Kałki [ˈkau̯ki] is a village in the administrative district of Gmina Ojrzeń, within Ciechanów County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) west of Ojrzeń, 15 km (9 mi) south-west of Ciechanów, and 71 km (44 mi) north-west of Warsaw.