Joseph Coëtnempren de Kersaint (29 November 1746 – Isle de France (Mauritius), 1797) was a French Navy officer.
Joseph Coëtnempren de Kersaint was born to the family of Guy François Coëtnempren de Kersaint, a French Navy officer. His two brothers, Armand de Kersaint (1742–1793) and Guy Pierre Kersaint (1747–1822), also served in the Navy.
Kersaint joined the Navy at a Garde-Marine on 25 July 1762. He was promoted to Ensign on 15 September 1771, and to Lieutenant on 5 February 1786.
He served on Heure du Berger from November 1767 to January 1769.
In 1776, he served on the 40-gun frigate Consolante. In June 1778, he transferred to the 64-gun Brillant.
Kersaint married at Isle de France on 3 April 1780.
In June 1782, Kersaint, by then retired from the Navy, departed Brest, captaining the corvette Duc de Chartes. He arrived at Achem on 24 November.
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References
. Georges Lacour-Gayet. La marine militaire de la France sous le règne de Louis XVI . 1910 . Honoré Champion . Paris .