56th Parliament of the United Kingdom By-elections
- 3 December 2015 - Oldham West and Royton
- 5 May 2016 - Ogmore
- 5 May 2016 - Sheffield, Brightside and Hillsborough
- 16 June 2016 - Tooting
- 20 October 2016 - Batley and Spen
- 20 October 2016 - Witney
- 1 December 2016 - Richmond Park
- 8 December 2016 - Sleaford and North Hykeham
- 23 February 2017 - Copeland
- 23 February 2017 - Stoke-on-Trent Central
Read the House of Commons Library briefing on by-elections in the 56th Parliament.