Royal Louis was a 110-gun ship of the line of the French Navy. She was designed and built at Brest Dockyard by Léon-Michel Guignace.
In 1780, Royal Louis was under Louis-André Beaussier de Chateauvert. She took part in the Battle of Cape Spartel on 20 October 1782 under Antoine Hilarion de Beausset, with Jean-René de Verdun de La Crenne as flag captain, although she did not engage.
She was renamed Républicain in September 1792. Under this name, she took part in the Glorious First of June, being the last ship of the French rear. She was attacked, totally dismasted, and struck her colours; however, the British failed to take possession of the ship, which returned to Rochefort.
On 24 December 1794, she took part in the Croisière du Grand Hiver. As the fleet exited Brest harbour, she ran aground with the loss of 10 men. Her crew abandoned ship, and the wreck was destroyed in a tempest a few days later.