Roy Harris Jenkins, Baron Jenkins of Hillhead, OM, PC (11 November 1920 – 5 January 2003) was a British Labour Party, SDP and Liberal Democrat politician, and biographer of British political leaders.
The son of a Welsh trade unionist (later a Labour MP and government minister), Roy Jenkins was educated at Oxford University. During the Second World War, Jenkins served as an intelligence officer with the Royal Artillery, and then as a Bletchley Park codebreaker, reaching the rank of captain. Elected to Parliament as a Labour member in 1948, he served in several major posts in Harold Wilson's First Government. As Home Secretary in 1965–1967, he sought to build what he described as "a civilised society", with measures such as the effective abolition in Britain of both capital punishment and theatre censorship, the decriminalisation of homosexuality, relaxing of divorce law, suspension of birching and the liberalisation of abortion law. As Chancellor of the Exchequer in 1967–1970, he pursued a tight fiscal policy. On 8 July 1970, he was elected Deputy Leader of the Labour Party, but resigned in 1972 because he supported entry to the Common Market, while the party opposed it.