Paul-Joseph Le Moyne de Longueuil (September 17, 1701 – May 12, 1778) was a seigneur and colonial army officer in New France and governor of Trois-Rivières from 1757 to 1760.
In 1726, he became lieutenant in the colonial army and commander of Fort Frontenac; the following year, Longueuil became captain of his owner company.
In October 1728, he married Marie-Geneviève Joybert de Soulanges; through this marriage, he acquired the seigneuries of L’Islet-du-Portage, Pointe-à-l’Orignal on the Ottawa River and Soulanges.
During the War of the Austrian Succession, the neighbouring native tribes revolted against the French but Longueuil was later able to reestablish peace in the region.
He sold the seigneury of L’Islet-du-Portage; the remaining properties came under the control of his son Joseph-Dominique-Emmanuel, who later served in the Legislative Council of Lower Canada.