Rentyny [rɛnˈtɨnɨ] is a village in the administrative district of Gmina Gietrzwałd, within Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 4 kilometres (2 mi) north of Gietrzwałd and 18 km (11 mi) west of the regional capital Olsztyn.