Kałdus [ˈkau̯dus] is a village in the administrative district of Gmina Chełmno, within Chełmno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies 6 kilometres (4 mi) south of Chełmno, 36 km (22 mi) north-west of Toruń, and 36 km (22 mi) north-east of Bydgoszcz.