| Intro | Olympic swimmer |
| Is |
Athlete Swimmer |
| From | Netherlands |
| Type | Sports |
| Gender | female |
| Birth | 4 January 1930, Amsterdam, Amsterdam, North Holland, Netherlands |
| Age: | 90 years |
Adriana Elisabeth “Jannie” de Groot (also Janny; born 4 January 1930) is a retired Dutch swimmer. In 1947 and 1950 she won the national titles and became third in the 200 m breaststroke at the European Aquatics Championships. She competed in the same event at the 1948 Summer Olympics and finished fifth in the final won by Dutch teammate Nel van Vliet.
Jannie’s brother, Daan de Groot (1933–1982), was an Olympic cyclist.