Antoniewo [antɔˈɲɛvɔ] is a village in the administrative district of Gmina Morąg, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 3 kilometres (2 mi) west of Morąg, 25 km (16 mi) north of Ostróda, and 43 km (27 mi) west of the regional capital Olsztyn.