James Harold Wilson, Baron Wilson of Rievaulx, KG, OBE, FRS, FSS, PC was a British Labour Party politician who served as the Prime Minister of the United Kingdom from 1964 to 1970 and 1974 to 1976. He won four general elections, and is the most recent British Prime Minister to have served non-consecutive terms.
First entering Parliament in 1945, Wilson was immediately appointed the Parliamentary Secretary to the Ministry of Works and rose quickly through the ministerial ranks, becoming the Secretary for Overseas Trade in 1947 and being appointed to the Cabinet just months later as the President of the Board of Trade. Later, in the Labour Shadow Cabinet, he served first as Shadow Chancellor of the Exchequer from 1955 to 1961 and then as the Shadow Foreign Secretary from 1961 to 1963, when he was elected Leader of the Labour Party after the sudden death of Hugh Gaitskell. Wilson narrowly won the 1964 election, going on to win a much increased majority in a snap 1966 election.
Wilson's first period as Prime Minister coincided with a period of low unemployment and relative economic prosperity, though also of significant problems with Britain's external balance of payments.