Gerald Wellesley, 7th Duke of Wellington, KG (August 21, 1885 - January 4, 1972) was a British diplomat.

His parents were Arthur Charles Wellesley, 4th Duke of Wellington and Kathleen Bulkeley Williams. He married Dorothy Violet Ashton, daughter of Robert Ashton, on April 30, 1914.

He served as a diplomat in the Diplomatic Corps in 1908. He held the office of Third Secretary of the Diplomatic Service between 1910 and 1917, and the office of Second Secretary of the Diplomatic Service between 1917 and 1919.

He was invested as a Fellow of the Royal Institute of British Architects in 1921, and as a Fellow of the Royal Society of Arts in 1935.

He gained the rank of Lieutenant-Colonel in 1939 in the service of the Grenadier Guards. He fought in the Second World War between 1939 and 1945.

He held the office of Lord-Lieutenant of the County of London between 1944 and 1949, and the office of Lord-Lieutenant of Hampshire between 1949 and 1960.

He was invested as a Knight of the Garter in 1951.

He was the author of the following books :

1. The Iconography of the First Duke of Wellington (1935)
   
2. The Diary of a Desert Journey (1938)
   
3. The Journal of Mrs. Arbuthnot (1950)
   
4. A Selection from the Private Correspondence of the First Duke of Wellington (1952)

He had two children :

1. Arthur Valerian Wellesley, 8th Duke of Wellington, b. 2nd July 1915
   
2. Lady Elizabeth Wellesley, b. 26th December 1918