Moczysko [mɔˈt͡ʂɨskɔ] is a settlement in the administrative district of Gmina Nidzica, within Nidzica County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 13 kilometres (8 mi) north-east of Nidzica and 38 km (24 mi) south of the regional capital Olsztyn.