Guy François Coëtnempren de Kersaint (7 June 1703 in Plounéventer – 20 November 1759 in Battle of Quiberon Bay) was a French Navy officer.
[1] Kersaint joined the Navy as a Garde-Marine in February 1722, and was promoted to Ensign in October 1731, Lieutenant in May 1741, and Captain in January 1747.
He led a division to cruise off Guinea, destroying British factories and engaging in commerce raiding.
On 21 October 1757, near Caicos, he encountered three British ships, leading to the Battle of Cap-Français.
During the battle, as Kersaint was attempted to come to the aid of Conflans, Thésée performed a turn without closing her lower gunports.