Joseph Léon de La Marthonie (Saint-Germain-du-Seudre, 27 March 1727 — Saintes, Charente-Maritime, 6 August 1789) was a French Navy officer.
[1] La Marthonie was born to the family of Suzanne Galateau and Léon Raymond de La Marthonie de Gaignon.
La Marthonie joined the Navy as a Garde-Marine on 28 November 1743.
[1] In 1767, La Marthonie captained the 4-gun corvette Lunette.
[3] On 4 May 1779, La Marthonie was promoted to Brigadier des Armées navales.