| Birth Date: | 4 April 1914 |
| Birth Place: | Amsterdam, the Netherlands |
| Death Date: | 4 June 1996 (aged 82) |
| Death Place: | Amsterdam, the Netherlands |
| Sport: | Discus throw |
| Club: | Sagitta, Amsterdam |
| Show-Medals: | yes |
Petronella Gerardina "Nel" Roos-Lodder (4 April 1914 – 4 June 1996) was a Dutch discus thrower. She competed at 1948 Summer Olympics and finished in 13th place.