By-elections in the 2010-2015 Parliament
This page gives details of the UK parliamentary by-elections that took place in the 2010-2015 Parliament.
| Constituency | Reason for by-election | Date of by-election | New Member |
| Rochester and Strood | Resignation of Mark Reckless 30.09.14 | 20 November 2014 | Mark Reckless (UK Independence Party Win) |
| Heywood and Middleton | Death of Jim Dobbin 07.09.14 | 9 October 2014 | Liz McInnes (Labour Hold) |
| Clacton | Resignation of Douglas Carswell 29.08.14 | 9 October 2014 | Douglas Carswell (UK Independence Party Win) |
| Newark | Resignation of Patrick Mercer 30.04.14 | 5 June 2014 | Robert Jenrick (Conservative Win) |
| Wythenshawe and Sale East | Death of Paul Goggins | 13 February 2014 | Michael Kane (Labour Hold) |
| South Shields | Resignation of David Miliband | 2 May 2013 | Emma Lewell-Buck (Labour Hold) |
| Eastleigh | Resignation of Chris Huhne 05.02.13 | 28 February 2013 | Mike Thornton (Lib Dem Hold) |
| Mid-Ulster | Resignation of Martin McGuiness | 7 March 2013 | Francie Molloy (Sinn Fein Hold) |
| Rotherham | Resignation of Rt Hon Denis MacShane 05.11.12 | 29 November 2012 | Sarah Champion (Labour Hold) |
| Manchester Central | Resignation of Tony Lloyd 22.10.12 | 15 November 2012 | Lucy Powell (Labour Hold) |
| Cardiff South and Penarth | Resignation of Rt Hon Alun Michael 22.10.12 | 15 November 2012 | Stephen Doughty (Labour/Co-op Hold) |
| Middlesbrough | Death of Sir Stuart Bell 13.10.12 | 29 November 2012 | Andy McDonald (Labour Hold) |
| Croydon North | Death of Malcolm Wicks 29.09.12 | 29 November 2012 | Steve Reed (Labour Hold) |
| Corby | Resignation of Louise Mensch 29.08.12 | 15 November 2012 | Andy Sawford (Labour/Co-op Win) |
| Bradford West | Resignation of Marsha Singh 02.03.12 | 29 March 2012 | George Galloway (Respect Win) |
| Feltham and Heston | Death of Alan Keen 14.11.11 | 15 December 2011 | Seema Malhotra (Labour Hold) |
| Inverclyde | Death of David Cairns | 30 June 2011 | Iain McKenzie (Labour Hold) |
| Leicester South | Resignation of Sir Peter Soulsby 01.04.11 | 5 May 2011 | Jon Ashworth (Labour hold) |
| Barnsley Central | Resignation of Eric Illsley | 3 March 2011 | Dan Jarvis (Labour hold) |
| Belfast West | Resignation of Mr Gerry Adams | 9 June 2011 | Paul Maskey (Sinn Fein Hold) |
| Oldham East and Saddleworth | Previous election declared void 05.11.10 | 13 January 2011 | Debbie Abrahams (Labour hold) |
House of Commons Library analysis
The House of Commons Library produces briefing papers to inform MPs and their staff of key issues. The papers contain factual information and a range of opinions on each subject, and aim to be politically impartial.