Henry Wellesley, 1st Baron Cowley GCB (20 January 1773 – 27 April 1847) was an Irish diplomat and politician. He was the younger brother of the soldier and politician the first Duke of Wellington. He is known particularly for his service as British Ambassador to Spain during the Peninsular War where he acted in cooperation with his brother to gain the support of Cortes of Cádiz. His later postings included being Ambassador in Vienna where he dealt with Metternich and British Ambassador to France during the reign of Louis Philippe I.