Royal Louis was a 116-gun ship of the line of the Royal French Navy, designed in 1757 by Jacques-Luc Coulomb and constructed in 1757 to 1762 by Laurent Coulomb at Brest Dockyard. She was the fourth ship to bear the name, and the only ship of the Sans-Pareil design ever built.
In August 1771, when in dry dock, she was found to have deteriorated beyond repair and was eventually demolished in 1773, without having seen any service.
A scale model on display at the Musée national de la Marine in Paris, , is thought to represent Royal Louis.