| Medal record | ||
|---|---|---|
| Women's Swimming | ||
| Competitor for the Netherlands | ||
| Olympic Games | ||
| Silver | 1960 Rome | 100 m butterfly |
| European Championships | ||
| Bronze | 1962 Leipzig | 100 m butterfly |
Marianne Yvonne Heemskerk (born 28 August 1944 in Rotterdam, Zuid-Holland) is a former butterfly swimmer from the Netherlands, who won the silver medal in the 100 m butterfly at the 1960 Summer Olympics in Rome, Italy. Heemskerk broke the world record in the women's 200m butterfly on 12 June 1960 in Leipzig, East Germany.
| Records | ||
|---|---|---|
| Preceded by Becky Collins |
Women's 200 metre butterfly world record holder (long course) 12 June 1960 – 13 August 1961 |
Succeeded by Becky Collins |