Ruda [ˈruda] (German: Ruhden) is a village in the administrative district of Gmina Biała Piska, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) north-west of Biała Piska, 16 km (10 mi) east of Pisz, and 101 km (63 mi) east of the regional capital Olsztyn.