Guy XIV de Laval, François de Montfort-Laval, (28 January 1406 - 2 September 1486, Châteaubriant), comte de Laval, baron de Vitré and of La Roche-Bernard, seigneur of Gâvre, of Acquigny, of Tinténiac, of Montfort and Gaël, of Bécherel, was a French nobleman, known for his account of Joan of Arc. He and his brother André de Lohéac were simultaneously vassals of the duke of Brittany and of the king of France.