Charles-Henri-Louis d'Arsac, chevalier de Ternay (27 January 1723 - 15 December 1780) was a French naval officer. Most active in the Seven Years' War and the War of American Independence, Ternay was the naval commander of a 1762 expedition that successfully captured St. John's Newfoundland. He was appointed commander of the Marine Royale, French naval forces, as part of the project code named Expédition Particulière that brought French troops to American soil in 1780. He died aboard ship off Newport, Rhode Island.