Johanna "Hannie" Maria Termeulen was a freestyle swimmer from the Netherlands, who won three medals at the Summer Olympics.
Achievements
After having claimed the bronze medal in the women"s 4 × 100 m freestyle relay in London in 1948, she won two silvers (100 m freestyle and 4 × 100 m freestyle relay) in Helsinki the same year. She also won three medals at the European championships of 1947 and 1950.