Sir Charles Brian Blagden FRS (17 April 1748 – 26 March 1820) was a British physician and scientist. He served as a medical officer in the Army (1776–1780) and later held the position of Secretary of the Royal Society (1784–1797). Blagden won the Copley Medal in 1788 and was knighted in 1792.He died in Arcueil, France in 1820, and was buried at Père Lachaise Cemetery in Paris.