Johanna Maria "Hannie" Termeulen (18 February 1929 â 1 March 2001) was a freestyle swimmer from the Netherlands, who won three medals at the Summer Olympics. After having claimed the bronze medal in the women's 4 à100 m freestyle relay in London in 1948, she won two silvers (100 m freestyle and 4 à100 m freestyle relay) in Helsinki four years later. She also won three medals at the European championships of 1947 and 1950.