Baron Methuen, of Corsham in the County of Wiltshire, is a title in the Peerage of the United Kingdom. It was created in 1838 for the former Member of Parliament for Wiltshire and Wiltshire North, Paul Methuen. His grandson, the third Baron, was a distinguished soldier who became Field marshal. His son, the fourth Baron, was a professional artist and Royal Academician. On his death, the title passed to his younger brother, the fifth Baron. The seventh Baron, who succeeded his elder brother in 1994, was one of the ninety hereditary peers elected to the House of Lords after the passage of the House of Lords Act 1999, and sat on the Liberal Democrat benches. As of 2014, the title is held by his first cousin once removed, the eighth baron, who succeeded to the title in that year.

Sir Paul Methuen, of Bishops Cannings, Wiltshire, was an English diplomat and Whig politician who sat in the House of Commons between 1708 and 1747. He was an envoy to Portugal between 1697 and 1708 and later a holder of public offices, particularly in the Royal household.