Bastiaan "Bas" Belder (born 25 October 1946) is a Dutch politician and former Member of the European Parliament (MEP) from the Netherlands. He is a member of the Staatkundig Gereformeerde Partij, part of the European Conservatives and Reformists. He sat on the European Parliament's Committee on Foreign Affairs. He was a substitute for the Committee on Agriculture. Furthermore he was vice-chairman of the delegation for the relations between the European Parliament and Israel and chairman of the European Parliament Working Group on Human Dignity.