Pleśno [ˈplɛɕnɔ] is a village in the administrative district of Gmina Małdyty, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) south-west of Małdyty, 26 km (16 mi) north-west of Ostróda, and 53 km (33 mi) west of the regional capital Olsztyn.