Irish elections, 1921

Southern Ireland general election, 1921

← 1918 24 May 1921 1922 →
← outgoing members Members elected →
128 seats in the House of Commons of Southern Ireland
First party Second party   Leader Éamon de Valera None Party Sinn Féin Independent Unionist Leader since 1917 N/A Leader's seat Clare East N/A Seats won 124 4 Popular vote Unopposed Unopposed
Percentage of seats gained by each of the party. Sinn Féin candidates in Southern Ireland were returned unopposed (dark green). The Nationalist Party and Ulster Unionist Party ran only in Ulster, along with Sinn Féin.

Northern Ireland general election, 1921

← 1918 24 May 1921 1925 →
MPs elected →
All 52 seats to the Northern Ireland House of Commons 27 seats were needed for a majority
First party Second party Third party   Leader James Craig Éamon de Valera Joe Devlin Party UUP Sinn Féin Nationalist Leader since 1921 1917 1918 Leader's seat Down Down Belfast West Seats won 40 6 6 Popular vote 343,347 104,917 60,577 Percentage 66.9% 20.5% 11.8%
Percentage of seats gained by each of the party.
Prime Minister before election N/A Elected Prime Minister James Craig UUP

N/A

James Craig
UUP

Two elections in Ireland took place in 1921, as a result of the Government of Ireland Act 1920 to establish the House of Commons of Northern Ireland and the House of Commons of Southern Ireland. The election was used by Irish Republicans as the basis of membership of the Second Dáil. Where contested, the elections used single transferable vote.

No actual polling took place in Southern Ireland as all 128 candidates were returned unopposed. Of these, 124 were won by Sinn Féin and four by independent Unionists representing the University of Dublin (Trinity College). When the date of the elections was announced in the House of Commons, the Conservative MP Sir William Davison, who had been born in Broughshane, County Antrim, had asked "What is the object of holding elections in Southern Ireland when any candidates who do not support Sinn Fein would be shot?" Other members had replied "How do you know?"

Only Sinn Féin candidates recognised the Dáil and five of these had been elected in two constituencies (Michael Collins, Éamon de Valera, Arthur Griffith, Seán Milroy and Eoin MacNeill) one in each part of Ireland. The total number of members who assembled in the Second Dáil was 125: 119 elected solely in Southern Ireland, 1 solely in Northern Ireland (Seán O'Mahony), and 5 in both.