Lagan Valley (UK Parliament constituency)

For the history of the equivalent constituencies prior to 1950, see Antrim (UK Parliament constituency) and Down (UK Parliament constituency) and from 1950 until 1983, please see South Antrim (UK Parliament constituency) and North Down.

{{maplink|raw={{Wikipedia:Map data/Lagan Valley (UK Parliament constituency) 2010}}|frame=yes|frame-width=260|text=Map of boundaries 2010–2024}}

1983–1997: The District of Lisburn, and the Borough of Castlereagh ward of Carryduff.

1997–2010: The District of Lisburn wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Derryaghy, Dromara, Drumbo, Dunmurry, Glenavy, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Seymour Hill, Tonagh, and Wallace Park, and the District of Banbridge wards of Dromore North, Dromore South, Gransha, and Quilly.

2010–2024: The City of Lisburn wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Dromara, Drumbo, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Seymour Hill, Tonagh, Wallace Park, and part of Derryaghy; the District of Banbridge wards of Dromore North, Dromore South, Gransha, and Quilly and the Ballynahatty and Edenderry parts of the Belvoir ward of the City of Belfast.

2024–present: The District of Armagh, Banbridge and Craigavon wards of Aghagallon, Donaghcloney, Dromore, Gransha, Magheralin, and Quilly; and the District of Lisburn and Castlereagh wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Dromara, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Ravernet, Wallace Park, and White Mountain.

The seat was created in 1983, as part of an expansion of Northern Ireland's constituencies from 12 to 17, and was predominantly made up from parts of South Antrim and North Down. In their original proposals, in January 1980, the boundary commission proposed calling it 'Lagan'. In further revisions in 1995 it lost some areas to both Belfast West and Strangford.

Following their review of all parliamentary seats in Northern Ireland prior to the 2010 United Kingdom general election the Boundary Commission for Northern Ireland made alterations to Lagan Valley. In an unprecedented decision, passed by Parliament through the Northern Ireland Parliamentary Constituencies Order,{{Cite web|url=http://www.legislation.gov.uk/ukdsi/2008/9780110813172/contents/data.htm|archive-url=https://web.archive.org/web/20081205075225/http://www.opsi.gov.uk/si/si2008/draft/ukdsi_9780110813172_en_1|url-status=dead|title=The Parliamentary Constituencies (Northern Ireland) Order 2008|archive-date=5 December 2008|publisher=legislation.gov.uk}} one electoral ward was split between two constituencies. This followed concerns in Derriaghy about being moved into the neighbouring but republican West Belfast seat.

The Member of Parliament since 1997 was Sir Jeffrey Donaldson who was elected as a member of the Ulster Unionist Party but switched to the Democratic Unionist Party in 2004. He succeeded James Molyneaux who had represented the seat for the UUP since the 1983 general election and previously sat for the old South Antrim constituency which covered much of the same area. Donaldson was elected Leader of the DUP in June 2021, but resigned the leadership in March 2024.

thumb

{{Election box begin|title=General election 2024: Lagan Valley{{Cite web |date=2024-06-07 |title=Statement of Persons Nominated and Notice of Poll |url=https://www.eoni.org.uk/getmedia/320a604a-e3ab-4c4c-a010-9586aec24353/Statement-of-Persons-Nominated-combined-with-Notice-of-Poll |access-date=2024-06-07 |website=Electoral Office for Northern Ireland |language=en-GB}}{{cite news |title=Lagan Valley - General election results 2024 |url=https://www.bbc.co.uk/news/election/2024/uk/constituencies/N05000009 |access-date=15 December 2024 |work=BBC News}}}}

{{Election box winning candidate with party link|party=Alliance Party of Northern Ireland|candidate=Sorcha Eastwood|votes=18,618|percentage=37.9|change=+10.8}}

{{Election box candidate with party link|party=Democratic Unionist Party|candidate=Jonathan Buckley|votes=15,659|percentage=31.9|change=−11.5}}

{{Election box candidate with party link|party=Ulster Unionist Party|candidate=Robbie Butler|votes=11,157|percentage=22.7|change=+4.2|}}

{{Election box candidate with party link|party=Traditional Unionist Voice|candidate=Lorna Smyth|votes=2,186|percentage=4.5|change=New}}

{{Election box candidate with party link|party=Social Democratic and Labour Party|candidate=Simon Lee|votes=1,028|percentage=2.1|change=−2.0}}

{{Election box candidate with party link|party=Green Party of Northern Ireland|candidate=Patricia Denvir|votes=433|percentage=0.9|change=New}}

{{Election box majority|votes=2,959|percentage=6.0|change=N/A}}

{{Election box turnout|votes=49,081|percentage=60.0|change=−0.2}}

{{Election box registered electors|reg. electors=82,201}}

{{Election box gain with party link|winner=Alliance Party of Northern Ireland|loser=Democratic Unionist Party|swing =+11.15}}

{{Election box end}}

{{Election box begin | title = General election 2019: Lagan Valley{{cite news |title=Lagan Valley Parliamentary constituency |url=https://www.bbc.co.uk/news/politics/constituencies/N06000009 |publisher=BBC News |access-date=18 November 2019 |archive-date=9 January 2020 |archive-url=https://web.archive.org/web/20200109234903/http://www.bbc.co.uk/news/politics/constituencies/N06000009 |url-status=live }}{{cite web |url=https://researchbriefings.files.parliament.uk/documents/CBP-8749/CBP-8749.pdf |date=28 January 2020 |title=Commons Briefing Paper 8749. General Election 2019: results and analysis |publisher=House of Commons Library |location=London |access-date=19 January 2022 |url-status=live |archive-url=https://web.archive.org/web/20211118043715/https://researchbriefings.files.parliament.uk/documents/CBP-8749/CBP-8749.pdf |archive-date=18 November 2021}}

}}

{{Election box winning candidate with party link|party=Democratic Unionist Party|candidate=Jeffrey Donaldson|votes=19,586|percentage=43.1|change=−16.5}}

{{Election box candidate with party link|party=Alliance Party of Northern Ireland|candidate=Sorcha Eastwood|votes=13,087|percentage=28.8|change=+17.7}}

{{Election box candidate with party link|party=Ulster Unionist Party|candidate=Robbie Butler|votes=8,606|percentage=19.0|change=+2.2}}

{{Election box candidate with party link|party=Social Democratic and Labour Party|candidate=Ally Haydock|votes=1,758|percentage=3.9|change=−3.6}}

{{Election box candidate with party link|party=Sinn Féin|candidate=Gary McCleave|votes=1,098|percentage=2.4|change=−1.1}}

{{Election box candidate with party link|party=Northern Ireland Conservatives|candidate=Gary Hynds|votes=955|percentage=2.1|change=+1.1}}

{{Election box candidate with party link|party=UK Independence Party|candidate=Alan Love|votes=315|percentage=0.7|change=New}}

{{Election box majority|votes=6,499|percentage=14.3|change=−28.5}}

{{Election box turnout|votes=45,405|percentage=60.0|change=−2.2}}

{{Election box registered electors|reg. electors=75,675}}

{{Election box hold with party link|winner=Democratic Unionist Party|swing=−17.1}}

{{Election box end}}

This seat saw a swing towards the Alliance Party of over 17%, and the largest decrease in vote share for the DUP at the 2019 general election.

{{Election box begin|title=General election 2017: Lagan Valley{{cite web|url=http://www.eoni.org.uk/getmedia/b3ede8e0-63b4-4442-b4fe-2d4f486b146a/STATEMENT-OF-PERSONS-NOMINATED-AND-NOTICE-OF-POLL-LV_1|title=Election of a Member of Parliament for the LAGAN VALLEY Constituency – Statement of Persons Nominated and Notice of Poll|publisher=Electoral Office of Northern Ireland|date=11 May 2017|access-date=16 May 2017|archive-date=21 April 2018|archive-url=https://web.archive.org/web/20180421163003/http://www.eoni.org.uk/getmedia/b3ede8e0-63b4-4442-b4fe-2d4f486b146a/STATEMENT-OF-PERSONS-NOMINATED-AND-NOTICE-OF-POLL-LV_1|url-status=live}}{{Cite news|url=https://www.bbc.com/news/politics/constituencies/N06000009|title=Lagan Valley parliamentary constituency – Election 2017|publisher=BBC|access-date=18 July 2019|archive-date=18 July 2019|archive-url=https://web.archive.org/web/20190718221526/https://www.bbc.com/news/politics/constituencies/N06000009|url-status=live}}{{cite web |url=https://researchbriefings.files.parliament.uk/documents/CBP-7979/CBP-7979.pdf |title=Commons Briefing Paper 7979. General Election 2017: results and analysis |edition=Second |date=29 January 2019 |orig-date=7 April 2018 |publisher=House of Commons Library |url-status=live |archive-url=https://web.archive.org/web/20191112183438/https://researchbriefings.files.parliament.uk/documents/CBP-7979/CBP-7979.pdf |archive-date=12 November 2019}}

}}

{{Election box winning candidate with party link|

|party = Democratic Unionist Party

|candidate = Jeffrey Donaldson

|votes = 26,762

|percentage = 59.6

|change = +11.7

}}

{{Election box candidate with party link|

|party = Ulster Unionist Party

|candidate = Robbie Butler

|votes = 7,533

|percentage = 16.8

|change = +1.6

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Aaron McIntyre

|votes = 4,996

|percentage = 11.1

|change = −2.8

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Pat Catney

|votes = 3,384

|percentage = 7.5

|change = +1.2

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Jacqui Russell

|votes = 1,567

|percentage = 3.5

|change = +0.6

}}

{{Election box candidate with party link|

|party = Northern Ireland Conservatives

|candidate = Ian Nickels

|votes = 462

|percentage = 1.0

|change = −0.6

}}

{{Election box candidate with party link|

|party = Independent (politician)

|candidate = Jonny Orr

|votes = 222

|percentage = 0.5

|change = −1.4

}}

{{Election box majority

|votes = 19,229

|percentage = 42.8

|change = +10.1

}}

{{Election box turnout

|votes = 45,044

|percentage = 62.2

|change = +6.3

}}

{{Election box registered electors|

|reg. electors = 72,380

}}

{{Election box hold with party link

|winner = Democratic Unionist Party

|swing = +5.1

}}

{{Election box end}}

{{Election box begin | title=General election 2015: Lagan Valley{{Cite web|url=http://www.eoni.org.uk/Elections/Election-results-and-statistics/Election-results-and-statistics-2003-onwards/Elections-2015/UK-Parliamentary-Election-Results/UK-Parliamentary-Election-Result-Belfast-East-(8)|title=The Electoral Office of Northern Ireland – EONI|website=eoni.org.uk|access-date=23 August 2015|archive-date=24 September 2015|archive-url=https://web.archive.org/web/20150924001351/http://www.eoni.org.uk/Elections/Election-results-and-statistics/Election-results-and-statistics-2003-onwards/Elections-2015/UK-Parliamentary-Election-Results/UK-Parliamentary-Election-Result-Belfast-East-(8)|url-status=live}}{{cite web|title=Election Data 2015|url=http://www.electoralcalculus.co.uk/electdata_2015.txt|publisher=Electoral Calculus|access-date=17 October 2015|archive-url=https://web.archive.org/web/20151017112223/http://www.electoralcalculus.co.uk/electdata_2015.txt|archive-date=17 October 2015}}}}

{{Election box winning candidate with party link|

|party = Democratic Unionist Party

|candidate = Jeffrey Donaldson

|votes = 19,055

|percentage = 47.9

|change = −1.9

}}

{{Election box candidate with party link|

|party = Ulster Unionist Party

|candidate = Alexander Redpath

|votes = 6,055

|percentage = 15.2

|change = −5.9

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Trevor Lunn

|votes = 5,544

|percentage = 13.9

|change = +2.5

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Pat Catney

|votes = 2,500

|percentage = 6.3

|change = +1.3

}}

{{Election box candidate with party link|

|party = UK Independence Party

|candidate = Alan Love

|votes = 2,200

|percentage = 5.5

|change = New

}}

{{Election box candidate with party link|

|party = Traditional Unionist Voice

|candidate = Samuel Morrison

|votes = 1,887

|percentage = 4.7

|change = −3.9

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Jacqui McGeough

|votes = 1,144

|percentage = 2.9

|change = −1.1

}}

{{Election box candidate with party link|

|party = Independent (politician)

|candidate = Jonny Orr

|votes = 756

|percentage = 1.9

|change = New

}}

{{Election box candidate with party link|

|party = Northern Ireland Conservatives

|candidate = Helen Osborne

|votes = 654

|percentage = 1.6

|change = New

}}

{{Election box majority|

|votes = 13,000

|percentage = 32.7

|change = +4.0

}}

{{Election box turnout|

|votes = 39,795

|percentage = 55.9

|change = −0.1

}}

{{Election box registered electors|

|reg. electors = 71,152

}}

{{Election box hold with party link|

|winner = Democratic Unionist Party

|swing = +2.0

}}

{{Election box end}}

{{Election box begin | title=General election 2010: Lagan Valley{{cite web|title=Election Data 2010|url=http://www.electoralcalculus.co.uk/electdata_2010.txt|publisher=Electoral Calculus|access-date=17 October 2015|archive-url=https://web.archive.org/web/20130726162034/http://www.electoralcalculus.co.uk/electdata_2010.txt|archive-date=26 July 2013 }}}}

{{Election box winning candidate with party link|

|party = Democratic Unionist Party

|candidate = Jeffrey Donaldson

|votes = 18,199

|percentage = 49.8

|change = −8.5

}}

{{Election box candidate with party link|

|party = Ulster Conservatives and Unionists

|candidate = Daphne Trimble

|votes = 7,713

|percentage = 21.1

|change = −1.8

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Trevor Lunn

|votes = 4,174

|percentage = 11.4

|change = +0.5

}}

{{Election box candidate with party link|

|party = Traditional Unionist Voice

|candidate = Keith Harbinson

|votes = 3,154

|percentage = 8.6

|change = +8.6

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Brian Heading

|votes = 1,835

|percentage = 5.0

|change = −1.1

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Paul Butler

|votes = 1,465

|percentage = 4.0

|change = −3.5

}}

{{Election box majority|

|votes = 10,486

|percentage = 28.7

|change = −4.5

}}

{{Election box turnout|

|votes = 36,540

|percentage = 56.0

|change = −4.2

}}

{{Election box registered electors|

|reg. electors = 65,257

}}

{{Election box hold with party link|

|winner = Democratic Unionist Party

|swing = −3.4

}}

{{Election box end}}

{{Election box begin |

|title=General election 2005: Lagan Valley{{cite web|title=Election Data 2005|url=http://www.electoralcalculus.co.uk/electdata_2005ob.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054249/http://www.electoralcalculus.co.uk/electdata_2005ob.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Democratic Unionist Party

|candidate = Jeffrey Donaldson

|votes = 23,289

|percentage = 54.7

|change = +41.3

}}

{{Election box candidate with party link|

|party = Ulster Unionist Party

|candidate = Basil McCrea

|votes = 9,172

|percentage = 21.5

|change = −35.0

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 4,316

|percentage = 10.1

|change = −6.5

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Paul Butler

|votes = 3,197

|percentage = 7.5

|change = +1.6

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Patricia Lewsley

|votes = 2,598

|percentage = 6.1

|change = −1.4

}}

{{Election box majority|

|votes = 14,117

|percentage = 33.2

|change = N/A

}}

{{Election box turnout|

|votes = 42,572

|percentage = 60.2

|change = −3.0

}}

{{Election box registered electors|

|reg. electors = 70,238

}}

{{Election box gain with party link|

|winner = Democratic Unionist Party

|loser = Ulster Unionist Party

|swing = +38.1

}}

{{Election box end}}

{{Election box begin |

|title=General election 2001: Lagan Valley{{cite web|title=Election Data 2001|url=http://www.electoralcalculus.co.uk/electdata_2001ob.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054450/http://www.electoralcalculus.co.uk/electdata_2001ob.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = Jeffrey Donaldson

|votes = 25,966

|percentage = 56.5

|change = +1.1

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 7,624

|percentage = 16.6

|change = −0.6

}}

{{Election box candidate with party link|

|party = Democratic Unionist Party

|candidate = Edwin Poots

|votes = 6,164

|percentage = 13.4

|change = −0.2

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Patricia Lewsley

|votes = 3,462

|percentage = 7.5

|change = −0.3

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Paul Butler

|votes = 2,725

|percentage = 5.9

|change = +3.4

}}

{{Election box majority|

|votes = 18,342

|percentage = 39.9

|change = −1.7

}}

{{Election box turnout|

|votes = 45,941

|percentage = 63.2

|change = +1.1

}}

{{Election box registered electors|

|reg. electors = 72,671

}}

{{Election box hold with party link|

|winner = Ulster Unionist Party

|swing = +0.9

}}

{{Election box end}}

{{Election box begin |

|title=General election 1997: Lagan Valley{{cite web|title=Election Data 1997|url=http://www.electoralcalculus.co.uk/electdata_1997.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054424/http://www.electoralcalculus.co.uk/electdata_1997.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = Jeffrey Donaldson

|votes = 24,560

|percentage = 55.4

|change = −5.4

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 7,635

|percentage = 17.2

|change = +4.5

}}

{{Election box candidate with party link|

|party = Democratic Unionist Party

|candidate = Edwin Poots

|votes = 6,005

|percentage = 13.6

|change = New

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Dolores Kelly

|votes = 3,436

|percentage = 7.8

|change = −1.7

}}

{{Election box candidate with party link|

|party = Northern Ireland Conservatives

|candidate = Stuart E. Sexton

|votes = 1,212

|percentage = 2.7

|change = −6.3

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Sue Ramsey

|votes = 1,110

|percentage = 2.5

|change = +0.4

}}

{{Election box candidate with party link|

|party = Workers' Party (Ireland)

|candidate = Frances McCarthy

|votes = 203

|percentage = 0.5

|change = −0.7

}}

{{Election box candidate with party link|

|party = Natural Law Party

|candidate = Hugh Finlay

|votes = 149

|percentage = 0.3

|change = New

}}

{{Election box majority|

|votes = 16,925

|percentage = 38.2

|change = −9.9

}}

{{Election box turnout|

|votes = 44,310

|percentage = 62.1

|change = −5.2

}}

{{Election box registered electors|

|reg. electors = 71,341

}}

{{Election box hold with party link|

|winner = Ulster Unionist Party

|swing = −8.5

}}

{{Election box end}}

{{Election box begin |

|title=General election 1992: Lagan Valley{{cite web|title=Election Data 1992|url=http://www.electoralcalculus.co.uk/electdata_1992ob.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054418/http://www.electoralcalculus.co.uk/electdata_1992ob.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = James Molyneaux

|votes = 29,772

|percentage = 60.8

|change = −9.2

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 6,207

|percentage = 12.7

|change = −1.1

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Hugh Lewsley

|votes = 4,626

|percentage = 9.5

|change = +2.6

}}

{{Election box candidate with party link|

|party = Northern Ireland Conservatives

|candidate = Timothy R. Coleridge

|votes = 4,423

|percentage = 9.0

|change = New

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Patrick Joseph Rice

|votes = 3,346

|percentage = 6.8

|change = +0.4

}}

{{Election box candidate with party link|

|party = Workers' Party (Ireland)

|candidate = Ann Marie Lowry

|votes = 582

|percentage = 1.2

|change = −1.7

}}

{{Election box majority|

|votes = 23,565

|percentage = 48.1

|change = −8.1

}}

{{Election box turnout|

|votes = 48,956

|percentage = 67.3

|change = +2.9

}}

{{Election box registered electors|

|reg. electors = 72,645

}}

{{Election box hold with party link|

|winner = Ulster Unionist Party

|swing =

}}

{{Election box end}}

{{Election box begin |

|title=General election 1987: Lagan Valley{{cite web|title=Election Data 1987|url=http://www.electoralcalculus.co.uk/electdata_1987.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054243/http://www.electoralcalculus.co.uk/electdata_1987.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = James Molyneaux

|votes = 29,101

|percentage = 70.0

|change = +10.8

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 5,728

|percentage = 13.8

|change = +2.5

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Billy McDonnell

|votes = 2,888

|percentage = 6.9

|change = +0.5

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Patrick Joseph Rice

|votes = 2,656

|percentage = 6.4

|change = +2.1

}}

{{Election box candidate with party link|

|party = Workers' Party (Ireland)

|candidate = John Lowry

|votes = 1,215

|percentage = 2.9

|change = +0.9

}}

{{Election box majority|

|votes = 23,373

|percentage = 56.2

|change = +13.8

}}

{{Election box turnout|

|votes = 41,588

|percentage = 64.4

|change = −3.2

}}

{{Election box registered electors|

|reg. electors = 64,873

}}

{{Election box hold with party link|

|winner = Ulster Unionist Party

|swing =

}}

{{Election box end}}

{{Election box begin|title=1986 Lagan Valley by-election{{cite web|url=http://www.election.demon.co.uk/by1983.html|title=By-election Result|website=United Kingdom Election Results|access-date=21 April 2018|archive-date=5 April 2018|archive-url=https://web.archive.org/web/20180405203844/http://www.election.demon.co.uk/by1983.html|url-status=dead}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = James Molyneaux

|votes = 32,514

|percentage = 90.7

|change = +31.5

}}

{{Election box candidate with party link|

|party = Workers' Party (Ireland)

|candidate = John Lowry

|votes = 3,328

|percentage = 9.3

|change = +7.3

}}

{{Election box majority|

|votes = 29,186

|percentage = 81.4

|change = +39.0

}}

{{Election box turnout|

|votes = 35,842

|percentage = 57.8

|change = −9.8

}}

{{Election box registered electors|

|reg. electors = 63,244

}}

{{Election box hold with party link|

|winner = Ulster Unionist Party

|swing =

}}

{{Election box end}}

{{Election box begin |

|title=General election 1983: Lagan Valley{{cite web|title=Election Data 1983|url=http://www.electoralcalculus.co.uk/electdata_1983.txt|publisher=Electoral Calculus|access-date=18 October 2015|archive-url=https://web.archive.org/web/20111015054231/http://www.electoralcalculus.co.uk/electdata_1983.txt|archive-date=15 October 2011}}}}

{{Election box winning candidate with party link|

|party = Ulster Unionist Party

|candidate = James Molyneaux

|votes = 24,017

|percentage = 59.2

|change =

}}

{{Election box candidate with party link|

|party = Democratic Unionist Party

|candidate = William John Beattie

|votes = 6,801

|percentage = 16.8

|change =

}}

{{Election box candidate with party link|

|party = Alliance Party of Northern Ireland

|candidate = Seamus Close

|votes = 4,593

|percentage = 11.3

|change =

}}

{{Election box candidate with party link|

|party = Social Democratic and Labour Party

|candidate = Cormac Joseph Boomer

|votes = 2,603

|percentage = 6.4

|change =

}}

{{Election box candidate with party link|

|party = Sinn Féin

|candidate = Richard McAuley

|votes = 1,751

|percentage = 4.3

|change =

}}

{{Election box candidate with party link|

|party = Workers' Party (Ireland)

|candidate = Gerard Loughlin

|votes = 809

|percentage = 2.0

|change =

}}

{{Election box majority|

|votes = 17,216

|percentage = 42.4

|change =

}}

{{Election box turnout|

|votes = 40,574

|percentage = 67.6

|change =

}}

{{Election box registered electors|

|reg. electors = 60,051

}}

{{Election box new seat win|

|winner = Ulster Unionist Party

}}

{{Election box end}}

• List of parliamentary constituencies in Northern Ireland

{{Reflist}}

• [http://researchbriefings.files.parliament.uk/documents/CBP-7979/CBP-7979.pdf 2017 Election] House of Commons Library 2017 Election report
• [http://www.visionofbritain.org.uk/ A Vision Of Britain Through Time] (Constituency elector numbers)
• [https://mapit.mysociety.org/area/66132.html Lagan Valley UK Parliament constituency] (boundaries April 2010 – May 2024) at MapIt UK
• [https://mapit.mysociety.org/area/169025.html Lagan Valley UK Parliament constituency] (boundaries from June 2024) at MapIt UK

{{Current Westminster constituencies in Northern Ireland}}

{{County Antrim constituencies}}

{{County Down constituencies}}

{{Authority control}}

{{Coord|54.509|-6.047|display=title|region:GB_scale:50000}}

Category:Westminster Parliamentary constituencies in Northern Ireland

Category:Constituencies of the Parliament of the United Kingdom established in 1983

Category:Politics of County Antrim

Category:Politics of County Down