| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Marcus Christopher•O'Sullivan |
| Used name | Marcus•O'Sullivan |
| Born | 22 December 1961 in Cork, Cork (IRL) |
| Measurements | 175 cm / 60 kg |
| Affiliations | Leevale/Ballymore-Cobh/New Balance Track Club, USA |
| NOC | Ireland |
Personal Bests: 800 – 1:45.87 (1985); 1500 – 3:33.61 (1996).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1984 Summer Olympics | Athletics | IRL |
Marcus O'Sullivan | |||
| 800 metres, Men (Olympic) | 6 h4 r2/4 | |||||
| 1,500 metres, Men (Olympic) | 9 h2 r2/3 | |||||
| 1988 Summer Olympics | Athletics | IRL |
Marcus O'Sullivan | |||
| 1,500 metres, Men (Olympic) | 8 | |||||
| 1992 Summer Olympics | Athletics | IRL |
Marcus O'Sullivan | |||
| 1,500 metres, Men (Olympic) | 8 h2 r2/3 | |||||
| 1996 Summer Olympics | Athletics | IRL |
Marcus O'Sullivan | |||
| 1,500 metres, Men (Olympic) | 6 h4 r1/3 |