| Full Name: | Johanna Maria Termeulen |
| Birth Date: | 18 February 1929 |
| Birth Place: | Wiesbaden, Germany |
| Death Date: | 1 March 2001 (aged 72) |
| Death Place: | Amsterdam, the Netherlands |
| Sport: | Swimming |
| Club: | HDZ, Amsterdam |
| Show-Medals: | yes |
Johanna Maria "Hannie" Termeulen (18 February 1929 – 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 × 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.[1]