Infante John, Constable of Portugal (Santarém, January 13, 1400 – October 18, 1442, Alcácer do Sal) is a Portuguese infante (prince) of the House of Aviz, Constable of Portugal and master of the Portuguese Order of St. James (Santiago).

In Portugal, he is commonly referred to as the O Infante Condestável ("the Constable Prince").