Glaznoty [ɡlazˈnɔtɨ] (German Marienfelde) is a village in the administrative district of Gmina Ostróda, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 17 kilometres (11 mi) south of Ostróda and 47 km (29 mi) south-west of the regional capital Olsztyn.