Leader of the Opposition (United Kingdom)

Leader of His Majesty's Most Loyal Opposition
Incumbent Kemi Badenoch since 2 November 2024
Official Opposition Parliament of the United Kingdom Leader of the Opposition's Office
Style	Leader of the Opposition (informal) The Right Honourable (formal)
Member of	House of Commons Shadow Cabinet Privy Council
Appointer	Largest political party in the House of Commons that is not in government, serves at the pleasure of His Majesty.
Term length	While leader of the largest political party in the House of Commons that is not in government
Inaugural holder	The Lord Grenville
Formation	March 1807 1 July 1937 (Statutory)
Deputy	Deputy Leader of the Opposition
Salary	£144,649[1] (including £91,346 MP salary[2])
Website	His Majesty's Official Opposition: The Shadow Cabinet

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The Leader of His Majesty's Most Loyal Opposition, more commonly referred to as the Leader of the Opposition, is the person who leads the Official Opposition in the United Kingdom. The position is seen as the shadow head of government of the United Kingdom and thus the shadow prime minister of the United Kingdom.

Originally by convention, the Leader of the Opposition is the leader of the largest political party in the House of Commons that is not in government. When a single party wins outright, this is the party leader of the second-largest political party in the House of Commons. The role has since been codified by statute.^[3]

The Leader of the Opposition is often viewed as an alternative or shadow prime minister, and is appointed to the Privy Council. They lead an Official Opposition Shadow Cabinet, which scrutinises the actions of the Cabinet and offers alternative policies.

In the nineteenth century, party affiliations were generally less fixed and the leaders in the two Houses were often of equal status. A single and clear Leader of the Opposition was only definitively settled if the opposition leader in the House of Commons or House of Lords was the outgoing prime minister. However, since the Parliament Act 1911, there has been no dispute that the leader in the House of Commons is pre-eminent and has always held the primary title. The Leader of the Opposition is entitled to a salary in addition to their salary as a Member of Parliament. In 2019, this additional entitlement was available up to £65,181.^[1]

The role is considered by those who have held it as the worst and most difficult job in politics,^[4][5] with Prime Minister Tony Blair and then-Leader of the Opposition William Hague agreeing that the opposition role was the harder job of the two positions.^[6]

The incumbent Leader of the Opposition is Kemi Badenoch, the Leader of the Conservative Party, following the 2024 Conservative Party leadership election.

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The first modern Leader of the Opposition was Charles James Fox, who led the Whigs as such for a generation, except during the Fox–North Coalition in 1783. He finally rejoined the government in the Ministry of All the Talents formed in 1806 and died later that year.

For there to be a recognized Leader of the Opposition, it is necessary for there to be a sufficiently cohesive opposition to need a formal leader. The emergence of the office thus coincided with the period when wholly united parties (Whig and Tory, governments and oppositions) became the norm.^[7] This situation was normalized in the Parliament of 1807–1812 when the members of the Grenvillite and Foxite Whig factions resolved to maintain a joint, dual-house leadership for the whole party.

The Ministry of all the Talents, in which both Whig factions participated fell at the 1807 general election, during which the Whigs had re-adopted traditional factions, forming an opposition. The prime minister of the Talents ministry, Lord Grenville had led his eponymous faction from the House of Lords. Meanwhile, the government leader of the House of Commons, Viscount Howick (later known as Earl Grey and the political heir of Charles James Fox who had died in 1806), led his faction, the Foxite whigs, from the House of Commons.^[7]

Howick's father, the 1st Earl Grey died on 14 November 1807. As such the new Earl Grey vacated his seat in the House of Commons and moved to the House of Lords. This left no obvious Whig leader in the House of Commons.^[7]

Grenville's article in the Oxford Dictionary of National Biography confirms that he was considered the Whig leader in the House of Lords between 1807 and 1817, despite Grey leading the larger faction.

Grenville and Grey, political historian Archibald Foord describe as being "duumvirs of the party from 1807 to 1817" and consulted about what was to be done. Grenville was at first reluctant to name a leader of the opposition in the House of Commons, commenting "... all the elections in the world would not have made Windham or Sheridan leaders of the old Opposition while Fox was alive ...".

Eventually, they jointly recommended George Ponsonby to the Whig MPs, whom they accepted as the first leader of the opposition in the House of Commons. Ponsonby, an Irish lawyer who was the uncle of Grey's wife, had been Lord Chancellor of Ireland during the Ministry of all the Talents and had only just been re-elected to the House of Commons in 1808 when he became leader.^[7] Ponsonby proved a weak leader but as he could not be persuaded to resign and the duumvirs did not want to depose him, he remained in place until he died in 1817.^[7]

Lord Grenville retired from active politics in 1817, leaving Grey as the leader of the opposition in the House of Lords. Grey was not a former prime minister in 1817, unlike Grenville, so under the convention that developed later in the century he would have been in the theory of equal status to whoever was a leader in the other House. However, there was little doubt that if a Whig ministry was possible, Grey rather than the less distinguished Commons leaders would have been invited to form that government. In this respect Grey's position was like that of the Earl of Derby in the Protectionist Conservative opposition of the late 1840s and early 1850s.^[7]

Earl Grey witnessed a delay of about a year, until 1818, before a new leader of the opposition in the House of Commons was chosen. This was George Tierney who was reluctant to accept the leadership and had weak support from his party. On 18 May 1819, Tierney moved a motion in the Commons for a committee on the state of the nation. This motion was defeated by 357 to 178, a division involving the largest number of MPs until the debates over the Reform bill in the early 1830s. Foord comments that "this defeat put an effective end to Tierney's leadership ... Tierney did not disclaim the leadership till 23 Jan. 1821 ..., but he had ceased to exercise its functions since the great defeat".

Between 1821 and 1830 the Whig Commons leadership was left vacant. The leadership in the House of Lords was not much more effective: in 1824 Grey retired from active leadership, asking the party to follow the Marquess of Lansdowne "as the person whom his friends were to look upon as their leader". Lansdowne disclaimed the title of leader, although in practice he performed the function.

Following the retirement of Lord Liverpool from the prime ministership in 1827, the party's political situation changed. Neither the Duke of Wellington or Robert Peel agreed to serve under George Canning and they were followed by five other members of the former Cabinet as well as forty junior members of the previous government. The Tory Party was heavily split between the "High Tories" (or "Ultras", nicknamed after the contemporary party in Restoration France) and the moderates supporting Canning, often called 'Canningites'. As a result, Canning found it difficult to maintain a government and chose to invite a number of Whigs to join his Cabinet, including Lord Lansdowne. After Canning's death, Lord Goderich continued the coalition for a few more months. The principal opposition between April 1827 and January 1828 worked with these brief administrations, although Earl Grey and a section of the Whigs were also in opposition to the coalition government. It was during this period that the term "His Majesty's Opposition" for the Opposition was coined, by John Cam Hobhouse.^[8]

The Duke of Wellington formed a ministry in January 1828 and as a direct effect of adopting in earnest the policy of Catholic Emancipation the opposition became composed of most Whigs with many Canningites and some ultra-Tories. Lord Lansdowne, in the absence of any alternative, remained the leading figure in the Whig opposition.

In 1830 Grey returned to the front rank of politics. On 30 June 1830, he denounced the government in the House of Lords. He rapidly attracted the support of opponents of the ministry. The renewal of organized opposition was also bolstered earlier in the year by the election of a new leader of the opposition in the House of Commons, the heir of Earl Spencer, Viscount Althorp.

In November 1830 Grey was invited to form a government and resumed the formal leadership of the party and as such Wellington and Peel became the leaders of the opposition in the two Houses, from November 1830.

In the period of 1830–1937, the normal expectation was that there would be two leading parties (often with smaller allied groups), of which one would form the government and the other the opposition.^[9] These parties were expected to have recognized leaders in the two Houses, so there was normally no problem in identifying who led the opposition in each House.

The constitutional convention developed in the nineteenth century was that if one of the leaders was the last prime minister of the party, then he would be considered the overall leader of his party. If that was not the case then the leaders of both Houses were of equal status. As the monarch retained some discretion as to which leader should be invited to form a ministry, it was not always obvious in advance which one would be called upon to do so.

However, as the leadership of the opposition only existed by custom, the normal expectations and conventions were modified by political realities from time to time.

From 1830 until 1846 the Tory/Conservative Party and the Whig Party (increasingly often described with its Radical and other allies as the Liberal Party) alternated in power and provided clear leaders of the opposition.

In 1846 the Conservative Party split into (Protectionist) Conservative and Peelite (or Liberal Conservative) factions. The Protectionists being the larger group, the recognized leaders of the opposition were drawn from their ranks. In the House of Lords, Lord Stanley (soon becoming Earl of Derby) was the Protectionist leader. He was the only established front-rank political figure in the faction and thus a very strong candidate to form the next Conservative ministry.

The leadership in the House of Commons was more problematic. Lord George Bentinck, the leader of the Protectionist revolt against Sir Robert Peel, initially led the party in the Commons. He resigned in December 1847. The party was then faced with the problem of how to produce a credible leader, who was not Benjamin Disraeli. The first attempt to square the circle was made in February 1848, when the young Marquess of Granby was installed as the leader. He gave up the post in March 1848. The leadership then fell vacant until February 1849.

The next experiment was to entrust the leadership to a triumvirate of Granby, Disraeli, and the elderly John Charles Herries. In practice, Disraeli ignored his co-triumvirs. In 1851 Granby resigned and the party accepted Disraeli as the sole leader. The Protectionists by then were clearly the core of the Conservative Party and Derby was able to form his first government in 1852.

The Liberal Party was formally founded in 1859, replacing the Whig Party as one of the two leading parties. With increasing party discipline it became easier to define the principal opposition party and the leaders of the opposition.

The last overall leader of the opposition to have led it from the House of Lords was the Earl of Rosebery. He resigned as such in November 1896. Lord Rosebery had been Liberal prime minister from 1894 to 1895.

The Parliament Act 1911 removed the legislative veto from the House of Lords to permit the welfare-state forming Liberal legislation to be enacted by the Commons, the People's Budget and any future Money Bills without any input from the Lords. This, therefore, entrenched the de facto position that there could only be one true leader of the opposition and in effect clarified in which house that leader would need to sit. From this point, all leaders of the opposition in the House of Commons would thus be overall leaders of the opposition.

In 1915 the Liberal, Conservative and Labour parties formed a coalition. The Irish Parliamentary Party did not join the government but were by and large not in opposition to it. As almost nobody in the Parliament could be said to be in opposition to the coalition, the leadership of the opposition in both Houses fell vacant.

Sir Edward Carson, the leading figure among the Irish Unionist part of the Conservative and Unionist Party, resigned from the coalition ministry on 19 October 1915. He then became the leader of those Unionists who were not members of the government, effectively the leader of the opposition in the Commons.

The party situation changed in December 1916: a leading Liberal, David Lloyd George, formed a coalition with the support of a section of "Coalition Liberal", Conservative and Labour parties. The Leader of the Liberal Party, H. H. Asquith, and most of his leading colleagues left the government and took up seats on the opposition side of the House of Commons. Asquith was recognized as the leader of the opposition. He retained that post until he was defeated in the 1918 United Kingdom general election. Although Asquith continued to be the leader of the Liberal Party, as he was not a member of the House of Commons he was not eligible to be the leader of the opposition until returned in the 1920 Paisley by-election.

The Parliament elected in December 1918 which sat from 1919 until 1922, represents the most significant deviation from the principle that the leader of the opposition is the leader of the party not in government with the greatest numerical support in the House of Commons. The largest opposition party (disregarding Sinn Féin, whose abstentionist MPs did not take their seats at Westminster), was the Labour Party which had wholly left the Lloyd George coalition and won 57 seats at the general election. Thirty-six Liberals had been elected without coalition support; however, they were mixed in their opposition to Lloyd George. The Labour Party did not have a Leader until 1922. The Parliamentary Labour Party annually elected a chairman, but the party, due to its congressional origins, refused to assert a claim that the chairman was the leader of the opposition. Although the issue of who was entitled to be the leader of the opposition was never formally resolved, in practice the Opposition Liberal leader performed most of the parliamentary functions associated with the office.

The small group of opposition Liberals met in 1919, distanced by his coalition's protectionism and nationalization. They resolved that they were the Liberal Parliamentary Party. They elected Sir Donald Maclean as Chairman of the Parliamentary Party. Liberal Party practice at the time, when the overall leader of the party had lost an election to the House of Commons, was for the chairman to function as acting leader in the House. Maclean, therefore, took on the role of leader of the opposition, followed by Asquith, who returned to the House by winning a by-election (1920–22).

From 1922 the Labour Party had a recognized leader so took over all remaining commons opposition roles from the Opposition Liberal Party. Since 1922 the principal Government and Opposition parties have been the Labour Party and the Conservative Party. There were three instances of peers being seriously considered for the prime ministership, during the twentieth century (Lord Curzon of Kedleston in 1923, Lord Halifax in 1940 and Lord Home in 1963), but these were all cases where the Conservative Party was in government and do not affect the list of leaders of the opposition.

In 1931–32 the Leader of the Labour Party was Arthur Henderson. He was the leader of the opposition for a short period in 1931 but was ineligible to continue when he lost his seat in the 1931 general election. George Lansbury was the leader of the opposition before he also became the leader of the Labour Party in 1932.

Leaders of the opposition in the two Houses of Parliament had been generally recognized and given a special status in Parliament for more than a century before they were mentioned in legislation.

Erskine May: Parliamentary Practice confirms that the office of the leader of the opposition was first given statutory recognition in the Ministers of the Crown Act 1937.

• Section 5 states that "There shall be paid to the Leader of the Opposition an annual salary of two thousand pounds".
• Section 10(1) includes a definition (which codifies the usual situation under the previous custom) "Leader of the Opposition" means that member of the House of Commons who is for the time being the leader in that House of the party in opposition to His Majesty's Government having the greatest numerical strength in that House".
• The 1937 Act also contains an important provision to decide who is the Leader of the Opposition, if this is in doubt. Under section 10(3) "If any doubt arises as to which is or was at any material time the party in opposition to His Majesty's Government having the greatest numerical strength in the House of Commons, or as to who is or was at any material time the leader in that House of such a party the question shall be decided for the purposes of this Act by the Speaker of the House of Commons, and his decision, certified in writing under his hand, shall be final and conclusive".

Subsequent legislation also gave statutory recognition to the leader of the opposition in the House of Lords.

• Section 2(1) of the Ministerial and other Salaries Act 1975, provides that "In this Act "Leader of the Opposition" means, in relation to either House of Parliament, that member of that House who is for the time being the Leader in that House of the party in opposition to His Majesty's Government having the greatest numerical strength in the House of Commons".
• Section 2(2) is in exactly the same terms as section 10(3) of the 1937 Act.
• Section 2(3) is a corresponding provision for the Lord Chancellor (since 2005, the Lord Speaker) to decide about the Leader of the Opposition in the House of Lords.

The legislative provisions confirm that the leader of the opposition is, strictly, a Parliamentary office; so that to be a leader a person must be a member of the House in which he or she leads.

Since 1937 the leader of the opposition has received a state salary in addition to their salary as a Member of Parliament (MP), now equivalent to a Cabinet Minister. The holder also receives a chauffeur-driven car for official business of equivalent cost and specification to the vehicles used by most cabinet ministers.

In 1940 the three largest parties in the House of Commons formed a coalition government to continue to prosecute the Second World War. This coalition continued in office until shortly after the defeat of Nazi Germany in 1945. As the former leader of the opposition had joined the government the issue arose of who was to hold the office or perform its functions. Keesing's Contemporary Archives 1937–1940 (at paragraph 4069D) reported the situation, based on Hansard:

The Prime Minister replying to Mr. Denman in the House of Commons on 21 May, said that in view of the formation of an Administration embracing the three main political parties, H.M. Government was of the opinion that the provision of the Ministers of the Crown Act, 1937, relating to the payment of a salary to the leader of the opposition was in abeyance for the time being, as there was no alternative party capable of forming a Government. He added that he did not consider amending legislation necessary.

The Daily Herald reported that the Parliamentary Labour Party met on 22 May 1940 and unanimously elected Dr H.B. Lees-Smith as Chairman of the PLP (an office normally held by the party leader at that time) and as spokesman of the Party from the opposition front bench.

After the death of Lees-Smith, on 18 December 1941, the PLP with Patrick McFadden acting as chairman, held a meeting on 21 January 1942. Frederick Pethick-Lawrence was unanimously elected Chairman of the PLP and the official spokesman of the party in the House of Commons while the party leader was serving in the government. After the Deputy Leader of the Labour Party (Arthur Greenwood) left the government on 22 February 1942 he took over these roles from Pethick-Lawrence until the end of the coalition and the resumption of normal party politics.

The table lists the people who were, or who acted as, leaders of the opposition in the two Houses of Parliament since 1807, prior to which the post was held by Charles James Fox for decades.

The leaders of the two Houses were of equal status, before 1911, unless one was the most recent Prime Minister for the party. Such a former prime minister was considered to be the overall leader of the opposition. From 1911 the Leader of the Opposition in the House of Commons was considered to be the overall Leader of the Opposition. Overall leaders names are bolded. Acting leaders names are in italics unless the acting leader subsequently became a full leader during a continuous period as leader.

Due to the fragmentation of both principal parties in 1827–30, the leaders and principal opposition parties suggested for those years are provisional.

Principal party of opposition		Leader of the Opposition House of Commons		Leader of the Opposition House of Lords		Date
	Whig		Viscount Howick[a]		The Lord Grenville[b]	May 1807
			Vacant			14 November 1807
			George Ponsonby[c]			1808
			Vacant			8 July 1817
					The Earl Grey[a] (formerly Viscount Howick)	1817
			George Tierney			1818
			Vacant			23 January 1821
					The Marquess of Lansdowne[d]	1824
	High Tory		Sir Robert Peel[a]		The Duke of Wellington[e]	April 1827
	Whig		Vacant		The Marquess of Lansdowne[d]	January 1828
			Viscount Althorp			February 1830
	Tory		Sir Robert Peel[a]		The Duke of Wellington[e]	November 1830
	Whig		Lord John Russell[a]		The Viscount Melbourne[e]	November 1834
	Conservative		Sir Robert Peel[e]		The Duke of Wellington[b]	April 1835
	Whig		Lord John Russell[a]		The Viscount Melbourne[b]	August 1841
					The Marquess of Lansdowne	October 1842
	Protectionist Conservative		Lord George Bentinck		The Lord Stanley of Bickerstaffe[a] (The Earl of Derby from 1851)	June 1846
			Marquess of Granby			10 February 1848
			Vacant			4 March 1848
			Marquess of Granby; John Charles Herries; and Benjamin Disraeli[a]			February 1849
			Benjamin Disraeli[a]			1851
	Whig		Lord John Russell[e]		The Marquess of Lansdowne	February 1852
	Conservative		Benjamin Disraeli[a]		The Earl of Derby[e]	December 1852
	Whig		The Viscount Palmerston[e][f]		The Earl Granville	February 1858
	Conservative		Benjamin Disraeli[a]		The Earl of Derby[e]	June 1859
	Liberal		William Ewart Gladstone[a]		The Earl Russell[b] (formerly Lord John Russell)	June 1866
					The Earl Granville	December 1868
	Conservative		Benjamin Disraeli[e]		The Earl of Malmesbury	December 1868
					The Lord Cairns	February 1869
					The Duke of Richmond	February 1870
	Liberal		William Ewart Gladstone[e]		The Earl Granville	February 1874
			Marquess of Hartington			February 1875
	Conservative		Sir Stafford Northcote		The Earl of Beaconsfield[c][b] (formerly Benjamin Disraeli)	April 1880
					The Marquess of Salisbury[a]	May 1881
	Liberal		William Ewart Gladstone[e]		The Earl Granville	June 1885
	Conservative		Sir Michael Hicks Beach		The Marquess of Salisbury[e]	February 1886
	Liberal		William Ewart Gladstone[e]		The Earl Granville[c]	July 1886
					The Earl of Kimberley	April 1891
	Conservative		Arthur Balfour[a]		The Marquess of Salisbury[e]	August 1892
	Liberal		Sir William Harcourt[g]		The Earl of Rosebery[b][h]	June 1895
					The Earl of Kimberley[c]	January 1897
			Sir Henry Campbell-Bannerman[a]			6 February 1899
					The Earl Spencer	1902
					The Marquess of Ripon	1905
	Conservative		Arthur Balfour[b][i]		The Marquess of Lansdowne (Liberal Unionist Party until 1912)	5 December 1905
			Joseph Chamberlain (Liberal Unionist Party)			1906
			Arthur Balfour[b]			1906
			Bonar Law[a]			13 November 1911

List of leaders of the opposition since the Parliament Act

Portrait		Leader of the Opposition	Term of office			Elections	Party	Shadow cabinet
			Start	End	Duration
		Bonar Law[a]	13 November 1911	25 May 1915	3 years, 194 days	—	Conservative (Scot.U.)
		Sir Edward Carson[j]	19 October 1915	6 December 1916	1 year, 49 days	—	Conservative (Irish U.)
		H. H. Asquith[b][k]	6 December 1916	14 December 1918	2 years, 9 days	1918	Independent Liberal
		Sir Donald Maclean[l]	14 December 1918	12 February 1920	1 year, 61 days	—
		H. H. Asquith[b]	12 February 1920	21 November 1922	2 years, 283 days	1922
		Ramsay MacDonald[a]	21 November 1922	22 January 1924	1 year, 63 days	1923	Labour
		Stanley Baldwin[e]	22 January 1924	4 November 1924	288 days	1924	Conservative
		Ramsay MacDonald[e]	4 November 1924	5 June 1929	4 years, 214 days	1929	Labour
		Stanley Baldwin[e]	5 June 1929	24 August 1931	2 years, 81 days	—	Conservative
		Arthur Henderson[m]	1 September 1931	25 October 1932	1 year, 55 days	1931	Labour
		George Lansbury[n]	25 October 1932	8 October 1935	3 years, 349 days	—
		Clement Attlee[a][o]	25 October 1935	11 May 1940	4 years, 200 days	1935
		Hastings Lees-Smith[c][p]	22 May 1940	18 December 1941	1 year, 211 days	—
		Frederick Pethick-Lawrence[p]	21 January 1942	February 1942	12 days	—
		Arthur Greenwood[p]	February 1942	23 May 1945	3 years, 112 days	—
		Clement Attlee[a]	23 May 1945	26 July 1945	65 days	1945
		Winston Churchill[e]	26 July 1945	26 October 1951	6 years, 93 days	1950	Conservative
						1951
		Clement Attlee[b]	26 October 1951	25 November 1955	4 years, 31 days	1955	Labour
		Herbert Morrison[q]	25 November 1955	14 December 1955	20 days	—
		Hugh Gaitskell[c]	14 December 1955	18 January 1963	7 years, 36 days	1959
		George Brown[q]	18 January 1963	14 February 1963	28 days	—
		Harold Wilson[a]	14 February 1963	16 October 1964	1 year, 246 days	1964		Wilson I
		Sir Alec Douglas-Home[b]	16 October 1964	28 July 1965	286 days	—	Conservative (Scot.U.)	Douglas-Home
		Edward Heath[a]	28 July 1965	19 June 1970	4 years, 327 days	1966	Conservative	Heath I
						1970
		Harold Wilson[e]	19 June 1970	4 March 1974	3 years, 259 days	Feb 1974	Labour	Wilson II
		Edward Heath[b]	4 March 1974	11 February 1975	345 days	Oct 1974	Conservative	Heath II
		Margaret Thatcher[a]	11 February 1975	4 May 1979	4 years, 83 days	1979		Thatcher
		James Callaghan[b]	4 May 1979	10 November 1980	1 year, 191 days	—	Labour	Callaghan
		Michael Foot	10 November 1980	2 October 1983	2 years, 327 days	1983		Foot
		Neil Kinnock	2 October 1983	18 July 1992	8 years, 291 days	1987		Kinnock
						1992
		John Smith[c]	18 July 1992	12 May 1994	1 year, 299 days	—		Smith
		Margaret Beckett[q]	12 May 1994	21 July 1994	71 days	—		Beckett
		Tony Blair[a]	21 July 1994	2 May 1997	2 years, 286 days	1997		Blair
		John Major[b]	2 May 1997	19 June 1997	49 days	—	Conservative	Major
		William Hague	19 June 1997	13 September 2001	4 years, 87 days	2001		Hague
		Iain Duncan Smith	13 September 2001	6 November 2003	2 years, 55 days	—		Duncan Smith
		Michael Howard	6 November 2003	6 December 2005	2 years, 31 days	2005		Howard
		David Cameron[a]	6 December 2005	11 May 2010	4 years, 157 days	2010		Cameron
		Harriet Harman[q]	11 May 2010	25 September 2010	138 days	—	Labour	Harman I
		Ed Miliband	25 September 2010	8 May 2015	4 years, 226 days	2015		Miliband
		Harriet Harman[q]	8 May 2015	12 September 2015	128 days	—		Harman II
		Jeremy Corbyn	12 September 2015	4 April 2020	4 years, 206 days	2017		Corbyn
						2019
		Keir Starmer[a]	4 April 2020	5 July 2024	4 years, 93 days	2024		Starmer
		Rishi Sunak[b]	5 July 2024	2 November 2024	121 days	—	Conservative	Sunak
		Kemi Badenoch	2 November 2024	Incumbent	22 days	—		Badenoch

This list notes each Leader of the Opposition, from the Parliament Act 1911 granting legislative preeminence to the House of Commons,^[10] and the Ministers of the Crown Act 1937 the leader of the second largest faction within it a statutory title and salary,^[11] rather than the customary role as HM Official Opposition,^[12] in order of term length. This is based on the difference between dates; if counted by number of calendar days all the figures would be one greater.

Of the 37 leaders of the opposition listed, seven served more than 5 years, seven have lost more than one general election, and eight have served less than a year.

• Prime Minister of the United Kingdom
• Leader of the Opposition

• British Historical Facts 1760–1830, by Chris Cook and John Stevenson (The Macmillan Press 1980)
• British Historical Facts 1830–1900, by Chris Cook and Brendan Keith (The Macmillan Press 1975)
• His Majesty's Opposition 1714–1830, by Archibald S. Foord (Oxford University Press and Clarendon Press, 1964)
• History of the Liberal Party 1895–1970, by Roy Douglas (Sidgwick & Jackson 1971)
• Oxford Dictionary of National Biography
• Twentieth Century British Political Facts 1900–2000, by David Butler and Gareth Butler (Macmillan Press; 8th edition, 2000)