Hejdyk [ˈxɛi̯dɨk] (German: Heidig; until 1938: Heidik) is a village in the administrative district of Gmina Pisz, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 19 kilometres (12 mi) south-west of Pisz and 75 km (47 mi) east of the regional capital Olsztyn.
Before 1945 the area was part of Germany (East Prussia). Following World War II the native German populace was expelled and replaced by Poles.
Coordinates: 53°32′N 21°33′E / 53.533°N 21.550°E