List of parliamentary gains and losses in the 2015 United Kingdom general election
# List of parliamentary gains and losses in the 2015 United Kingdom general election

This is a list of parliamentary constituencies that changed political allegiance in the United Kingdom general election on 7 May 2015. This includes those seats that changed parties in by-elections but were regained on 7 May. It does not include those where a new member has been elected from the same party as the previous incumbent.

## Constituencies

| Constituency | Region | Party of incumbent before election | Party of incumbent after election |
| - | - | - | - |
| Aberdeen South | Scotland | Labour | Scottish National Party |
| Airdrie and Shotts | Scotland | Labour | Scottish National Party |
| Ayr, Carrick and Cumnock | Scotland | Labour | Scottish National Party |
| Bath | South West | Liberal Democrats | Conservative Party |
| Belfast East | Northern Ireland | Alliance | Democratic Unionist Party |
| Bermondsey and Old Southwark | London | Liberal Democrats | Labour Party |
| Berwick-upon-Tweed | North East | Liberal Democrats | Conservative Party |
| Berwickshire, Roxburgh and Selkirk | Scotland | Liberal Democrats | Scottish National Party |
| Birmingham, Yardley | West Midlands | Liberal Democrats | Labour Party |
| Bolton West | North West | Labour | Conservative Party |
| Bradford East | Yorkshire and the Humber | Liberal Democrats | Labour Party |
| Bradford West | Yorkshire and the Humber | Respect | Labour Party |
| Brecon and Radnorshire | Wales | Liberal Democrats | Conservative Party |
| Brent Central | London | Liberal Democrats | Labour Party |
| Brentford and Isleworth | London | Conservative | Labour Party |
| Bristol West | South West | Liberal Democrats | Labour Party |
| Burnley | North West | Liberal Democrats | Labour Party |
| Caithness, Sutherland and Easter Ross | Scotland | Liberal Democrats | Scottish National Party |
| Cambridge | Eastern | Liberal Democrats | Labour Party |
| Cardiff Central | Wales | Liberal Democrats | Labour Party |
| Central Ayrshire | Scotland | Labour | Scottish National Party |
| Cheadle | North West | Liberal Democrats | Conservative Party |
| Cheltenham | South West | Liberal Democrats | Conservative Party |
| Chippenham | South West | Liberal Democrats | Conservative Party |
| City of Chester | North West | Conservative | Labour Party |
| Coatbridge, Chryston and Bellshill | Scotland | Labour | Scottish National Party |
| Colchester | Eastern | Liberal Democrats | Conservative Party |
| Corby | East Midlands | Labour Co-operative | Conservative Party |
| Cumbernauld, Kilsyth and Kirkintilloch East | Scotland | Labour | Scottish National Party |
| Derby North | East Midlands | Labour | Conservative Party |
| Dewsbury | Yorkshire and the Humber | Conservative | Labour Party |
| Dumfries and Galloway | Scotland | Labour | Scottish National Party |
| Dundee West | Scotland | Labour | Scottish National Party |
| Dunfermline and West Fife | Scotland | Labour | Scottish National Party |
| Ealing Central and Acton | London | Conservative | Labour Party |
| East Dunbartonshire | Scotland | Liberal Democrats | Scottish National Party |
| East Kilbride, Strathaven and Lesmahagow | Scotland | Labour | Scottish National Party |
| East Lothian | Scotland | Labour | Scottish National Party |
| East Renfrewshire | Scotland | Labour | Scottish National Party |
| Eastbourne | South East | Liberal Democrats | Conservative Party |
| Eastleigh | South East | Liberal Democrats | Conservative Party |
| Edinburgh East | Scotland | Labour | Scottish National Party |
| Edinburgh North and Leith | Scotland | Labour Co-operative | Scottish National Party |
| Edinburgh South West | Scotland | Labour | Scottish National Party |
| Edinburgh West | Scotland | Liberal Democrats | Scottish National Party |
| Enfield North | London | Conservative | Labour Party |
| Falkirk | Scotland | Labour | Scottish National Party |
| Fermanagh and South Tyrone | Northern Ireland | Sinn Féin | Ulster Unionist Party |
| Glasgow Central | Scotland | Labour | Scottish National Party |
| Glasgow East | Scotland | Labour | Scottish National Party |
| Glasgow North | Scotland | Labour | Scottish National Party |
| Glasgow North East | Scotland | Labour | Scottish National Party |
| Glasgow North West | Scotland | Labour | Scottish National Party |
| Glasgow South | Scotland | Labour | Scottish National Party |
| Glasgow South West | Scotland | Labour Co-operative | Scottish National Party |
| Glenrothes | Scotland | Labour | Scottish National Party |
| Gordon | Scotland | Liberal Democrats | Scottish National Party |
| Gower | Wales | Labour | Conservative Party |
| Hazel Grove | North West | Liberal Democrats | Conservative Party |
| Hornsey and Wood Green | London | Liberal Democrats | Labour Party |
| Hove | South East | Conservative | Labour Party |
| Ilford North | London | Conservative | Labour Party |
| Inverclyde | Scotland | Labour | Scottish National Party |
| Inverness, Nairn, Badenoch and Strathspey | Scotland | Liberal Democrats | Scottish National Party |
| Kilmarnock and Loudoun | Scotland | Labour Co-operative | Scottish National Party |
| Kingston and Surbiton | London | Liberal Democrats | Conservative Party |
| Kirkcaldy and Cowdenbeath | Scotland | Labour | Scottish National Party |
| Lanark and Hamilton East | Scotland | Labour | Scottish National Party |
| Lancaster and Fleetwood | North West | Conservative | Labour Party |
| Lewes | South East | Liberal Democrats | Conservative Party |
| Linlithgow and East Falkirk | Scotland | Labour | Scottish National Party |
| Livingston | Scotland | Labour | Scottish National Party |
| Mid Dorset and North Poole | South West | Liberal Democrats | Conservative Party |
| Midlothian | Scotland | Labour | Scottish National Party |
| Morley and Outwood | Yorkshire and the Humber | Labour Co-operative | Conservative Party |
| Motherwell and Wishaw | Scotland | Labour | Scottish National Party |
| North Ayrshire and Arran | Scotland | Labour | Scottish National Party |
| North Cornwall | South West | Liberal Democrats | Conservative Party |
| North Devon | South West | Liberal Democrats | Conservative Party |
| North East Fife | Scotland | Liberal Democrats | Scottish National Party |
| Norwich South | Eastern | Liberal Democrats | Labour Party |
| Paisley and Renfrewshire North | Scotland | Labour | Scottish National Party |
| Paisley and Renfrewshire South | Scotland | Labour | Scottish National Party |
| Plymouth, Moor View | South West | Labour | Conservative Party |
| Portsmouth South | South East | Liberal Democrats | Conservative Party |
| Redcar | North East | Liberal Democrats | Labour Co-operative |
| Rochester and Strood | South East | UKIP | Conservative Party |
| Ross, Skye and Lochaber | Scotland | Liberal Democrats | Scottish National Party |
| Rutherglen and Hamilton West | Scotland | Labour Co-operative | Scottish National Party |
| Solihull | West Midlands | Liberal Democrats | Conservative Party |
| Somerton and Frome | South West | Liberal Democrats | Conservative Party |
| South Antrim | Northern Ireland | DUP | Ulster Unionist Party |
| Southampton Itchen | South East | Labour | Conservative Party |
| St Austell and Newquay | South West | Liberal Democrats | Conservative Party |
| St Ives | South West | Liberal Democrats | Conservative Party |
| Stirling | Scotland | Labour | Scottish National Party |
| Sutton and Cheam | London | Liberal Democrats | Conservative Party |
| Taunton Deane | South West | Liberal Democrats | Conservative Party |
| Telford | West Midlands | Labour | Conservative Party |
| Thornbury and Yate | South West | Liberal Democrats | Conservative Party |
| Torbay | South West | Liberal Democrats | Conservative Party |
| Twickenham | London | Liberal Democrats | Conservative Party |
| Vale of Clwyd | Wales | Labour | Conservative Party |
| Wells | South West | Liberal Democrats | Conservative Party |
| West Aberdeenshire and Kincardine | Scotland | Liberal Democrats | Scottish National Party |
| West Dunbartonshire | Scotland | Labour Co-operative | Scottish National Party |
| Wirral West | North West | Conservative | Labour Party |
| Wolverhampton South West | West Midlands | Conservative | Labour Party |
| Yeovil | South West | Liberal Democrats | Conservative Party |
