In Northern Ireland:
- 2 MPs voted Yes (11.1%)
- 9 MPs voted No (50%)
- 6 MPs didn't vote (33.3%)
- One seat (Mid Ulster) is currently vacant pending a by-election.
The following list is how Northern Irish MPs voted in that division.
|Gregory Campbell||DUP||East Londonderry||No|
|Nigel Dodds||DUP||Belfast North||No|
|Pat Doherty||Sinn Féin||West Tyrone||Didn't Vote*|
|Jeffrey Donaldson||DUP||Lagan Valley||No|
|Michelle Gildernew||Sinn Féin||Fermanagh and South Tyrone||Didn't Vote*|
|Sylvia Hermon||Independent||North Down||No|
|Naomi Long||Alliance||Belfast East||Yes|
|Paul Maskey||Sinn Féin||Belfast West||Didn't Vote*|
|William McCrea||DUP||South Antrim||No|
|Conor Murphy||Sinn Féin||Newry and Armagh||Didn't Vote*|
|Alasdair McDonnell||SDLP||Belfast South||Didn't Vote|
|Ian Paisley Jr||DUP||North Antrim||No|
|Margaret Ritchie||SDLP||South Down||Didn't Vote|
|David Simpson||DUP||Upper Bann||No|
|Sammy Wilson||DUP||East Antrim||No|
*Sinn Féin MPs don't attend the House of Commons.