Osiniak-Piotrowo [ɔˈɕiɲak pjɔˈtrɔvɔ] (German: Fedorwalde) is a village in the administrative district of Gmina Ruciane-Nida, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 4 kilometres (2 mi) west of Ruciane-Nida, 21 km (13 mi) west of Pisz, and 68 km (42 mi) east of the regional capital Olsztyn.
Before 1945 the area was part of Germany (East Prussia).
The village has a population of 200.
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