François Étienne de Rosily-Mesros (3 June 1748, Rochefort – 19 August 1832, Toulon) was a French naval commander of the French Revolutionary Wars and Napoleonic Wars. He is notable as being chosen by Napoleon to succeed Villeneuve as commander of the combined Franco-Spanish fleet at Cádiz fleet, arriving to take up his appointment just after its defeat at . His name is inscribed on the east side of the Arc de Triomphe.