| Birth Date: | 22 July 1923 |
| Birth Place: | Amsterdam, the Netherlands |
| Death Date: | 25 January 2005 (aged 81) |
| Death Place: | Amsterdam, the Netherlands |
| Sport: | Sprint running |
| Club: | Zeeburg, Amsterdam |
| Show-Medals: | yes |
Jeannette Josephina Maria "Netti" Witziers-Timmer (née Timmer, 22 July 1923 – 25 January 2005) was a Dutch sprinter. In 1944 she was a member of the Dutch teams that set world records in the 4×110 yard and 4×200 m relays. Two years later she won a European title, and in 1948 an Olympic gold medal in the 4×100 m relay with Xenia Stad-de Jong, Gerda van der Kade-Koudijs, and Fanny Blankers-Koen. The 1948 Dutch relay team was remarkable (for that era) in that all its members were married and had children.[1]
Witziers-Timmer died on January 25, 2005. She was 81 at the time of her death.[2]