Piastowo Kuyavian-Pomeranian Voivodeship
 Piastowo [pjasˈtɔvɔ] is a village in the administrative district of Gmina Gąsawa within Żnin County Kuyavian-Pomeranian Voivodeship in north-central Poland. It lies approximately 7 kilometres (4 mi) east of Gąsawa 13 km (8 mi) south-east of Żnin and 39 km (24 mi) south of Bydgoszcz.