Charles le Moyne de Longueuil et de Châteauguay (French pronunciation: [ʃaʁl lə mwan də lɔ̃ɡœj e də ʃatoɡɛ]; 2 August 1626 – February 1685),[1] was a French officer and merchant who was a prominent figure in the early days of Montreal.

His first four years were spent in Huron country with the Jesuits where he learned Indigenous languages.

In 1646 he moved to Fort Ville-Marie (at present-day Montreal) where he spent the remainder of his career and his life.

He had two seigneurial titles conferred on him along with additional lands; in 1672 Governor Louis de Buade de Frontenac and Intendant of New France, Jean Talon confirmed the seigneury title of Longueuil.

He had two daughters and twelve sons,[1] almost all of them achieved some level of fame; the most famous ones being Pierre Le Moyne d'Iberville,[2] founder of Louisiana with Biloxi[2] (Mississippi) and Jean-Baptiste Le Moyne, Sieur de Bienville, co-founder of Mobile[2] and later founder of New Orleans.