John of Dumbleton (Latin Ioannes De Dumbleton; c. 1310 – c. 1349) was a member of the Dumbleton village community in Gloucestershire, a southwestern county in England. Although obscure, he is considered a significant English fourteenth-century philosopher for his contributions to logic, natural philosophy, and physics. Dumbleton’s masterwork is his Summa Logicae et Philosophiae Naturalis (Summary of Logic and Natural Philosophy), likely to have been composed just before the time of his death.