Medmenham is a village and civil parish in south-west Buckinghamshire, England. It is on the River Thames, about 3+1⁄2 miles (5.6 km) southwest of Marlow and 3 miles (4.8 km) east of Henley-on-Thames. The parish also includes Danesfield, a housing estate predominantly for RAF officers, although families of other ranks from the RAF, Royal Navy and British Army also live there.

Hudson Ewbanke Kearley, 1st Viscount Devonport,, styled Lord Devonport between 1910 and 1917, was an English grocer and politician. He founded the International Tea Company's Stores, became the first chairman of the Port of London Authority, and served as Minister of Food Control during World War I.