Earl Cowley is a title in the Peerage of the United Kingdom. It was created in 1857 for the diplomat Henry Wellesley, 2nd Baron Cowley. He was Ambassador to France from 1852 to 1867. He was made Viscount Dangan, of Dangan in the County of Meath, at the same time as he was given the earldom. This title is also in the Peerage of the United Kingdom. Lord Cowley was the eldest son of Henry Wellesley, 1st Baron Cowley, who like his son served as Ambassador to France. In 1828 he was created Baron Cowley, of Wellesley in the County of Somerset, in the Peerage of the United Kingdom. A member of the prominent Wellesley family, Cowley was the fifth and youngest son of Garret Wellesley, 1st Earl of Mornington, and the younger brother of Arthur Wellesley, 1st Duke of Wellington, and Richard Wellesley, 1st Marquess Wellesley.

Henry Richard Charles Wellesley, 1st Earl Cowley,, known as The Lord Cowley between 1847 and 1857, was a British diplomat. He served as British Ambassador to France between 1852 and 1867.