Rząśnik may refer to the following places in Poland:
- Rząśnik, Lower Silesian Voivodeship (south-west Poland)
- Rząśnik, Ostrów Mazowiecka County in Masovian Voivodeship (east-central Poland)
- Rząśnik, Wyszków County in Masovian Voivodeship (east-central Poland)