Tłubice [twuˈbit͡sɛ] is a village in the administrative district of Gmina Bielsk, within Płock County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) north of Bielsk, 21 km (13 mi) north-east of Płock, and 98 km (61 mi) north-west of Warsaw.