| Name | Image | Party | First elected | Constituency | Other positions |
|---|
| Charles Abbot |  | Tory | 1801 | Helston (1801–1802) Heytesbury (1802) Woodstock (1802–1806) Oxford University (1806–1817) | Speaker of the House of Commons (1802–1817) Chief Secretary for Ireland (1801–1802) Also member of theParliament of Great Britain Later ennobled asBaron Colchester |
| Diane Abbott |  | Labour | 1987 | Hackney North and Stoke Newington (1987–present) | Shadow Home Secretary (2016–2020) Shadow Health Secretary (2016) Shadow International Development Secretary (2015–2016) Shadow Minister for Public Health (2010–2013) |
| Jack Abbott | | Labour | 2024 | Ipswich (2024–present) | |
| SirWilliam Abdy 7th Baronet of Felix Hall | | Independent | 1817 | Malmesbury (1817–1818) | |
| Alexander Abercromby |  | Independent | 1817 | Clackmannanshire (1817–1818) | |
| George Abercromby | | Independent | 1805 | Edinburgh (1805–1806) Clackmannanshire (1806–1807, 1812–1815) | Lord Lieutenant of Stirlingshire (1837–1843) Later ennobled asBaron Abercromby |
| George Ralph Abercromby | | Independent | 1824 | Clackmannanshire (1824–1826, 1830–1831) Stirlingshire (1838–1841) Clackmannanshire and Kinross-shire (1841–1842) | Lord Lieutenant of Clackmannanshire (1840–1852) Later ennobled asBaron Abercromby |
| James Abercromby |  | Whig | 1807 | Midhurst (1807–1812) Calne (1812–1830) Edinburgh (1832–1839) | Speaker of the House of Commons (1835–1839) Master of the Mint (1834–1835) Lord Chief Baron of the Court of Exchequer (1830–1832) Judge-Advocate-General (1827–1828) Later ennobled asBaron Abercromby |
| SirJohn Abercromby |  | Independent | 1815 | Clackmannanshire (1815–1817) | |
| SirRobert Abercromby 5th Baronet of Birkenbog | | Independent | 1812 | Banffshire (1812–1818) | |
| SirCharles Abney-Hastings 2nd Baronet of Willesley Hall | | Tory | 1826 | Leicester (1826–1831) | High Sheriff of Derbyshire (1825–1826) |
| William Abraham |  | Liberal-Labour | 1885 | Rhondda (1885–1910) | Treasurer of theMiners' Federation of Great Britain (1904–1918) President of theSouth Wales Miners' Federation (1898–1812) |
| Labour | Rhondda (1910–1918) Rhondda West (1918–1918) |
| Debbie Abrahams |  | Labour | 2011 | Oldham East and Saddleworth (2011–present) | Shadow Work and Pensions Secretary (2016–2018) Shadow Minister for Disabled People (2015–2016) |
| Leo Abse | | Labour | 1958 | Pontypool (1958–1983) Torfaen (1983–1987) | Chair of theWelsh Affairs Select Committee (1980–1981) |
| Archibald Acheson 2ndEarl of Gosford |  | Tory | 1801 | County Armagh (1801–1807) | Governor General of British North America (1835–1837) Captain of the Yeomen of the Guard (1934, 1935) Also Member of theParliament of Ireland Later ennobled asBaron Worlingham |
| Archibald Acheson 3rdEarl of Gosford | | Whig | 1830 | Armagh (1830–1847) | Lord Lieutenant of Armagh (1864) Later ennobled asBaron Acheson |
| Benjamin St John Ackers | | Conservative | 1885 | West Gloucestershire (1885–1885) | |
| James Ackers | | Conservative | 1841 | Ludlow (1841–1847) | |
| Thomas Ackroyd | | Liberal | 1923 | Manchester Moss Side (1923–1924) | |
| SirArthur Dyke Acland 13th Baronet of Columb John |  | Liberal | 1885 | Rotherham (1885–1899) | President of the National Liberal Federation (1906–1907) Vice-president of the Committee on Education (1892–1895) |
| SirCharles Thomas Dyke Acland 12th Baronet of Columb John | | Liberal | 1882 | East Cornwall (1882–1885) Launceston (1885–1892) | President of theChurchmen's Union (1908–1915) |
| Francis Dyke Acland 14th Baronet of Columb John |  | Liberal | 1906 | Richmond (1906–1910) North West Cornwall (1910–1922) Tiverton (1923–1924) North Cornwall (1932–1939) | Parliamentary Secretary to the Board of Agriculture and Fisheries (1915–1916) Financial Secretary to the Treasury (1915) Under-Secretary of State for Foreign Affairs (1911–1915) Financial Secretary to the War Office (1908–1910, 1911) |
| SirRichard Acland 15th Baronet of Columb John | | Liberal | 1935 | Barnstaple (1935–1942) | Chairman of the Common Wealth Party (1942–1943, 1944–1945) |
| Common Wealth | Barnstaple (1942–1945) |
| Labour | Gravesend (1947–1955) |
| SirThomas Dyke Acland 10th Baronet of Columb John |  | Tory | 1812 | Devon (1812–1818,1820–1831) | |
| Conservative | North Devon (1837–1857) |
| SirThomas Dyke Acland 11th Baronet of Columb John |  | Conservative | 1837 | West Somerset (1837–1847) | |
| Liberal | Devonshire North (1865–1885) Wellington (1885–1886) | |
| SirGilbert Acland-Troyte |  | Conservative | 1924 | Tiverton (1924–1945) | |
| William a'Court 1st Baronet of Heytesbury | | Tory | 1806 | Heytesbury (1806–1807) | Also Member ofParliament of Great Britain |
| Charles Ashe A'Court-Repington | | Tory | 1820 | Heytesbury (1820–1820) | |
| Edward Henry A'Court-Repington | | Tory | 1820 | Heytesbury (1820–1832) | |
| Conservative | Tamworth (1837–1847) |
| William Acton | | Irish Conservative | 1841 | Wicklow (1841–1848) | |
| SirRobert Adair |  | Whig | 1801 | Appleby (1801–1802) Camelford (1802–1812) | British Ambassador to Belgium (1831–1835) British Ambassador to the Ottoman Empire (1808–1809) British Minister to Austria (1806–1807) Also a Member of theParliament of Great Britain |
| SirCharles Adam |  | Independent | 1831 | Kinross-shire (1831–1832) Clackmannanshire and Kinross-shire (1832–1841) | Lord Lieutenant of Kinross-shire (1839–1853) First Naval Lord (1834, 1841–1844, 1846–1847) |
| Whig |
| Shockat Adam | | Independent | 2024 | Leicester South (2024–present) | |
| William Adam |  | Independent | 1806 | Kincardineshire (1806–1812) | Chancellor of the Duchy of Cornwall (1806–1815) Attorney-General of the Duchy of Cornwall (1805–1816) Solicitor-General of the Duchy of Cornwall (1802–1805) Treasurer of the Ordnance (1780–1782, 1783) Also Member of theParliament of Great Britain |
| William Augustus Adam | | Conservative | 1910 | Woolwich (1910–1910) | |
| SirWilliam Patrick Adam |  | Liberal | 1859 | Clackmannan and Kinross (1859–1880) | Governor of Madras (1880–1881) Paymaster General (1873–1874) First Commissioner of Works (1873–1874, 1880) Lord of the Treasury (1865–1866, 1868–1873) |
| Allen Adams | | Labour | 1979 | Paisley (1979–1983) Paisley North (1983–1990) | |
| Charles Adams | | Tory | 1801 | Weymouth and Melcombe Regis (1801–1812) | |
| David Adams | | Labour | 1922 | Newcastle-upon-Tyne West (1922–1923) Consett (1935–1943) | |
| Gerry Adams |  | Sinn Féin | 1983 | Belfast West (1983–1992,1997–2011) | President ofSinn Féin in theDáil Éireann (2011–2018) President of Sinn Féin (1983–2018) Vice President ofSinn Féin (1978–1983) Also Member of theNorthern Ireland Forum,Northern Ireland Assembly,Northern Ireland Assembly (1982) and theDáil Éireann |
| Irene Adams | | Labour | 1990 | Paisley North (1990–2005) | Later ennobled Baroness Adams of Craigielea |
| James Adams | | Independent | 1801 | Bramber (1801–1802) Harwich (1803–1806, 1807) | Also a Member of theParliament of Great Britain |
| Richard Adams | | Labour | 1945 | Balham and Tooting (1945–1950) Wandsworth Central (1950–1955) | Lord Commissioner of the Treasury (1949–1951) |
| Vyvyan Adams |  | Conservative | 1931 | Leeds West (1931–1945) | |
| William Adams | | Independent | 1801 | Plympton Erle (1801–1801) | Died in office Also a Member of theParliament of Great Britain |
| Tory | Totnes (1801–1811) |
| William Thomas Adams | | Labour Co-operative | 1945 | Hammersmith South (1945–1949) | Died in office |
| Jennie Adamson |  | Labour | 1938 | Dartford (1938–1945) Bexley (1945–1946) | Parliamentary Secretary to the Minister for Pensions (1945–1946) Chair of theLabour Party (1935–1936) |
| William Adamson |  | Labour | 1910 | West Fife (1910–1931) | Secretary for Scotland (1924, 1929–1931) Leader of the Labour Party (1917–1921) Treasurer of theScottish Miners' Federation (1914–1922) General Secretary of theFife and Kinross Miners' Association (1908–1917) |
| William Murdoch Adamson | | Labour | 1922 | Cannock (1922–1931,1935–1945) | Lord Commissioner of the Treasury (1941–1944) |
| Henry Addington 1st Viscount Sidmouth |  | Tory | 1801 | Devizes (1801–1805) | Home Secretary (1812–1822) Lord Privy Seal (1806) Prime Minister of the United Kingdom (1801–1804) First Lord of the Treasury (1801–1804) Chancellor of the Exchequer (1801–1804) Leader of the House of Commons (1801) Lord President of the Council (1805, 1806–1807, 1812) Speaker of the House of Commons (1789–1801) Also Member of theParliament of Great Britain Later ennobled asViscount Sidmouth |
| John Hiley Addington | | Tory | 1801 | Wendover (1801–1802) Bossiney (1802–1803) Harwich (1803–1818) | Under-Secretary of State for Home Affairs (1812–1818) Paymaster of the Forces (1803–1804) Secretary to the Treasury (1801–1802) Also Member of theParliament of Great Britain |
| William Addington 3rd Viscount Sidmouth | | Tory | 1863 | Devizes (1863–1864) | Later ennobled asViscount Sidmouth |
| Christopher Addison 1st Viscount Addison |  | Liberal | 1910 | Hoxton (1910–1918) | Lord President of the Council (1951) Paymaster General (1948–1949) Lord Privy Seal (1947–1951) Leader of the House of Lords (1945–1951) Dominion Affairs Secretary (1945–1947) Minister of Agriculture (1930–1931) Minister without portfolio (1921) Later ennobled asBaron Addison andViscount Addison |
| Coalition Liberal | Shoreditch (1918–1922) |
| Labour | Swindon (1929–1931,1934–1935) |
| Henry John Adeane | | Whig | 1830 | Cambridgeshire (1830–1832) | |
| SirRyland Adkins |  | Liberal | 1906 | Middleton (1906–1918) Middleton and Prestwich (1918–1923) | |
| Robert Adley | | Conservative | 1970 | Bristol North East (1970–1974) Christchurch and Lymington (1974–1983) Christchurch (1983–1993) | Chair of theTransport Select Committee (1992–1993) |
| Bim Afolami |  | Conservative | 2017 | Hitchin and Harpenden (2017–2024) | |
| Adam Afriyie |  | Conservative | 2005 | Windsor (2005–2024) | |
| SirEmanuel Felix Agar | | Tory | 1807 | Sudbury (1807–1812) | |
| George Agar-Ellis |  | Independent | 1818 | Heytesbury (1818–1820) | First Commissioner of Woods and Forests (1830–1831) Later ennobled asBaron Dover |
| Whig | Seaford (1820–1826) Ludgershall (1826–1830)Okehampton (1830–1831) |
| Thomas Agar-Robartes |  | Whig | 1847 | Cornwall East (1847–1859) | Later ennobled asBaron Robartes |
| Liberal | Cornwall East (1859–1868) |
| Thomas Agar-Robartes, 6thViscount Clifden |  | Liberal | 1880 | Cornwall East (1880–1882) | Lord-Lieutenant of Cambridgeshire (1906–1915) Later ennobled asBaron Robartes andViscount Clifden |
| Thomas Agar-Robartes |  | Liberal | 1906 | Bodmin (1906–1906) St Austell (1908–1915) | Died in office |
| SirJames Agg-Gardner | | Conservative | 1874 | Cheltenham (1874–1880, 1885–1895,1900–1906,1911–1928) | Died in office |
| SirAndrew Agnew 7th Baronet of Lochnaw | | Whig | 1830 | Wigtownshire (1830–1837) | |
| SirAndrew Agnew 8th Baronet of Lochnaw | | Whig | 1856 | Wigtownshire (1856–1868) | |
| Liberal | Wigtownshire (1859–1868) |
| SirAndrew Agnew 9th Baronet of Lochnaw | | Liberal Unionist | 1900 | Edinburgh South (1900–1906) | |
| SirGeorge Agnew 2nd Baronet of Great Stanhope Street |  | Liberal | 1906 | Salford West (1906–1918) | |
| SirPeter Agnew 1st Baronet of Clendry | | Conservative | 1931 | Camborne (1931–1950) South Worcestershire (1955–1966) | |
| SirWilliam Agnew 1st Baronet of Great Stanhope Street |  | Liberal | 1880 | South East Lancashire (1880–1885) Stretford (1885–1886) | |
| Imran Ahmad Khan |  | Conservative | 2019 | Wakefield (2019–2022) | |
| Zubir Ahmed | | Labour | 2024 | Glasgow South West (2024–present) | |
| Tasmina Ahmed-Sheikh |  | SNP | 2015 | Ochil and South Perthshire (2015–2017) | SNP Spokesperson forInternational Trade (2015–2017) |
| Nick Ainger | | Labour | 1992 | Pembrokeshire (1992–1997) Carmarthen West and South Pembrokeshire (1997–2010) | Lord Commissioner of the Treasury (2001–2005) |
| SirRobert Ainslie 1st Baronet of Great Torrington | | Independent | 1801 | Milborne Port (1801–1802) | British Ambassador to the Ottoman Empire (1775–1793) Also Member of theParliament of Great Britain |
| Robert Sharpe Ainslie | | Independent | 1802 | Mitchell (1802–1806) | |
| William Ainsley | | Labour | 1955 | North West Durham (1955–1964) | |
| Bob Ainsworth |  | Labour | 1992 | Coventry North East (1992–2015) | Shadow Defence Secretary (2010) Defence Secretary (2009–2010) Minister for the Armed Forces (2007–2009) Government Deputy Chief Whip (2003–2007) Lord Commissioner of the Treasury (1997–2001) |
| Peter Ainsworth | | Conservative | 1992 | East Surrey (1992–2010) | Shadow Environment Secretary (2001–2002, 2005–2009) Shadow Culture, Media and Sport Secretary (1998–2001) |
| Peter Ainsworth | | Whig | 1835 | Bolton (1835–1847) | |
| SirJohn Aird 1st Baronet of London |  | Conservative | 1887 | Paddington North (1887–1906) | Mayor ofPaddington (1900–02) |
| Craigie Aitchison | | Labour | 1929 | Kilmarnock (1929–1931) | Lord Justice Clerk (1933–1941) Lord Advocate (1929–1933) |
| National Labour | Kilmarnock (1931–1933) |
| Jonathan Aitken | | Conservative | 1974 | Thanet East (1974–1983) South Thanet (1983–1997) | Chief Secretary to the Treasury (1994–1995) Minister for Defence Procurement (1992–1994) |
| SirMax Aitken 1st Baronet of Cherkley |  | Conservative | 1910 | Ashton-under-Lyne (1910–1916) | Lord Privy Seal (1943–1945) Minister of War Production (1942) Minister of Supply (1941–1942) Minister of Aircraft Production (1940–1941) Chancellor of the Duchy of Lancaster (1918) Minister of Information (1918) Later ennobled asBaron Beaverbrook |
| SirMax Aitken 2nd Baronet of Cherkley | | Conservative | 1945 | Holborn (1945–1950) | Later ennobled asBaron Beaverbrook |
| Nickie Aiken |  | Conservative | 2019 | Cities of London and Westminster (2019–2024) | Leader ofWestminster City Council (2017–2020) |
| SirWilliam Aitken | | Conservative | 1950 | Bury St Edmunds (1950–1964) | |
| Luke Akehurst | | Labour | 2024 | North Durham (2024–present) | |
| Aretas Akers-Douglas 1st Viscount Chilston |  | Conservative | 1880 | East Kent (1880–1885) St Augustine's (1885–1911) | Home Secretary (1902–1905) First Commissioner of Works (1895–1902) Parliamentary Secretary to the Treasury (1885–1886, 1886–1892) Later ennobled asViscount Chilston |
| Sadik Al-Hassan | | Labour | 2024 | North Somerset (2024–present) | |
| Bayo Alaba | | Labour | 2024 | Southend East and Rochford (2024–present) | |
| SirIrving Albery | | Conservative | 1924 | Gravesend (1924–1945) | |
| Austen Albu | | Labour | 1948 | Edmonton (1948–1974) | Minister for Economic Affairs (1965–1967) Chairman of theFabian Society (1953–1954) |
| Thomas Alcock | | Independent | 1826 | Newton (1826–1830) | High Sheriff of Surrey (1837) |
| Whig | Ludlow (1839–1840) East Surrey (1847–1859) |
| Liberal | East Surrey (1859–1865) |
| William Congreve Alcock | | Tory | 1801 | Waterford City (1801–1803) | Also Member of theParliament of Ireland |
| SirPercy Alden |  | Liberal | 1906 | Tottenham (1906–1918) | |
| Labour | Tottenham South (1923–1924) |
| Peter Aldous |  | Conservative | 2010 | Waveney (2010–2024) | |
| John Aldridge | | Conservative | 1868 | Horsham (1868–1869) | |
| A. V. Alexander |  | Labour Co-operative | 1922 | Sheffield Hillsborough (1922–1931, 1935–1950) | Leader of theLabour Party in theHouse of Lords (1955–1964) Chancellor of the Duchy of Lancaster (1950–1951) Minister of Defence (1946–1950) Minister without Portfolio (1946) First Lord of the Admiralty (1929–1931, 1940–1945, 1945–1946) Later ennobled asViscount Alexander of Hillsborough andEarl Alexander of Hillsborough |
| Boyd Alexander | | Independent | 1803 | Clyde Burghs (1803–1806) | |
| SirClaud Alexander 1st Baronet of Ballochmyle | | Conservative | 1874 | Ayrshire South (1874–1885) | |
| SirDanny Alexander |  | Liberal Democrat | 2005 | Inverness, Nairn, Badenoch and Strathspey (2005–2015) | Chief Secretary to the Treasury (2010–2015) Secretary of State for Scotland (2010) |
| Douglas Alexander |  | Labour | 1997 | Paisley South (1997–2005) Paisley and Renfrewshire South (2005–2015) Lothian East (2024–present) | Shadow Foreign Secretary (2011–2015) Shadow Work and Pensions Secretary (2010–2011) Shadow International Development Secretary (2010) International Development Secretary (2007–2010) Secretary of State for Scotland (2006–2007) Transport Secretary (2006–2007) Minister for Europe (2005–2006) Minister for Trade (2004–2005) Chancellor of the Duchy of Lancaster (2003–2004) |
| Heidi Alexander |  | Labour | 2010 | Lewisham East (2010–2018) Swindon South (2024–present) | Deputy Mayor of London for Transport (2018–2021) Shadow Health Secretary (2015–2016) |
| Henry Alexander | | Tory | 1801 | Londonderry City (1801–1802) Old Sarum (1802–1806) | Also Member of theParliament of Ireland |
| Henry Alexander | | Tory | 1826 | Barnstaple (1826–1830) | |
| James Alexander | | Tory | 1812 | Old Sarum (1812–1832) | |
| James Alexander 2nd Viscount Alexander | | Conservative | 1837 | Tyrone (1837–1839) | High Sheriff of Armagh (1836) Later ennobled asEarl of Caledon |
| Josias Alexander | | Tory | 1820 | Old Sarum (1820–1828,1830–1832) | |
| Maurice Alexander |  | National Liberal | 1922 | Southwark South East (1922–1923) | |
| Richard Alexander | | Conservative | 1979 | Newark (1979–1997) | |
| SirWilliam Alexander |  | Scottish Unionist | 1923 | Glasgow Central (1923–1945) | |
| Rushanara Ali |  | Labour | 2010 | Bethnal Green and Bow (2010–2024) Bethnal Green and Stepney (2024–present) | Shadow Further Education Minister (2013–14) Shadow International Development Minister (2010–13) |
| Tahir Ali |  | Labour | 2019 | Birmingham Hall Green (2019–present) | |
| Michael Alison | | Conservative | 1964 | Barkston Ash (1964–1983) Selby (1983–1997) | Second Church Estates Commissioner (1987–1997) Minister for Employment (1981–1983)Minister for Northern Ireland (1979–1981) |
| SirAlexander Allan 1st Baronet of Kingsgate | | Tory | 1803 | Berwick-upon-Tweed (1803–1806,1807–1820) | Director of the East India Company (1814–1817, 1819–1820) |
| George Allan | | Tory | 1813 | Durham (1813–1818) | |
| Richard Allan |  | Liberal Democrats | 1997 | Sheffield Hallam (1997–2005) | Later ennobled as Baron Allan of Hallam |
| Lucy Allan |  | Conservative | 2015 | Telford (2015–2024) | |
| Robert Allan | | Conservative | 1951 | Paddington South (1951–1966) | Financial Secretary to the Admiralty (1958–1959) Parliamentary Private Secretary to the Prime Minister (1955–1956) |
| Alexander Allardyce | | Independent | 1801 | Aberdeen Burghs (1801–1802) | Also Member ofParliament of Great Britain |
| James Allason | | Conservative | 1959 | Hemel Hempstead (1959–1974) | |
| Rupert Allason | | Conservative | 1987 | Torbay (1987–1997) | |
| Frank Allaun | | Labour | 1955 | Salford East (1955–1983) | Chair of The Labour Party (1978–1979) |
| Walter Alldritt | | Labour | 1964 | Liverpool Scotland (1964–1971) | Regional Secretary of theNational Union of General and Municipal Workers (1970–1981) |
| Arthur Allen | | Labour | 1945 | Bosworth (1945–1959) | Opposition Whip (1951) |
| Charles Allen |  | Liberal | 1900 | Stroud (1900–1918) | |
| Charles Allen |  | Liberal | 1892 | Pembroke and Haverfordwest (1892–1895) | |
| Henry George Allen | | Liberal | 1880 | Pembroke (1880–1885) Pembroke and Haverfordwest (1885–1886) | |
| John Hensleigh Allen | | Whig | 1818 | Pembroke (1818–1826) | High Sheriff of Pembrokeshire (1808–1809) |
| SirJohn Sandeman Allen |  | Conservative | 1924 | Liverpool West Derby (1924–1935) | Died in office |
| John Sandeman Allen | | Conservative | 1931 | Birkenhead West (1931–1945) | |
| Graham Allen | | Labour | 1987 | Nottingham North (1987–2017) | Chair ofPolitical and Constitutional Reform Committee (2010–2015) Vice-Chamberlain of the Household (1998–2001) Lord Commissioner of the Treasury (1997–1998) |
| Heidi Allen |  | Conservative | 2015 | South Cambridgeshire (2015–2019) | ActingLeader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Change UK | South Cambridgeshire (2019) |
| Independent |
| The Independents |
| Liberal Democrats |
| Henry George Allen | | Liberal | 1880 | Pembroke (1880–1885) Pembroke and Haverfordwest (1885–1886) | |
| SirRonald Wilberforce Allen | | Liberal | 1923 | Leicester South (1923–1924) | |
| Scholefield Allen | | Labour | 1945 | Crewe (1945–1974) | Recorder ofBlackburn (1947–1970) |
| W. E. D. Allen | | Ulster Unionist | 1929 | Belfast West (1929–1931) | |
| New Party | Belfast West (1931) |
| SirWilliam Allen |  | Irish Unionist | 1917 | North Armagh (1917–1921) | Sovereign Grand Master of theRoyal Black Preceptory (1924–1947) |
| Ulster Unionist | North Armagh (1917–1922) Armagh (1922–1947) |
| Garry Allighan | | Labour | 1945 | Gravesend (1945–1947) | |
| Augustus Allhusen | | Conservative | 1897 | Salisbury (1897–1900) Hackney Central (1900–1906) | High Sheriff of Buckinghamshire (1913) |
| Rosena Allin-Khan |  | Labour | 2016 | Tooting (2016–present) | Shadow Secretary of State for Mental Health (2020–present) Shadow Minister for Sport (2016–2020) |
| Jim Allister |  | TUV | 2024 | North Antrim (2024–present) | Leader ofTraditional Unionist Voice (2007–present) |
| John Peter Allix | | Conservative | 1841 | Cambridgeshire (1841–1847) | |
| Lewis Allsopp | | Tory | 1819 | Camelford (1819) | Solicitor to Duchy of Cornwall (1822–1835) |
| Alfred Percy Allsopp | | Conservative | 1887 | Taunton (1887–1895) | Mayor of Worcester (1892–1893, 1894–1895, 1909–1910) |
| George Allsopp |  | Conservative | 1885 | Worcester (1885–1906) | |
| SirHenry Allsopp 1st Baronet of Hindlip Hall | | Conservative | 1874 | East Worcestershire (1874–1880) | Later ennobled asBaron Hindlip |
| Samuel Allsopp 2nd Baronet of Hindlip Hall |  | Conservative | 1873 | East Staffordshire (1873–1880) Taunton (1882–1887) | Later ennobled asBaron Hindlip |
| Joseph Alpass | | Labour | 1929 | Bristol Central (1929–1931) Thornbury (1945–1950) | |
| Cuthbert Alport | | Conservative | 1950 | Colchester (1950–1961) | High Steward of Colchester (1967) BritishHigh Commissioner to theFederation of Rhodesia and Nyasaland (1961–1963) Minister of State for the Commonwealth Relations Office (1959–1961) Parliamentary Under-Secretary of State for Commonwealth Relations (1957–1959) Assistant Postmaster-General (1955–1957) Later ennobled asBaron Alport |
| Richard Alsager | | Conservative | 1835 | East Surrey (1835–1841) | Died in office |
| Robert Alstead |  | Liberal | 1923 | Altrincham (1923–1924) | Mayor of Wigan (1926–1927) |
| David Alton |  | Liberal | 1979 | Liverpool Mossley Hill (1983–1988) Liverpool Edge Hill (1979–1983) | Liberal Chief Whip (1985–1987) Later ennobled asBaron Alton |
| Liberal Democrats | Liverpool Mossley Hill (1988–1997) |
| Daniel Ambrose | | Irish National Federation | 1892 | South Louth (1892–1896) | Died in office |
| Robert Ambrose | | Irish National Federation | 1893 | West Mayo (1893–1910) | |
| Irish Parliamentary Party | West Mayo (1900–1910) |
| SirWilliam Amcotts-Ingilby 2nd Baronet ofKettlethorpe Hall andRipley Castle | | Independent | 1807 | East Retford (1807–1812) Lincolnshire (1823–1832) North Lincolnshire (1832–1835) | High Sheriff of Yorkshire (1821) |
| Julian Amery |  | Conservative | 1950 | Preston North (1950–1966) Brighton Pavilion (1969–1992) | Minister of State for Foreign and Commonwealth Affairs (1972–1974) Minister for Housing and Construction (1970–1972) Minister of Public Buildings and Works (1970) Minister of Aviation (1962–1964) Secretary of State for Air (1960–1962) Under-Secretary of State for the Colonies (1958–1960) Later ennobled asBaron Amery of Lustleigh |
| Leo Amery |  | Liberal Unionist | 1911 | Birmingham South (1911–1912) | Secretary of State for India and Burma (1940–1945) Secretary of State for Dominion Affairs (1925–1929) Secretary of State for the Colonies (1924–1929) First Lord of the Admiralty (1922–1924) Under-Secretary of State for the Colonies (1919–1921) |
| Unionist | Birmingham South (1912–1918) |
| Conservative | Birmingham Sparkbrook (1918–1945) |
| Mike Amesbury |  | Labour | 2017 | Weaver Vale (2017–2024) Runcorn and Helsby (2024–2025) | Shadow Minister for Housing and Planning (2020–present) Shadow Minister for Employment (2018–2020) |
| SirDavid Amess |  | Conservative | 1983 | Basildon (1983–1997) Southend West (1997–2021) | Killed in office |
| William Amherst 3rd Earl Amherst |  | Conservative | 1859 | West Kent (1859–1868) Mid Kent (1868–1880) | Pro Grand Master of the United Grand Lodge of England (1898–1908) Chairman of theNational Union of Conservative and Constitutional Associations (1968)Later ennobled asBaron Amherst andEarl Amherst (Viscount Holmesdale) |
| William Pitt Amherst 2nd Earl Amherst | | Ultra-Tories | 1829 | East Grinstead (1829–1832) | Later ennobled asEarl Amherst (Viscount Holmesdale) andBaron Amherst |
| Charles Ammon |  | Labour | 1922 | Camberwell North (1922–1931,1935–1944) | Mayor of Camberwell (1950–1951) Captain of the Gentlemen-at-Arms (Government Chief Whip in the House of Lords) (1945–1949) Chairman of the London County Council (1941–1942) Parliamentary and Financial Secretary to the Admiralty (1924, 1929–1931) General Secretary of theNational Union of Docks, Wharves and Shipping Staffs (1918–1919) Chair of theFawcett Association (1911–1919) Later ennobled asBaron Ammon |
| Alan Amos | | Conservative | 1987 | Hexham (1987–1992) | Mayor ofWorcester (2014–2015) |
| Gideon Amos | | Liberal Democrats | 2024 | Taunton and Wellington (2024–present) | |
| James Amyatt | | Tory | 1801 | Southampton (1801–1806) | Also Member ofParliament of Great Britain |
| Michael Ancram |  | Conservative | 1974 | Berwick and East Lothian (1974) Edinburgh South (1979–1987) Devizes (1992–2010) | Shadow Secretary of State for Defence (2005) Shadow Secretary of State for Foreign and Commonwealth Affairs (2001–2005) Deputy Leader of the Conservative Party (2001–2005) Chair of the Conservative Party (1998–2001) Shadow Constitutional Affairs Spokesperson (1997–1998) Later ennobled asMarquess of Lothian |
| Alexander Anderson | | Labour | 1945 | Motherwell (1945–1954) | |
| SirAlan Anderson | | Conservative | 1935 | City of London (1935–1940) | High Sheriff of the County of London (1922–1923) Controller of the Navy (1917–1918) |
| Callum Anderson | | Labour | 2024 | Buckingham and Bletchley (2024–present) | |
| David Anderson | | Conservative | 1963 | Dumfriesshire (1963–1964) | Solicitor General for Scotland (1960–1964) |
| David Anderson |  | Labour | 2005 | Blaydon (2005–2017) | Shadow Secretary of State for Northern Ireland (2016–2017) Shadow Secretary of State for Scotland (2016–2017) |
| Donald Anderson |  | Labour | 1966 | Monmouth (1966–1970) Swansea East (1974–2005) | Chair of theForeign Affairs Select Committee (1997–2005) Later ennobled asBaron Anderson of Swansea |
| Fleur Anderson |  | Labour | 2019 | Putney (2019–present) | Shadow Parliamentary Secretary to the Cabinet Office (2021–present) |
| Frank Anderson | | Labour | 1935 | Whitehaven (1935–1959) | |
| George Knox Anderson | | Conservative | 1918 | Canterbury (1918–1918) | |
| Hugh Alfred Anderson | | Irish Unionist | 1918 | North Londonderry (1918–1919) | High Sheriff of County Londonderry (1919) |
| Janet Anderson | | Labour | 1992 | Rossendale and Darwen (1992–2010) | Parliamentary Under-Secretary of State for Film, Tourism and Broadcasting (1998–2001) Vice-Chamberlain of the Household (1997–1998) Shadow Minister for Women (1996–1997) |
| SirJohn Anderson 1st Baronet of Mill Hill | | Tory | 1801 | London (1801–1806) | Also Member ofParliament of Great Britain |
| John Anderson 1st Viscount Waverly |  | National | 1938 | Combined Scottish Universities (1938–1950) | Chancellor of the Exchequer (1943–1945) Lord President of the Council (1940–1943) Minister of Home Security (1939–1940) Home Secretary (1939–1940) Governor of Bengal (1932–1937) Permanent Under-Secretary for theHome Department (1922–1932) Joint Permanent Under-Secretary to theLord Lieutenant of Ireland (1920–1922) Later ennobled asViscount Waverley |
| Lee Anderson |  | Conservative | 2019 | Ashfield (2019–2024) | |
| Reform UK | Ashfield (2024–present) |
| Stuart Anderson |  | Conservative | 2019 | Wolverhampton South West (2019–2024) South Shropshire (2024–present) | |
| William Crawford Anderson | | Labour | 1914 | Sheffield Attercliffe (1914–1918) | Chair of the Labour Party (1914–1916) Chairman of the Independent Labour Party (1911–1913) |
| Charles Anderson-Pelham 2nd Earl of Yarborough | | Whig | 1830 | Newtown (1830–1831) Lincolnshire (1831–1832) North Lincolnshire (1832–1847) | Lord Lieutenant of Lincolnshire (1857–1862) Vice-Admiral of Lincolnshire (1853–1862) Later ennobled asEarl of Yarborough |
| Charles Anderson-Pelham 3rd Earl of Yarborough |  | Whig | 1857 | Great Grimsby (1857–1859) | Later ennobled asEarl of Yarborough |
| Liberal | Great Grimsby (1859–1862) |
| George Anderson-Pelham | | Whig | 1806 | Great Grimsby (1806–1807) Newtown (Isle of Wight) (1808–1820) | High Steward of Grimsby (1815) |
| Stuart Andrew |  | Conservative | 2010 | Pudsey (2010–2024) Daventry (2024–present) | Deputy Chief Whip of the House of Commons (2020–2022) Treasurer of the Household (2020–2022) Vice-Chamberlain of the Household (2019–20) Parliamentary Under-Secretary of State for Defence Procurement (2018–19) Parliamentary Under-Secretary of State for Wales (2018) |
| Miles Peter Andrews |  | Tory | 1801 | Bewdley (1801–1814) | Also Member ofParliament of Great Britain |
| SirNorman Angell |  | Labour | 1929 | Bradford North (1929–1931) | |
| John Angerstein | | Whig | 1801 | Camelford (1801–1802) Greenwich (1835–1837) | High Sheriff of Norfolk (1831–1832) Also Member ofParliament of Great Britain |
| William Angerstein | | Liberal | 1859 | Greenwich (1859–1865) | |
| James Annand |  | Liberal | 1906 | East Aberdeenshire (1906–1906) | |
| Arthur Annesley 11th Viscount Valentia |  | Conservative | 1895 | Oxford (1895–1917) | Comptroller of the Household (1898–1905) Later ennobled asViscount Valentia andBaron Annesley of Bletchington |
| Francis Annesley |  | Tory | 1801 | Reading (1801–1806) | Also Member ofParliament of Great Britain |
| George Annesley 2nd Earl of Mountnorris 9th Viscount Valentia | | Independent | 1808 | Yarmouth (1808–1810) | Later ennobled asViscount Valentia andEarl of Mountnorris |
| George Annesley | | Tory | 1830 | County Wexford (1830–1831) | Later ennobled asViscount Valentia[1] |
| Hugh Annesley 5th Earl Annesley | | Tory | 1857 | County Cavan (1857–1874) | Representative Peer of Ireland (1877–1908) Later ennobled asEarl Annesley |
| William Annesley 3rd Earl Annesley | | Tory | 1815 | Downpatrick (1815–1820) | High Sheriff of Down (1822) Later ennobled asEarl Annesley andViscount Glerawly |
| William Annesley 4th Earl Annesley | | Conservative | 1852 | Great Grimsby (1852–1857) | Representative Peer for Ireland (1867–1874) Later ennobled asEarl Annesley andViscount Glerawly |
| Caroline Ansell |  | Conservative | 2015 | Eastbourne (2015–2017,2019–2024) | |
| Augustus Anson |  | Liberal | 1859 | Lichfield (1859–1868) Bewdley (1869–1874) | |
| George Anson |  | Whig | 1818 | Great Yarmouth (1818–1835) Stoke-upon-Trent (1836–1837) Staffordshire South (1837–1853) | Commander-in-Chief of the British Indian Army (1856) Commander-in-Chief of the Madras Army (1854–1856) Clerk of the Ordnance (1841, 1846–1852) Storekeeper of the Ordnance (1835–1841) |
| SirGeorge Anson |  | Whig | 1806 | Lichfield (1806–1841) | Governor of the Royal Hospital Chelsea (1849) Colonel of the4th Royal Irish Dragoon Guards (1829–1849) |
| Thomas Anson 1st Earl of Litchfield |  | Whig | 1818 | Great Yarmouth (1818–1819) | Postmaster General (1835–1841) Master of the Buckhounds (1830–1834) Later ennobled asEarl of Lichfield andViscount Anson |
| Thomas Anson 2nd Earl of Litchfield | | Whig | 1847 | Lichfield (1847–1854) | Lord-Lieutenant of Staffordshire (1863–1871) Later ennobled asEarl of Lichfield |
| Thomas Anson 1st Viscount Anson |  | Whig | 1801 | Lichfield (1801–1806) | Also Member ofParliament of Great Britain Later ennobled asViscount Anson andBaron Soberton |
| SirWilliam Anson 3rd Baronet of Hatch Beauchamp |  | Liberal Unionist | 1899 | Oxford University (1899–1914) | Parliamentary Secretary to the Board of Education (1902–1905) Vice-Chancellor of Oxford University (1898–1899) Warden of All Souls College, Oxford (1881–1914) |
| Conservative | Oxford University (1912–1914) |
| Henry Torrens Anstruther |  | Liberal Unionist | 1886 | St Andrews Burghs (1886–1903) | |
| SirJohn Anstruther 1st Baronet of Elie 4th Baronet of Anstruther |  | Independent | 1806 | Anstruther Burghs (1806–1811) | Also Member ofParliament of Great Britain |
| SirRobert Anstruther 5th Baronet of Wrae, Balcaskie & Braemore | | Liberal | 1864 | Fife (1864–1880) | Lord Lieutenant of Fife (1864–1886) |
| Independent Liberal | St Andrews Burghs (1885–1886) |
| Liberal Unionist | St Andrews Burghs (1886–1886) |
| William Anstruther-Gray | | Liberal Unionist | 1906 | St Andrews Burghs (1906–1910, 1910–1918) | |
| William Anstruther-Gray 1st Baronet of Kilmany |  | Unionist | 1931 | North Lanarkshire (1931–1945) Berwick and East Lothian (1951–1966) | Lord Lieutenant of Fife (1975–1980) Chairman of the1922 Committee (1964–1966) Chairman of Ways and Means (1962–1964) Deputy Speaker of the House of Commons (1962–1964) Assistant Postmaster-General (1945) Later ennobled asBaron Kilmany |
| Tonia Antoniazzi |  | Labour | 2017 | Gower (2017–present) | Shadow Minister for Northern Ireland (2021–present) |
| SirEdmund Antrobus 3rd Baronet of Antrobus Hall | | Conservative | 1841 | East Surrey (1841–1847) | |
| Peelite | Wilton (1855–1859) |
| Liberal | Wilton (1859–1877) |
| Gibbs Antrobus | | Tory | 1820 | Aldborough (1820–1826) Plympton Erle (1826–1832) | Sheriff of Cheshire (1934–1935) |
| Reginald Applin |  | Conservative | 1924 | Enfield (1924–1929,1931–1935) | |
| Steffan Aquarone |  | Liberal Democrats | 2024 | North Norfolk (2024–present) | |
| Charles Arbuthnot |  | Tory | 1809 | Eye (1809–1812) Orford (1812–1818) St Germans (1818–1827) St Ives (1828–1830) Ashburton (1830–1831) | Chancellor of the Duchy of Lancaster (1828–1830) First Commissioner of Woods and Forests (1823–1827, 1828) Joint Secretary to the Treasury (1809–1823) Ambassador to the Ottoman Empire (1804–07) Under-Secretary of State for Foreign Affairs (1803–1804) Ambassador to Sweden (1802–1804) Also Member ofParliament of Great Britain |
| Charles George James Arbuthnot | | Tory | 1831 | Tregony (1831–1832) | Colonel of the72nd Regiment of Foot (1870) Colonel of the91st Regiment of Foot (1864–1870) Colonel of the89th Regiment of Foot (1857–1864) Page of Honour (1812–17) |
| Gerald Arbuthnot |  | Conservative | 1910 | Burnley (1910–1910) | |
| SirHugh Arbuthnott |  | Tory | 1826 | Kincardineshire (1826–1835) | Colonel of the79th Regiment of Foot (1862–1868) Colonel of the38th Regiment of Foot (1843–1862) |
| Conservative | Kincardineshire (1935–1865) |
| James Arbuthnot |  | Conservative | 1987 | Wanstead and Woodford (1987–1997) North East Hampshire (1997–2015) | Chairman of theDefence Select Committee (2005–2014) Shadow Secretary of State for Trade (2003–2005) Opposition Chief Whip of theHouse of Commons (1997–2001) Minister of State for Defence Procurement (1995–1997) Parliamentary Under-Secretary of State forSocial Security (1994–1995) Later ennobled asBaron Arbuthnot of Edrom |
| SirJohn Arbuthnot 1st Baronet ofKittybrewster | | Conservative | 1950 | Dover (1950–1964) | |
| Andrew Arcedeckne | | Independent | 1826 | Dunwich (1826–1831) | High Sheriff of Suffolk (1819–20) |
| Joseph Arch |  | Liberal | 1885 | North West Norfolk (1885–1886,1892–1900) | President of theNational Agricultural Labourers' Union (1872–?) |
| SirEdward Archdale 1st Baronet of Riversdale |  | Irish Unionist | 1898 | North Fermanagh (1898–1903,1916–1921) | Grand Master of theOrange Institution of Ireland (1926–1941) Minister of Agriculture of Northern Ireland (1921–1933) Minister of Commerce of Northern Ireland (1921–1925) Lord Lieutenant of Tyrone (1913–16) Also a Member ofParliament of Northern Ireland |
| Ulster Unionist | North Fermanagh (1921–1922) |
| Mervyn Edward Archdale | | Tory | 1834 | Fermanagh (1834–1834) | High Sheriff of Fermanagh (1879) |
| Conservative | Fermanagh (1834–1874) |
| William Humphrys Archdale | | Conservative | 1874 | Fermanagh (1874–1885) | High Sheriff of Tyrone (1861) High Sheriff of Fermanagh (1835) |
| Mervyn Archdall | | Tory | 1801 | Fermanagh (1801–1802) | High Sheriff of Fermanagh (1773–1774) Governor of Fermanagh (1756) Also a Member ofParliament of Ireland |
| Mervyn Archdall | | Tory | 1802 | Fermanagh (1802–1834) | Lieutenant-Governor of the Isle of Wight (1915–1938) Grand Master of theOrange Order (1818–1822) Governor of County Fermanagh (1813–1831) |
| Richard Archdall | | Independent | 1802 | Kilkenny City (1802–1802) | Also Member ofIrish House of Commons |
| Tory | Dundalk (1802–1806) |
| Jeffrey Archer |  | Conservative | 1969 | Louth (1969–1974) | Later ennobled asBaron Archer of Weston-super-Mare |
| Peter Archer | | Labour | 1966 | Rowley Regis and Tipton (1966–1974) Warley West (1974–1992) | President of theFabian Society (1993–2012) Shadow Secretary of State for Northern Ireland (1983–1987) Shadow Secretary of State for Trade (1982–1983) Shadow Attorney General (1981–1982) Chairman of theFabian Society (1979–1980) Solicitor General for England and Wales (1974–1979) Later ennobled asBaron Archer of Sandwell |
| John Archer-Houblon | | Independent | 1810 | Essex (1810–1820) | High Sheriff of Essex (1801–1802) |
| SirMartin Archer-Shee | | Conservative | 1910 | Finsbury Central (1910–1918) Finsbury (1918–1923) | |
| SirRichard Pepper Arden |  | Whig | 1801 | Bath (1801) | Chief Justice of the Common Pleas (1801–1804) Master of the Rolls (1788–1801) Attorney General for England and Wales (1784–1788) Later ennobled asBaron Alvanley |
| Edward Argar |  | Conservative | 2015 | Charnwood (2015–2024) Melton and Syston (2024–present) | |
| Richard Arkless | | SNP | 2015 | Dumfries and Galloway (2015–2017) | |
| Augustus Arkwright | | Conservative | 1868 | North Derbyshire (1868–1880) | |
| Francis Arkwright | | Conservative | 1874 | East Derbyshire (1874–1880) | |
| Richard Arkwright | | Tory | 1813 | Rye (1813–1818, 1826–1830) | |
| Benjamin Armitage |  | Liberal | 1813 | Salford (1880–1885) Salford West (1885–1886) | |
| Robert Armitage |  | Liberal | 1906 | Leeds Central (1906–1922) | Lord Mayor of Leeds (1904–1905) |
| ColonelC. W. Armstrong | | UUP | 1954 | Armagh (1954–1959) | |
| Ernest Armstrong | | Labour | 1964 | North West Durham (1964–1987) | |
| Henry Bruce Wright Armstrong | | UUP | 1921 | Mid Armagh (1921–1922) | Lord Lieutenant of Armagh (1924–1939) |
| Hilary Armstrong |  | Labour | 1987 | North West Durham (1987–2010) | Later ennobled as Baroness Armstrong of Hill Top |
| SirAlfred Arnold |  | Conservative | 1895 | Halifax (1895–1900) | |
| Jacques Arnold | | Conservative | 1987 | Gravesham (1987–1997) | |
| SirTom Arnold | | Conservative | 1974 | Hazel Grove (1974–1997) | |
| Hugh Oakeley Arnold-Forster |  | Liberal Unionist | 1892 | Belfast West (1892–1906) Croydon (1906–1909) | Secretary of State for War (1903–1905) |
| SirWilliam Arrol |  | Liberal Unionist | 1895 | South Ayrshire (1895–1906) | |
| Scott Arthur | | Labour | 2024 | Edinburgh South West (2024–present) | |
| Paddy Ashdown |  | Liberal | 1983 | Yeovil (1983–1988) | Leader of the Liberal Democrats (1988–1999) High Representative for Bosnia and Herzegovina (2002–2006) Later ennobled as Baron Ashdown of Norton-sub-Hamdon |
| Liberal Democrats | Yeovil (1988–2001) |
| H. H. Asquith |  | Liberal | 1886 | East Fife (1886–1918) Paisley (1920–1924) | Prime Minister of the United Kingdom (1908–1916) Chancellor of the Exchequer (1905–1908) Home Secretary (1892–1895) Secretary of State for War (1914) Leader of the Liberal Party (1908–1926) Later ennobled asEarl of Oxford and Asquith |
| Clement Attlee |  | Labour | 1922 | Limehouse (1922–1950) Walthamstow West (1950–1955) | Prime Minister of the United Kingdom (1945–1951) Deputy Prime Minister of the United Kingdom (1942–1945) Leader of the Labour Party (1935–1955) Later ennobled asEarl Attlee |