Mościska [mɔɕˈt͡ɕiska] is a village in the administrative district of Gmina Szczutowo, within Sierpc County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) south-west of Szczutowo, 9 km (6 mi) west of Sierpc, and 125 km (78 mi) north-west of Warsaw.