# List of United Kingdom MPs: A

Following is an incomplete list of past and present Members of Parliament (MPs) of the United Kingdom whose surnames begin with A. Linked years lead to articles about the election of that year
Colour key: Irish National Federation Change UK Coalition Liberal Common Wealth Conservative Independent Liberal Irish Conservative Irish Parliamentary Party Irish Unionist Liberal Unionist Labour Liberal Liberal Democrats Liberal Unionist Liberal-Labour National Labour National Liberal New Party Non-partisan Peelite Sinn Féin SNP The Independents Tory Ulster Unionist Whigs
| Name | 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 the Parliament of Great Britain Later ennobled as Baron 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) | |
| Sir William 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 as Baron 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 as Baron 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 as Baron Abercromby |
| Sir John Abercromby | Independent | 1815 | Clackmannanshire (1815–1817) | |
| Sir Robert Abercromby 5th Baronet of Birkenbog | Independent | 1812 | Banffshire (1812–1818) | |
| Sir Charles 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 the Miners' Federation of Great Britain (1904–1918) President of the South Wales Miners' Federation (1898–1812) |
| William Abraham | Labour | 1885 | Rhondda (1910–1918) Rhondda West (1918–1918) | Treasurer of the Miners' Federation of Great Britain (1904–1918) President of the South Wales Miners' Federation (1898–1812) |
| 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 the Welsh Affairs Select Committee (1980–1981) |
| Archibald Acheson 2nd Earl 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 the Parliament of Ireland Later ennobled as Baron Worlingham |
| Archibald Acheson 3rd Earl of Gosford | Whig | 1830 | Armagh (1830–1847) | Lord Lieutenant of Armagh (1864) Later ennobled as Baron 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) | |
| Sir Arthur 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) |
| Sir Charles Thomas Dyke Acland 12th Baronet of Columb John | Liberal | 1882 | East Cornwall (1882–1885) Launceston (1885–1892) | President of the Churchmen'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) |
| Sir Richard Acland 15th Baronet of Columb John | Liberal | 1935 | Barnstaple (1935–1942) | Chairman of the Common Wealth Party (1942–1943, 1944–1945) |
| Sir Richard Acland 15th Baronet of Columb John | Common Wealth | 1935 | Barnstaple (1942–1945) | Chairman of the Common Wealth Party (1942–1943, 1944–1945) |
| Sir Richard Acland 15th Baronet of Columb John | Labour | 1935 | Gravesend (1947–1955) | Chairman of the Common Wealth Party (1942–1943, 1944–1945) |
| Sir Thomas Dyke Acland 10th Baronet of Columb John | Tory | 1812 | Devon (1812–1818, 1820–1831) | |
| Sir Thomas Dyke Acland 10th Baronet of Columb John | Conservative | 1812 | North Devon (1837–1857) | |
| Sir Thomas Dyke Acland 11th Baronet of Columb John | Conservative | 1837 | West Somerset (1837–1847) | |
| Sir Thomas Dyke Acland 11th Baronet of Columb John | Liberal | 1837 | Devonshire North (1865–1885) Wellington (1885–1886) | |
| Sir Gilbert Acland-Troyte | Conservative | 1924 | Tiverton (1924–1945) | |
| William a'Court 1st Baronet of Heytesbury | Tory | 1806 | Heytesbury (1806–1807) | Also Member of Parliament of Great Britain |
| Charles Ashe A'Court-Repington | Tory | 1820 | Heytesbury (1820–1820) | |
| Edward Henry A'Court-Repington | Tory | 1820 | Heytesbury (1820–1832) | |
| Edward Henry A'Court-Repington | Conservative | 1820 | Tamworth (1837–1847) | |
| William Acton | Irish Conservative | 1841 | Wicklow (1841–1848) | |
| Sir Robert 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 the Parliament of Great Britain |
| Sir Charles 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) |
| Sir Charles Adam | Whig | 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) |
| 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 the Parliament of Great Britain |
| William Augustus Adam | Conservative | 1910 | Woolwich (1910–1910) | |
| Sir William 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 of Sinn Féin in the Dáil Éireann (2011–2018) President of Sinn Féin (1983–2018) Vice President of Sinn Féin (1978–1983) Also Member of the Northern Ireland Forum, Northern Ireland Assembly, Northern Ireland Assembly (1982) and the Dáil 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 the Parliament 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 the Parliament of Great Britain |
| William Adams | Tory | 1801 | Totnes (1801–1811) | Died in office Also a Member of the Parliament of Great Britain |
| 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 the Labour 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 the Scottish Miners' Federation (1914–1922) General Secretary of the Fife 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 the Parliament of Great Britain Later ennobled as Viscount 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 the Parliament of Great Britain |
| William Addington 3rd Viscount Sidmouth | Tory | 1863 | Devizes (1863–1864) | Later ennobled as Viscount 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 as Baron Addison and Viscount Addison |
| Christopher Addison 1st Viscount Addison | Coalition Liberal | 1910 | Shoreditch (1918–1922) | 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 as Baron Addison and Viscount Addison |
| Christopher Addison 1st Viscount Addison | Labour | 1910 | Swindon (1929–1931, 1934–1935) | 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 as Baron Addison and Viscount Addison |
| Henry John Adeane | Whig | 1830 | Cambridgeshire (1830–1832) | |
| Sir Ryland 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 the Transport Select Committee (1992–1993) |
| Bim Afolami | Conservative | 2017 | Hitchin and Harpenden (2017–2024) | |
| Adam Afriyie | Conservative | 2005 | Windsor (2005–2024) | |
| Sir Emanuel 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 as Baron Dover |
| George Agar-Ellis | Whig | 1818 | Seaford (1820–1826) Ludgershall (1826–1830) Okehampton (1830–1831) | First Commissioner of Woods and Forests (1830–1831) Later ennobled as Baron Dover |
| Thomas Agar-Robartes | Whig | 1847 | Cornwall East (1847–1859) | Later ennobled as Baron Robartes |
| Thomas Agar-Robartes | Liberal | 1847 | Cornwall East (1859–1868) | Later ennobled as Baron Robartes |
| Thomas Agar-Robartes, 6th Viscount Clifden | Liberal | 1880 | Cornwall East (1880–1882) | Lord-Lieutenant of Cambridgeshire (1906–1915) Later ennobled as Baron Robartes and Viscount Clifden |
| Thomas Agar-Robartes | Liberal | 1906 | Bodmin (1906–1906) St Austell (1908–1915) | Died in office |
| Sir James Agg-Gardner | Conservative | 1874 | Cheltenham ( 1874–1880, 1885–1895, 1900–1906, 1911–1928) | Died in office |
| Sir Andrew Agnew 7th Baronet of Lochnaw | Whig | 1830 | Wigtownshire (1830–1837) | |
| Sir Andrew Agnew 8th Baronet of Lochnaw | Whig | 1856 | Wigtownshire (1856–1868) | |
| Sir Andrew Agnew 8th Baronet of Lochnaw | Liberal | 1856 | Wigtownshire (1859–1868) | |
| Sir Andrew Agnew 9th Baronet of Lochnaw | Liberal Unionist | 1900 | Edinburgh South (1900–1906) | |
| Sir George Agnew 2nd Baronet of Great Stanhope Street | Liberal | 1906 | Salford West (1906–1918) | |
| Sir Peter Agnew 1st Baronet of Clendry | Conservative | 1931 | Camborne (1931–1950) South Worcestershire (1955–1966) | |
| Sir William 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 for International Trade (2015–2017) |
| Nick Ainger | Labour | 1992 | Pembrokeshire (1992–1997) Carmarthen West and South Pembrokeshire (1997–2010) | Lord Commissioner of the Treasury (2001–2005) |
| Sir Robert Ainslie 1st Baronet of Great Torrington | Independent | 1801 | Milborne Port (1801–1802) | British Ambassador to the Ottoman Empire (1775–1793) Also Member of the Parliament 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) | |
| Sir John Aird 1st Baronet of London | Conservative | 1887 | Paddington North (1887–1906) | Mayor of Paddington (1900–02) |
| Craigie Aitchison | Labour | 1929 | Kilmarnock (1929–1931) | Lord Justice Clerk (1933–1941) Lord Advocate (1929–1933) |
| Craigie Aitchison | National Labour | 1929 | Kilmarnock (1931–1933) | Lord Justice Clerk (1933–1941) Lord Advocate (1929–1933) |
| 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) |
| Sir Max 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 as Baron Beaverbrook |
| Sir Max Aitken 2nd Baronet of Cherkley | Conservative | 1945 | Holborn (1945–1950) | Later ennobled as Baron Beaverbrook |
| Nickie Aiken | Conservative | 2019 | Cities of London and Westminster (2019–2024) | Leader of Westminster City Council (2017–2020) |
| Sir William 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 as Viscount Chilston |
| Sadik Al-Hassan | Labour | 2024 | North Somerset (2024–present) | |
| Bayo Alaba | Labour | 2024 | Southend East and Rochford (2024–present) | |
| Sir Irving Albery | Conservative | 1924 | Gravesend (1924–1945) | |
| Austen Albu | Labour | 1948 | Edmonton (1948–1974) | Minister for Economic Affairs (1965–1967) Chairman of the Fabian Society (1953–1954) |
| Thomas Alcock | Independent | 1826 | Newton (1826–1830) | High Sheriff of Surrey (1837) |
| Thomas Alcock | Whig | 1826 | Ludlow (1839–1840) East Surrey (1847–1859) | High Sheriff of Surrey (1837) |
| Thomas Alcock | Liberal | 1826 | East Surrey (1859–1865) | High Sheriff of Surrey (1837) |
| William Congreve Alcock | Tory | 1801 | Waterford City (1801–1803) | Also Member of the Parliament of Ireland |
| Sir Percy Alden | Liberal | 1906 | Tottenham (1906–1918) | |
| Sir Percy Alden | Labour | 1906 | 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 the Labour Party in the House 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 as Viscount Alexander of Hillsborough and Earl Alexander of Hillsborough |
| Boyd Alexander | Independent | 1803 | Clyde Burghs (1803–1806) | |
| Sir Claud Alexander 1st Baronet of Ballochmyle | Conservative | 1874 | Ayrshire South (1874–1885) | |
| Sir Danny 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 the Parliament 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 as Earl 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) | |
| Sir William 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) |
| Sir Alexander 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 of Parliament 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 the National 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) |
| Sir John 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 of Political 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) | Acting Leader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Heidi Allen | Change UK | 2015 | South Cambridgeshire (2019) | Acting Leader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Heidi Allen | Independent | 2015 | South Cambridgeshire (2019) | Acting Leader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Heidi Allen | The Independents | 2015 | South Cambridgeshire (2019) | Acting Leader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Heidi Allen | Liberal Democrats | 2015 | South Cambridgeshire (2019) | Acting Leader of Change UK (2019) Change UK Spokesperson for Welfare, Pensions, Social Care and Business (2019) |
| Henry George Allen | Liberal | 1880 | Pembroke (1880–1885) Pembroke and Haverfordwest (1885–1886) | |
| Sir Ronald Wilberforce Allen | Liberal | 1923 | Leicester South (1923–1924) | |
| Scholefield Allen | Labour | 1945 | Crewe (1945–1974) | Recorder of Blackburn (1947–1970) |
| W. E. D. Allen | Ulster Unionist | 1929 | Belfast West (1929–1931) | |
| W. E. D. Allen | New Party | 1929 | Belfast West (1931) | |
| Sir William Allen | Irish Unionist | 1917 | North Armagh (1917–1921) | Sovereign Grand Master of the Royal Black Preceptory (1924–1947) |
| Sir William Allen | Ulster Unionist | 1917 | North Armagh (1917–1922) Armagh (1922–1947) | Sovereign Grand Master of the Royal Black Preceptory (1924–1947) |
| 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 of Traditional 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) | |
| Sir Henry Allsopp 1st Baronet of Hindlip Hall | Conservative | 1874 | East Worcestershire (1874–1880) | Later ennobled as Baron Hindlip |
| Samuel Allsopp 2nd Baronet of Hindlip Hall | Conservative | 1873 | East Staffordshire (1873–1880) Taunton (1882–1887) | Later ennobled as Baron Hindlip |
| Joseph Alpass | Labour | 1929 | Bristol Central (1929–1931) Thornbury (1945–1950) | |
| Cuthbert Alport | Conservative | 1950 | Colchester (1950–1961) | High Steward of Colchester (1967) British High Commissioner to the Federation 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 as Baron 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 as Baron Alton |
| David Alton | Liberal Democrats | 1979 | Liverpool Mossley Hill (1988–1997) | Liberal Chief Whip (1985–1987) Later ennobled as Baron Alton |
| Daniel Ambrose | Irish National Federation | 1892 | South Louth (1892–1896) | Died in office |
| Robert Ambrose | Irish National Federation | 1893 | West Mayo (1893–1910) | |
| Robert Ambrose | Irish Parliamentary Party | 1893 | West Mayo (1900–1910) | |
| Sir William Amcotts-Ingilby 2nd Baronet of Kettlethorpe Hall and Ripley 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 as Baron 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) |
| Leo Amery | Unionist | 1911 | Birmingham South (1912–1918) | 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) |
| Leo Amery | Conservative | 1911 | Birmingham Sparkbrook (1918–1945) | 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) |
| Mike Amesbury | Labour | 2017 | Weaver Vale (2017–2024) Runcorn and Helsby (2024–present) | Shadow Minister for Housing and Planning (2020–present) Shadow Minister for Employment (2018–2020) |
| Sir David 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 the National Union of Conservative and Constitutional Associations (1968) Later ennobled as Baron Amherst and Earl Amherst (Viscount Holmesdale) |
| William Pitt Amherst 2nd Earl Amherst | Ultra-Tories | 1829 | East Grinstead (1829–1832) | Later ennobled as Earl Amherst (Viscount Holmesdale) and Baron 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 the National Union of Docks, Wharves and Shipping Staffs (1918–1919) Chair of the Fawcett Association (1911–1919) Later ennobled as Baron Ammon |
| Alan Amos | Conservative | 1987 | Hexham (1987–1992) | Mayor of Worcester (2014–2015) |
| Gideon Amos | Liberal Democrats | 2024 | Taunton and Wellington (2024–present) | |
| James Amyatt | Tory | 1801 | Southampton (1801–1806) | Also Member of Parliament 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 as Marquess of Lothian |
| Alexander Anderson | Labour | 1945 | Motherwell (1945–1954) | |
| Sir Alan 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 the Foreign Affairs Select Committee (1997–2005) Later ennobled as Baron 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) |
| Sir John Anderson 1st Baronet of Mill Hill | Tory | 1801 | London (1801–1806) | Also Member of Parliament 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 the Home Department (1922–1932) Joint Permanent Under-Secretary to the Lord Lieutenant of Ireland (1920–1922) Later ennobled as Viscount Waverley |
| Lee Anderson | Conservative | 2019 | Ashfield (2019–2024) | |
| Lee Anderson | Reform UK | 2019 | 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 as Earl of Yarborough |
| Charles Anderson-Pelham 3rd Earl of Yarborough | Whig | 1857 | Great Grimsby (1857–1859) | Later ennobled as Earl of Yarborough |
| Charles Anderson-Pelham 3rd Earl of Yarborough | Liberal | 1857 | Great Grimsby (1859–1862) | Later ennobled as Earl of Yarborough |
| 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 of Parliament of Great Britain |
| Sir Norman 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 of Parliament 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 as Viscount Valentia and Baron Annesley of Bletchington |
| Francis Annesley | Tory | 1801 | Reading (1801–1806) | Also Member of Parliament of Great Britain |
| George Annesley 2nd Earl of Mountnorris 9th Viscount Valentia | Independent | 1808 | Yarmouth (1808–1810) | Later ennobled as Viscount Valentia and Earl of Mountnorris |
| George Annesley | Tory | 1830 | County Wexford (1830–1831) | Later ennobled as Viscount Valentia |
| Hugh Annesley 5th Earl Annesley | Tory | 1857 | County Cavan (1857–1874) | Representative Peer of Ireland (1877–1908) Later ennobled as Earl Annesley |
| William Annesley 3rd Earl Annesley | Tory | 1815 | Downpatrick (1815–1820) | High Sheriff of Down (1822) Later ennobled as Earl Annesley and Viscount Glerawly |
| William Annesley 4th Earl Annesley | Conservative | 1852 | Great Grimsby (1852–1857) | Representative Peer for Ireland (1867–1874) Later ennobled as Earl Annesley and Viscount 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) |
| Sir George Anson | Whig | 1806 | Lichfield (1806–1841) | Governor of the Royal Hospital Chelsea (1849) Colonel of the 4th 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 as Earl of Lichfield and Viscount Anson |
| Thomas Anson 2nd Earl of Litchfield | Whig | 1847 | Lichfield (1847–1854) | Lord-Lieutenant of Staffordshire (1863–1871) Later ennobled as Earl of Lichfield |
| Thomas Anson 1st Viscount Anson | Whig | 1801 | Lichfield (1801–1806) | Also Member of Parliament of Great Britain Later ennobled as Viscount Anson and Baron Soberton |
| Sir William 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) |
| Sir William Anson 3rd Baronet of Hatch Beauchamp | Conservative | 1899 | Oxford University (1912–1914) | Parliamentary Secretary to the Board of Education (1902–1905) Vice-Chancellor of Oxford University (1898–1899) Warden of All Souls College, Oxford (1881–1914) |
| Henry Torrens Anstruther | Liberal Unionist | 1886 | St Andrews Burghs (1886–1903) | |
| Sir John Anstruther 1st Baronet of Elie 4th Baronet of Anstruther | Independent | 1806 | Anstruther Burghs (1806–1811) | Also Member of Parliament of Great Britain |
| Sir Robert Anstruther 5th Baronet of Wrae, Balcaskie & Braemore | Liberal | 1864 | Fife (1864–1880) | Lord Lieutenant of Fife (1864–1886) |
| Sir Robert Anstruther 5th Baronet of Wrae, Balcaskie & Braemore | Independent Liberal | 1864 | St Andrews Burghs (1885–1886) | Lord Lieutenant of Fife (1864–1886) |
| Sir Robert Anstruther 5th Baronet of Wrae, Balcaskie & Braemore | Liberal Unionist | 1864 | St Andrews Burghs (1886–1886) | Lord Lieutenant of Fife (1864–1886) |
| 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 the 1922 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 as Baron Kilmany |
| Tonia Antoniazzi | Labour | 2017 | Gower (2017–present) | Shadow Minister for Northern Ireland (2021–present) |
| Sir Edmund Antrobus 3rd Baronet of Antrobus Hall | Conservative | 1841 | East Surrey (1841–1847) | |
| Sir Edmund Antrobus 3rd Baronet of Antrobus Hall | Peelite | 1841 | Wilton (1855–1859) | |
| Sir Edmund Antrobus 3rd Baronet of Antrobus Hall | Liberal | 1841 | 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 of Parliament of Great Britain |
| Charles George James Arbuthnot | Tory | 1831 | Tregony (1831–1832) | Colonel of the 72nd Regiment of Foot (1870) Colonel of the 91st Regiment of Foot (1864–1870) Colonel of the 89th Regiment of Foot (1857–1864) Page of Honour (1812–17) |
| Gerald Arbuthnot | Conservative | 1910 | Burnley (1910–1910) | |
| Sir Hugh Arbuthnott | Tory | 1826 | Kincardineshire (1826–1835) | Colonel of the 79th Regiment of Foot (1862–1868) Colonel of the 38th Regiment of Foot (1843–1862) |
| Sir Hugh Arbuthnott | Conservative | 1826 | Kincardineshire (1935–1865) | Colonel of the 79th Regiment of Foot (1862–1868) Colonel of the 38th Regiment of Foot (1843–1862) |
| James Arbuthnot | Conservative | 1987 | Wanstead and Woodford (1987–1997) North East Hampshire (1997–2015) | Chairman of the Defence Select Committee (2005–2014) Shadow Secretary of State for Trade (2003–2005) Opposition Chief Whip of the House of Commons (1997–2001) Minister of State for Defence Procurement (1995–1997) Parliamentary Under-Secretary of State for Social Security (1994–1995) Later ennobled as Baron Arbuthnot of Edrom |
| Sir John Arbuthnot 1st Baronet of Kittybrewster | 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 the National Agricultural Labourers' Union (1872–?) |
| Sir Edward Archdale 1st Baronet of Riversdale | Irish Unionist | 1898 | North Fermanagh (1898–1903, 1916–1921) | Grand Master of the Orange 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 of Parliament of Northern Ireland |
| Sir Edward Archdale 1st Baronet of Riversdale | Ulster Unionist | 1898 | North Fermanagh (1921–1922) | Grand Master of the Orange 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 of Parliament of Northern Ireland |
| Mervyn Edward Archdale | Tory | 1834 | Fermanagh (1834–1834) | High Sheriff of Fermanagh (1879) |
| Mervyn Edward Archdale | Conservative | 1834 | Fermanagh (1834–1874) | High Sheriff of Fermanagh (1879) |
| 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 of Parliament of Ireland |
| Mervyn Archdall | Tory | 1802 | Fermanagh (1802–1834) | Lieutenant-Governor of the Isle of Wight (1915–1938) Grand Master of the Orange Order (1818–1822) Governor of County Fermanagh (1813–1831) |
| Richard Archdall | Independent | 1802 | Kilkenny City (1802–1802) | Also Member of Irish House of Commons |
| Richard Archdall | Tory | 1802 | Dundalk (1802–1806) | Also Member of Irish House of Commons |
| Jeffrey Archer | Conservative | 1969 | Louth (1969–1974) | Later ennobled as Baron Archer of Weston-super-Mare |
| Peter Archer | Labour | 1966 | Rowley Regis and Tipton (1966–1974) Warley West (1974–1992) | President of the Fabian 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 the Fabian Society (1979–1980) Solicitor General for England and Wales (1974–1979) Later ennobled as Baron Archer of Sandwell |
| John Archer-Houblon | Independent | 1810 | Essex (1810–1820) | High Sheriff of Essex (1801–1802) |
| Sir Martin Archer-Shee | Conservative | 1910 | Finsbury Central (1910–1918) Finsbury (1918–1923) | |
| Sir Richard 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 as Baron 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) |
| Colonel C. 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 |
| Sir Alfred Arnold | Conservative | 1895 | Halifax (1895–1900) | |
| Jacques Arnold | Conservative | 1987 | Gravesham (1987–1997) | |
| Sir Tom 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) |
| Sir William 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 |
| Paddy Ashdown | Liberal Democrats | 1983 | Yeovil (1988–2001) | Leader of the Liberal Democrats (1988–1999) High Representative for Bosnia and Herzegovina (2002–2006) Later ennobled as Baron Ashdown of Norton-sub-Hamdon |
| 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 as Earl 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 as Earl Attlee |
* AS
* George Ashburnham, Viscount St Asaph
* Percy Ashburnham, MP for Bere Alston (1825–1830)
* David Ashby MP for North West Leicestershire (1983–1997)
* William Henry Ashhurst, MP for Oxfordshire (1815 - 1830)
* Anthony John Ashley, MP for Gatton (1831–1832)
* Wilfrid Ashley, MP for Blackpool (1906–1918), Fylde (1918–1922) and New Forest and Christchurch (1922–1932)
* Jack Ashley, Baron Ashley of Stoke (1966–1992)
* Anthony Ashley-Cooper, 7th Earl of Shaftesbury
* Cropley Ashley-Cooper, 6th Earl of Shaftesbury
* Henry Ashley-Cooper
* William Ashley-Cooper
* Sir Ellis Ashmead-Bartlett, MP for Eye (1880–1885) and Sheffield Ecclesall (1885–1902)
* Ellis Ashmead-Bartlett, MP for Hammersmith North (1924–1926)
* Sir Hubert Ashton, MP for Chelmsford (1950–1964)
* Joe Ashton (1968–2001)
* Thomas Ashton
* Sir Robert Aske, Newcastle upon Tyne East, 1923–1924, 1929–1931
* Jack Aspinwall (1979–1997)
* John Aspinall, MP for Clitheroe (1853)
* Jonathan Ashworth, Leicester South, 2011–present
* Ralph Assheton, MP for Clitheroe (1868–1880)
* Ralph Assheton, MP for Rushcliffe (1934–1945), City of London (1945–1950) and Blackburn West (1950–1955)
* Fred Astbury
* John Harvey Astell, MP for Cambridge (1852–1853) and Ashburton (1859–1865)
* William Astell
* Sir Edward Astley, 4th Baronet
* Sir Jacob Astley, 5th Baronet
* Sir John Astley, 1st Baronet
* Sir John Dugdale Astley, 3rd Baronet, MP for North Lincolnshire (1874–1880)
* Sir John Astor, MP for Plymouth Sutton (1951–1959)
* John Astor, MP for Newbury (1964–1974)
* John Jacob Astor, 1st Baron Astor of Hever (1922–1945)
* Michael Astor MP for East Surrey (1945–1951)
* Nancy Astor, Viscountess Astor (1919–1945)
* Waldorf Astor, 2nd Viscount Astor (1910–1919)
* William Astor, 3rd Viscount Astor (1935–1945,1951–1952)
* H. H. Asquith, East Fife 1886–1918, Paisley, 1920–1924
* AT
* Arthur Atherley (1806–1807, 1812–1818, 1831–1835)
* Candy Atherton, Falmouth and Camborne, 1997–2005
* Llewellyn Atherley-Jones
* Albert Atkey, MP for Nottingham Central (1918–1922)
* Charlotte Atkins (1997–2010)
* Humphrey Atkins (1955–1987)
* John Atkins, MP for Arundel 1802–1806, 1826–1832, and for the City of London in 1812–1818
* Sir Robert Atkins, MP for Preston North (1979–1983) and South Ribble (1983–1997)
* Ronald Atkins, Preston North, 1966–1970, 1974–1979
* Victoria Atkins, MP for Louth and Horncastle (2015–present)
* Sir Cyril Atkinson, MP for Altrincham (1924–1933)
* David Atkinson, MP for Bournemouth East (1977–2005)
* Henry Atkinson, (1885–1886, 1886–1892)
* Norman Atkinson, Tottenham, 1964–1987
* Peter Atkinson, MP for Hexham (1992–2010)
* John Atkyns-Wright, MP for Oxford (1802–1807, 1812–1820)
* Walter Annis Attenborough, MP for Bedford
* John Attersoll, MP for Wootton Bassett (1812–1813)
* Humphrey Attewell (1945–1950)
* Clement Attlee (1922–1956)
* John Attwood, MP for Harwich (1841–1847)
* Matthias Attwood, MP for Whitehaven (1834–1837)
* Thomas Attwood, Radical MP
* Matthias Wolverley Attwood, MP for Greenwich (1837–1841)
* AU
* Sir John Aubrey, 6th Baronet
* Sir Henry Aubrey-Fletcher, 4th Baronet, MP for Horsham (1880–1885) and Lewes (1885–1910)
* Thomas Austen, MP for West Kent (1845–1847)
* David Austick, Ripon, 1973–1974
* Sir Herbert Austin, 1st Baron Austin, MP for Birmingham King's Norton (1918–1924)
* Herschel Lewis Austin, Stretford, 1945–1950
* Ian Austin, Baron Austin (2005–2019)
* Sir John Austin
* John Austin (1992–2010)
* AW
* Stan Awbery (1945–1964)
* Daniel Awdry, MP for Chippenham (1962–1979)
* AY
* Walter Ayles (1923–1924, 1929–1931, 1945–1953)
* Acton Smee Ayrton, (1857–1874)
* Barbara Ayrton-Gould, Hendon North, 1945–1950
Out of Order to Add