Joseph-Dominique-Emmanuel Le Moyne de Longueuil (April 2, 1738 – January 19, 1807) was a soldier, seigneur and politician in New France and Quebec.
After the defeat by the British, he went to Paris, France and stayed with his great uncle Jean-Baptiste Le Moyne de Bienville.
During the American invasion of Quebec, he led a group of Canadian volunteers at Fort Saint-Jean.
Longueuil owned the seigneuries of Soulanges, Nouvelle-Longueuil, and Pointe-à-l’Original, which he had been received from his father.
He left the two remaining seigneuries to his nephew Georges-René Saveuse de Beaujeu, who served in the Legislative Council of the Province of Canada.