Duncairn, a division of the parliamentary borough of Belfast, was a UKparliamentary constituency inIreland. It returned oneMember of Parliament (MP) to theHouse of Commons of the United Kingdom from 1918 to 1922, using thefirst past the post electoral system.

Under theRedistribution of Seats Act 1885, theparliamentary borough ofBelfast had been divided into four divisions:Belfast East,Belfast North,Belfast South andBelfast West. A Report of the Boundary Commission recommended extending the parliamentary borough to include the whole of thecounty borough as had been defined under theLocal Government (Ireland) Act 1898, with an increase to nine divisions.^[1]

For the division of Duncairn, it recommended a definition of:^[2]

the Duncairn ward and the north-eastern part of the then Clifton ward ofBelfast Corporation lying north and east of a line commencing at a point in the western boundary of the ward opposite the middle of Old Park Road proceeding along the middle of Old Park Road to its junction with Mountview Street, then along the middle of Mountview Street to its junction with Manor Street, then northwards along the middle of Manor Street to its junction with Cliftonville Road, then south-eastwards along the middle of Cliftonville Road to the ward boundary in Duncairn Street.

This was adopted under theRedistribution of Seats (Ireland) Act 1918. The area had previously been in theBelfast North constituency. It was in use at the1918 general election only. Under theGovernment of Ireland Act 1920 its area was again part of the Belfast North constituency, with effect at the1922 general election.

The constituency was a strongly unionist area. Carson was the Unionist leader in the House of Commons.^[3] His chief opponent was Major William Hamilton Davey, recently returned from France following the armistice. A barrister in civilian life, Major Davey stood for Home Rule and retained his deposit. During the course of the campaign Carson mistakenly referred to Major Davey as a 'Sinn Féiner' which led to damages being awarded to Major Davey in his subsequent action for slander.^{[citation needed]}

After the 1918 election, Sinn Féin invited all thoseelected for constituencies in Ireland to sit asTDs inDáil Éireann rather than in the House of Commons of the United Kingdom.^[4] All those elected for Irish constituencies were included in the roll of the Dáil but only those elected for Sinn Féin sat in theFirst Dáil.^[5] In May 1921, the Dáil passed a resolution declaring thatelections to the House of Commons of Northern Ireland and the House of Commons of Southern Ireland would be used as the election for theSecond Dáil and that the First Dáil would be dissolved on the assembly of the new body.^[6] The area of Belfast Duncairn would then have been represented in the Dáil by the four-seat constituency ofBelfast North, which also returned no representatives for Sinn Féin.

• Carson appointed aLord of Appeal in Ordinary and created Baron Carson

• List of UK Parliament Constituencies in Ireland and Northern Ireland
• List of MPs elected in the 1918 United Kingdom general election
• Historic Dáil constituencies

• Leigh Rayment's Historical List of MPs – Constituencies beginning with "D" (part 4)
• "Report of the Boundary Commission (Ireland): Representation of the People Bill 1917: Redistribution of Seats". Boundary Commission (Ireland). Retrieved13 June 2023.
• Walker, Brian M., ed. (1978).Parliamentary Election Results in Ireland, 1801–1922. Dublin: Royal Irish Academy. p. 384.ISBN 0901714127.
• Stenton, M.; Lees, S., eds. (1979).'Who's Who of British members of parliament: Volume III 1919–1945. The Harvester Press.
• Information about boundaries of the constituency derived from the map of Northern Ireland Parliament constituencies (in force from 1921) and the wards included in the Belfast UK Parliament seats (in force 1922) for which see respectively
  • Craig, F.W.S., ed. (1972).Boundaries of Parliamentary Constituencies 1885–1972. Political Reference Publications.
  • Elliott, Sydney, ed. (1973).Northern Ireland Parliamentary Election Results 1921–1972. Political Reference Publications.

• Historic Westminster constituencies in Belfast
• Dáil constituencies in Northern Ireland (historic)
• Constituencies of the Parliament of the United Kingdom established in 1918
• Constituencies of the Parliament of the United Kingdom disestablished in 1922

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