1900 General Election - South County Dublin
| Year | 1900 |
| General election | 1900 General Election |
| Constituency | South County Dublin |
| Turnout | 73.0% |
Results
| Candidate | Party | Votes |
| Mooney, John Joseph | Irish Parliamentary | 3,410 |
| Plunkett, Horace Curzon | Irish Unionist | 2,906 |
| Ball, Francis Elrington | Independent Unionist | 1,539 |