1918 General Election - South Fermanagh
| Year | 1918 |
| General election | 1918 General Election |
| Constituency | South Fermanagh |
| Turnout | 89.6% |
Results
| Candidate | Party | Votes |
| O'Mahony, Seán | Sinn Féin | 6,673 |
| Cooper, James | Irish Unionist | 4,524 |
| Crumley, Patrick | Irish Parliamentary | 1,312 |