| Used name | Nathaniel•O'Brien | |
| Born | 3 March 1983 in Bellevue, Washington |  USA |
| Measurements | 183 cm / 86 kg | |
| Affiliations | Pacific Coast Swimming — Victoria, British Columbia |  CAN |
| NOC | Canada | CAN |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2004 Summer Olympics | Swimming (Aquatics) | CAN |
Nathaniel O'Brien | |||
| 200 metres Backstroke, Men (Olympic) | 14 | |||||
| 200 metres Butterfly, Men (Olympic) | 23 |
