Duke of Wellington is a title in the Peerage of the United Kingdom. The name derived from Wellington in Somerset. The title was created in 1814 for Arthur Wellesley, 1st Marquess of Wellington, the Anglo-Irish military commander who is best known for leading the decisive victory with Field Marshal von Blücher over Napoleon's forces at Waterloo in Brabant. Wellesley later served twice as British prime minister.

Wellington is a market town in Somerset, England. It is situated 7 miles (11 km) south west of Taunton, near the border with Devon, which runs along the Blackdown Hills to the south of the town. The town had a population of 16,669, which includes the residents of the parish of Wellington Without, and the villages of Tone and Tonedale.