1918 East Tyrone by-election

The East Tyrone by-election of 1918 was held on 3 April 1918. The by-election was held due to the resignation of the incumbent Irish Parliamentary Party MP, William Redmond. It was won by the Irish Parliamentary candidate Thomas Harbison.

Redmond had resigned in order to contest the Waterford City by-election which had become vacant when his father, John Redmond, had died. The Sinn Féin candidate was Seán Milroy. The by-election was the last in a short string of by-elections where it seemed that the more moderate nationalists were regaining ground from Sinn Féin before being virtually wiped out in the 1918 Irish general election.

By-election 3 April 1918: Tyrone East

Party		Candidate	Votes	%	±%
	Irish Nationalist	Thomas Harbison	1,802	59.6
	Sinn Féin	Seán Milroy	1222	40.4	New
Majority			580	19.2
Turnout			3024	43.9
	Irish Nationalist hold		Swing