Saint-Guillaume-Nord (French pronunciation: [sɛ̃ ɡijom nɔʁ]) is the southernmost unorganized territory in the Lanaudière region of Quebec, Canada, part of the Matawinie Regional County Municipality. Its only community is the hamlet of Saint-Guillaume-Nord, located at confluence of the Matawin River and Cypress Creek, a dozen miles west of Saint-Michel-des-Saints and just east of the north-east entrance to the Mont-Tremblant National Park.