| Birth Date: | 6 December 1931 |
| Birth Place: | Amsterdam, the Netherlands |
| Death Date: | 5 February 2013 (aged 81) |
| Death Place: | Amsterdam, the Netherlands |
| Sport: | Sprint |
| Club: | Sagitta, Amsterdam |
| Show-Medals: | yes |
Petronella "Nel" Büch (6 December 1931, de Vos – 5 February 2013) was a Dutch sprinter. She competed at the 1952 Summer Olympics in the 100 m and 4 × 100 m relay and finished in sixth place in the relay. Between 1950 and 1954 she won five national titles in the 4 × 100 m relay with the team of her club Sagitta.