Sir Oswald Ernald Mosley of Ancoats, 6th Baronet, (November 16th, 1896 – December 3rd, 1980) was a British politician who rose to fame in the 1920s as a Member of Parliament and later in the 1930s became leader of the British Union of Fascists (BUF). Mosley inherited the title 'Sir' by virtue of his baronetcy; he was the sixth baronet of a title that had been in his family for centuries.
After military service during the World War I, Mosley was one of the youngest Members of Parliament, representing Harrow from 1918 to 1924, first as a Conservative, then an independent, before joining the Labour Party. He returned to Parliament as the MP for Smethwick at a by-election in 1926, having stood as a Labour candidate, and served as Chancellor of the Duchy of Lancaster in the Labour Government of 1929–31. He was considered a potential Labour Prime Minister, but resigned due to discord with the Government's unemployment policies. He then founded the New Party. He lost his Smethwick seat at the 1931 general election. The New Party became the British Union of Fascists (BUF) in 1932.
Mosley was imprisoned in May 1940 and the BUF was banned. He was released in 1943 and, politically disgraced by his association with fascism, moved abroad in 1951, spending the majority of the remainder of his life in Paris. He stood for Parliament twice in the postwar era, garnering very little support.