British House of Commons
| Party | Founded | First represented | Last represented | Dissolved | Maximum representation | MPs | Notes |
|---|---|---|---|---|---|---|---|
| All-for-Ireland League | 1921 | 1909 | 1918 | 1918 | 8 (1910) | ||
| Alliance Party of Northern Ireland | 1970 | 1973 | Present | N/A | 1 (1973) | Naomi Long; Stratton Mills | |
| Anti H-Block | 1981 | 1981 | 1982 | 1982 | 1 (1981) | Bobby Sands; Owen Carron | Merged into Sinn Féin |
| Anti-Waste League | 1921 | 1921 | 1922 | 1922 | 2 (1921) | James Malcolm Monteith Erskine; Murray Sueter | |
| British Socialist Party | 1911 | 1920 | 1920 | 1920 | 1 (1920) | Cecil L'Estrange Malone | Merged into the Communist Party of Great Britain |
| Common Wealth Party | 1942 | 1942 | 1946 | 1993 | 5 (1945) | List | |
| Communist Party of Great Britain | 1920 | 1920 | 1950 | 1991 | 2 (1945) | Willie Gallacher; Cecil L'Estrange Malone; Walton Newbold; Phil Piratin; Shapurji Saklatvala | |
| Conservative Party | 1835 | 1835 | Present | N/A | 473 (1931) | List | |
| Co-operative Party | 1917 | 1918 | Present | N/A | 30 (2001) | List | Affiliated with the Labour Party since 1927 |
| Democratic Labour | 1972 | 1972 | 1974 | 1979 | 1 (1972) | Dick Taverne | |
| Democratic Party | 1969 | 1969 | 1970 | 1971 | 1 (1969) | Desmond Donnelly | |
| Democratic Unionist Party | 1971 | 1971 | Present | N/A | 9 (2005) | List | Formed from the Protestant Unionist Party |
| Empire Free Trade Crusade | 1929 | 1930 | 1931 | 1930s | 1 (1930) | Ernest Taylor | Joint candidate with the United Empire Party |
| English National Party | 1960s | 1976 | 1976 | 1980 | 1 (1976) | John Stonehouse | |
| Federation of Labour | 1944 | 1945 | 1949 | 1949 | 1 (1945) | Jack Beattie | Merged into the Irish Labour Party |
| Green Party of England and Wales | 1973 | 1992 | Present | N/A | 1 (1992) | Cynog Dafis; Caroline Lucas | Dafis was a joint candidate with Plaid Cymru |
| Crofters Party | 1880s | 1885 | 1895 | 1890s | 4 (1885) | Gavin Brown Clark; Charles Fraser-Mackintosh; Roderick MacDonald; Donald Horne Macfarlane | |
| Independent Irish Party | 1852 | 1852 | 1858 | 1858 | 40 (1852) | Split from the Liberal Party | |
| Independent Kidderminster Hospital and Health Concern | 2000 | 2001 | 2010 | N/A | 1 (2001) | Richard Taylor | |
| Independent Liberals | 1931 | 1931 | 1935 | 1935 | 5 (1931) | David Lloyd George; Gwilym Lloyd George; Megan Lloyd George; Frank Owen; Goronwy Owen | Not a separate party per se; its members were official Liberal Party candidates who rejected the National Government. |
| Independent Labour Party | 1893 | 1893 | 1947 | 1975 | Affiliated with the Labour Party from 1900 until 1931 | ||
| Independent Parliamentary Group | 1920 | 1920 | 1921 | 1921 | |||
| Irish Confederate Party | 1847 | 1847 | 1848 | 1848 | 2 (1847) | Thomas Chisholm Anstey; William Smith O'Brien | |
| Irish Labour Party | 1912 | 1949 | 1955 | N/A | 1 (1949) | Jack Beattie | |
| Labour Independent Group | 1949 | 1949 | 1950 | 1950 | 5 (1949) | Lester Hutchinson; John Platts-Mills; Denis Nowell Pritt; Leslie Solley; Konni Zilliacus | |
| Labour Party | 1906 | 1906 | Present | N/A | 418 (1997) | List | Formed from the Labour Representation Committee |
| Labour Representation Committee | 1900 | 1900 | 1906 | 1906 | 29 (1906) | List | Became the Labour Party |
| Liberal Democrats | 1988 | 1988 | Present | N/A | 62 (2005) | List | Merger of the Liberal Party and the Social Democratic Party |
| Liberal Party | 1859 | 1859 | 1988 | 1988 | 387 (1868) | List | Merged into the Liberal Democrats |
| Liberal Unionist Party | 1886 | 1886 | 1912 | 1912 | 77 (1886) | Split from the Liberal Party; merged into the Conservative Party | |
| Mebyon Kernow | 1951 | 1964 | 1970 | N/A | 2 (1964) | Peter Bessell, John Pardoe, David Mudd | multi party membership |
| National Association of Discharged Sailors and Soldiers | 1916 | 1918 | 1921 | 1921 | 1 (1918) | Robert Hewitt Barker | Semi-official candidate, sponsored by local branch of organisation |
| National Democratic and Labour Party | 1918 | 1918 | 1922 | 1923 | 9 (1918) | ||
| National Party | 1917 | 1917 | 1921 | 1921 | 8 (1917) | ||
| Nationalist Party (Ireland) | 1870 | 1870 | 1955 | 1977 | 86 (1885) | List | |
| National Labour | 1931 | 1931 | 1945 | 1945 | 14 (1931) | List | |
| National Liberal Party | 1931 | 1931 | 1968 | 1968 | 55 (1950) | List | Affiliated with the Conservative Party from 1947 |
| National Socialist Party | 1916 | 1918 | 1919 | 1919 | 3 (1918) | Dan Irving; Jack Jones; Will Thorne | Affiliated with the Labour Party |
| New Party | 1930 | 1930 | 1931 | 1932 | |||
| Northern Ireland Labour Party | 1924 | 1943 | 1943 | 1987 | 1 (1943) | Jack Beattie | |
| Plaid Cymru | 1925 | 1966 | Present | N/A | 4 (1992) | List | |
| Protestant Unionist Party | 1966 | 1970 | 1971 | 1971 | 1 (1970) | Ian Paisley | Became the Democratic Unionist Party |
| Referendum Party | 1996 | 1997 | 1997 | 1997 | 1 (1997) | George Gardiner | |
| Republican Labour Party | 1964 | 1966 | 1970 | 1973 | 1 (1970) | Gerry Fitt | |
| Respect Party | 2004 | 2005 | Present | N/A | 1 (2005) | George Galloway | |
| Scottish Labour Party (1888) | 1888 | 1888 | 1892 | 1893 | 1 (1888) | Robert Cunninghame-Graham | Merged into the Independent Labour Party |
| Scottish Labour Party (1976) | 1976 | 1976 | 1979 | 1979 | 2 (1976) | John Robertson; Jim Sillars | Split from the Labour Party |
| Scottish National Party | 1934 | 1945 | Present | N/A | 11 (1979) | List | |
| Scottish Prohibition Party | 1901 | 1922 | 1931 | 1935 | 1 (1922) | Edwin Scrymgeour | |
| Sinn Féin | 1905 | 1917 | Present | N/A | 73 (1918) | List | Sinn Féin MPs do not take their seats |
| Social Democratic Party | 1981 | 1981 | 1988 | 1988 | 29 (1982) | List | Merged into the Liberal Democrats |
| Social Democratic and Labour Party | 1970 | 1970 | Present | N/A | 4 (1992) | List | |
| UK Unionist Party | 1995 | 1995 | 2001 | 2008 | 1 (1995) | Robert McCartney | |
| Ulster Popular Unionist Party | 1980 | 1980 | 1995 | 1995 | 1 (1980) | James Kilfedder | |
| Ulster Unionist Labour Association | 1918 | 1918 | 1922 | N/A | 3 (1918) | Thomas Henry Burn; Thompson Donald; Samuel McGuffin | Linked with the Ulster Unionist Party |
| Ulster Unionist Party | 1905 | 1905 | 2010 | N/A | 20 (1918) | List | At times affiliated to the Conservative Party |
| United Empire Party | 1920s | 1930 | 1931 | 1930s | 1 (1930) | Ernest Taylor | Joint candidate with the Empire Free Trade Crusade |
| United Ulster Unionist Party | 1975 | 1975 | 1982 | 1982 | 1 (1975) | John Dunlop | Split from the Vanguard Unionist Progressive Party |
| United Kingdom Independence Party | 1993 | 2008 | 2008 | N/A | 1 (2008) | Bob Spink | |
| Unity | 1960s | 1969 | 1974 | 1977 | 2 (1970) | Bernadette Devlin; Frank McManus | |
| Vanguard Unionist Progressive Party | 1973 | 1973 | 1978 | 1978 | 3 (1974) | Robert Bradford; William Craig; John Dunlop | Split from and later merged into the Ulster Unionist Party |
Read more about this topic: List Of Political Parties In The United Kingdom By Representation
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