1918 General Election - South Londonderry
| Year | 1918 |
| General election | 1918 General Election |
| Constituency | South Londonderry |
| Turnout | 77.1% |
Results
| Candidate | Party | Votes |
| Henry, Denis Stanislaus | Irish Unionist | 8,942 |
| Conway, Arthur William | Irish Parliamentary | 3,981 |
| Walsh, Louis Joseph | Sinn Féin | 3,425 |