Louis Léon Jacob (11 November 1768 – 14 March 1854) was a French admiral. He was born at , Charente, was educated at Rochefort, and volunteered from a clerkship in the marine bureau to the navy (1784). He was promoted to ensign in 1793, served as a lieutenant on the Ça Ira in her fight against a superior British force on 14 March 1795, and was taken prisoner when the ship was captured. After his release, Jacob was appointed to the frigate Bellone. He took part in the Battle of Tory Island and was again taken prisoner when Bellone surrendered to Ethalion.