Fifty-sixth Parliament of the United Kingdom
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Palace of Westminster
Overview
Legislative body	Parliament of the United Kingdom
Election	United Kingdom general election, 2015
Government	May ministry —Second Cameron ministry – until 13 July 2016
House of Commons
Members	650
Speaker	John Bercow
Leader	David Lidington — Chris Grayling – until 14 July 2016
Prime Minister	Theresa May — David Cameron – until 13 July 2016
Leader of the Opposition	Jeremy Corbyn — Harriet Harman – acting until 12 September 2015
Third-party leader	Angus Robertson
House of Lords
Members	780
Lord Speaker	The Baroness D'Souza
Leader	The Baroness Stowell of Beeston
Leader of the Opposition	The Baroness Smith of Basildon
Third-party leader	The Lord Wallace of Tankerness
Crown-in-Parliament	Queen Elizabeth II
Sessions
1st 27 May 2015 (2015-05-27) –

The fifty-sixth Parliament of the United Kingdom is the legislature of the United Kingdom following the 2015 general election of Members of Parliament (MPs) to the House of Commons. Parliament, which consists of the House of Lords and the elected House of Commons, was convened on 27 May 2015 at the Palace of Westminster by Queen Elizabeth II.

The election saw each of Parliament's 650 constituencies return one MP to the House of Commons. It resulted in a Conservative majority, a massive loss of seats for the Liberal Democrats, and all but three Scottish seats going to the SNP.

UKIP won its first seat at a general election. Alliance and Respect each had their representation from the last Parliament wiped out. The UUP won representation after none in the previous Parliament.

House of Commons composition

Below is a graphical representation of the House of Commons showing a comparison of party strengths as it was directly after the 2015 general election. This is not a seating plan of the House of Commons, which has five rows of benches on each side, with the government party to the right of the Speaker and opposition parties to the left, but with room for only around two-thirds of MPs to sit at any one time.

This table shows the number of MPs in each party:

Affiliation		Members
		Elected in 2019[1]	At dissolution in 2024[2][3][4][a]	Difference
	Conservative	365	344	21
	Labour[b]	202	205	3
	SNP	48	43	5
	Liberal Democrats	11	15	4
	DUP	8	7	1
	Sinn Féin	7	7
	Plaid Cymru	4	3	1
	SDLP	2	2
	Alba	N/A[c]	2[d]	2
	Green	1	1
	Alliance	1	1
	Workers Party	N/A[c]	1	1
	Reform UK[e]	0	1	1
	Speaker	1	1
	Independent	0	15[f]	15
Vacant		0	0
Total		650	650
Effective total voting[g]		639	638	1[h]
Majority		87	44[11]	43

For full details of changes during the 2019-2024 Parliament, see By-elections and Defections, suspensions and resignations.

List of MPs elected in the general election

The following table is a list of MPs elected, ordered by constituency.

Names of incumbents are listed where they stood for re-election; for details of defeated new candidates and the incumbent who stood down in those cases see individual constituency articles.