Charles Lennox, 3rd Duke of Richmond

Field Marshal His Grace The Duke of Richmond KG PC FRS
Portrait by George Romney, circa 1777
Secretary of State for the Southern Department
In office 23 May 1766 – 29 July 1766
Monarch	George III
Prime Minister	The Marquess of Rockingham
Preceded by	Henry Conway
Succeeded by	The Earl of Shelburne
Personal details
Born	(1735-02-22)22 February 1735 Westminster, London, England
Died	29 December 1806(1806-12-29) (aged 71) Goodwood, Sussex, England
Spouse(s)	Mary Bruce
Relations	The Duke of Richmond, Father Sarah Cadogan, Mother
Awards	Knight of the Garter
Military service
Allegiance	Kingdom of Great Britain
Service/branch	British Army
Years of service	1752–1806
Rank	Field Marshal
Commands	33rd Regiment of Foot 72nd Regiment of Foot
Battles/wars	Seven Years' War

Field Marshal Charles Lennox, 3rd Duke of Richmond, 3rd Duke of Lennox, 3rd Duke of Aubigny, KG PC FRS (22 February 1735 – 29 December 1806), styled Earl of March until 1750, was a British politician and British Army officer. He associated with the Rockingham Whigs and rose to hold the post of Southern Secretary for a brief period. He was noteworthy for his support for the colonists during the American Revolutionary War, his support for a policy of concession in Ireland and his advanced views on the issue of parliamentary reform. He went on to be a reforming Master-General of the Ordnance first in the Rockingham ministry and then in the ministry of William Pitt.

The son of Charles Lennox, 2nd Duke of Richmond and Sarah Lennox, daughter of William Cadogan, 1st Earl Cadogan, and brother of the famous Lennox sisters, he was educated at Westminster School and Leiden University and succeeded his father as Duke of Richmond in August 1750. He was commissioned as an ensign in the 2nd Foot Guards in March 1752, promoted to captain in the 20th Regiment of Foot on 18 June 1753 and was admitted a Fellow of the Royal Society on 11 December 1755.