Arthur Charles Valerian Wellesley, 9th Duke of Wellington, 9th Prince of Waterloo, 10th Duke of Ciudad Rodrigo, 9th Duke of Victoria, GE, OBE, DL, styled Earl of Mornington between 1945 and 1972 and Marquess of Douro between 1972 and 2014, is a British peer and politician. He served as Conservative Member of the European Parliament for Surrey (1979–1984) and Surrey West (1984–1989) and is eligible to sit as a hereditary peer in the House of Lords.

Brigadier Arthur Valerian Wellesley, 8th Duke of Wellington,, styled Marquess of Douro between 1943 and 1972, was a senior British peer and a brigadier in the British Army. His main residence was Stratfield Saye House in Hampshire.