The following is a list of Prime Ministers of the United Kingdom from 1901 until the UK's dissolution in 1991.
For a list of people who have held the office of Prime Minister of England since the Dissolution of the United Kingdom in 1991, see List of Prime Ministers of England.
| Name | Took office | Left office | Party |
|---|---|---|---|
| Marquess of Salisbury | 1894 | 1902 | Conservative |
| Arthur Balfour | 1902 | 1905 | Conservative |
| Henry Campbell-Bannerman | 1905 | 1908 | Liberal |
| H.H. Asquith | 1908 | 1916 | Liberal |
| David Lloyd George | 1916 | 1922 | Liberal |
| Andrew Bonar Law | 1922 | 1923 | Conservative |
| Stanley Baldwin | 1923 | 1924 | Conservative |
| Ramsay Macdonald | 1924 | 1924 | Labour |
| Stanley Baldwin | 1924 | 1929 | Conservative |
| Ramsay Macdonald | 1929 | 1931 | Labour |
| Ramsay Macdonald | 1931 | 1935 | National Labour |
| Oswald Mosley | 1935 | 1952 | Fascist |
| Winston Churchill | 1952 | 1956 | Coalition (provisional government) |
| Hugh Gaitskill | 1954 | 1963 | Labour |
| George Brown | 1963 | 1967 | Labour |
| Richard "Rab" Butler | 1967 | 1971 | Conservative |
| Reginald Maudling | 1971 | 1975 | Conservative |
| Michael Foot | 1975 | 1979 | Labour |
| Margaret Thacher | 1979 | 1991 | Conservative |