| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Denis James•O'Neil |
| Used name | Denis•O'Neil |
| Born | 11 February 1936 |
| Measurements | 178 cm / 81 kg |
| NOC |  Australia |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1972 Summer Olympics | Sailing | AUS |
Denis O'Neil | |||
| Three-Person Keelboat, Open (Olympic) | Australia | 16 | ||||
| 1976 Summer Olympics | Sailing | AUS |
Denis O'Neil | |||
| Three-Person Keelboat, Open (Olympic) | Australia | 11 |
