1918 South Armagh by-election
The 1918 South Armagh by-election was held on 2 February 1918. The by-election was held due to the death of the incumbent Irish Parliamentary Party MP, Charles O'Neill. It was won by the Irish Parliamentary candidate Patrick Donnelly. Security for the election was provided by members of the Irish Volunteers who arrived in Armagh by train and were greeted by the Tyrone Irish Republican Eamon Donnelly.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Irish Nationalist | Patrick Donnelly | 2,324 | 63.34 | −10.90 | |
| Sinn Féin | Patrick McCartan | 1,305 | 35.57 | New | |
| Ind. Unionist | Thomas Wakefield Richardson | 40 | 1.09 | New | |
| Majority | 1,019 | 27.77 | −20.71 | ||
| Turnout | 6,345 | 57.83 | +0.66 | ||
| Irish Nationalist hold | Swing | ||||