| Belfast Duncairn | |
|---|---|
| Former borough constituency for the House of Commons | |
| Borough | Belfast |
| 1918–1922 | |
| Seats | 1 |
| Created from | Belfast North |
| Replaced by | Belfast North |
Duncairn, a division of the parliamentary borough of Belfast, was a UK parliamentary constituency in Ireland. It returned one Member of Parliament (MP) to the House of Commons of the United Kingdom from 1918 to 1922, using the first past the post electoral system.