Gagnon may refer to:
Gagnon (surname), people with the surname Gagnon Gagnon, Quebec, a ghost town in East-Central Quebec, Canada Gagnon River, a river in Quebec, Canada Gagnon v. Scarpelli, a United States Supreme Court case Asset Marketing Systems, Inc. v. Gagnon, an American court case Lac Gagnon Water Aerodrome, a former water aerodrome in Quebec, Canada
See also Gagné