Arthur Valerian Wellesley, 8th Duke of Wellington (born 2 July 1915), a retired brigadier in the British Army, was born in Rome, Italy. From 1943 to 1972, when he succeeded his father he was known as Marquess Douro.

His full title is: The Most Noble Arthur Valerian, Duke of Wellington, Knight of the Most Noble Order of the Garter, Lieutenant of the Royal Victorian Order, Officer of the Most Excellent Order of the British Empire.

He attended Eton and New College, Oxford. He then joined the British Army, serving in World War II with the Royal Household Guards ; he eventually rose to the rank of lieutenant colonel, commanding that regiment in 1954. He then moved to the Household Cavalry Regiment , which he began commanding in 1959. He commanded the 22nd Armoured Brigade (1960-1961), served in the British Army of the Rhine, and became defence attaché to Spain in 1964; he retired from the Army in 1968 as a brigadier. During his period of service, he received the Military Cross.

He became colonel-in-chief of the Duke of Wellington's Regiment (West Riding), honourary colonel of the 2nd Battalion, Wessex Regiment , and deputy colonel (to HRH The Princess Royal) of The Blues and Royals. In 1990 he was made a Knight of the Garter.