François-Louis de Brach was a French Navy officer.
He notably served during the War of American Independence.
[1] Brach captained the 74-gun Magnifique at the Battle of Ushant on 27 July 1778.
[2] After the battle, he was one of the captains whom Orvilliers praised for their conduct.
[3] In the evening of 9 June 1779, Brach departed Martinique, leading a division comprising the 64-gun Vengeur, the 50-gun Sagittaire, and the frigates Chimère and Aimable, as a diversion to distract the British from another division, under Du Rumain, tasked with the capture of Saint Vincent.