| Roles | Non-starter |
|---|---|
| Sex | Male |
| Full name | James W.•O'Mara |
| Used name | James•O'Mara |
| Born | 20 October 1881 in Tallow, Waterford (IRL) |
| Affiliations | Cambridgeport Gymnasium, Cambridgeport, Cambridge (USA) |
| NOC |  United States |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1908 Summer Olympics | Athletics | USA |
James O'Mara | |||
| Marathon, Men (Olympic) |
