Grodzki Młyn [ˈɡrɔt͡ski ˈmwɨn] is a village in the administrative district of Gmina Reszel, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 2 kilometres (1 mi) south-west of Reszel, 18 km (11 mi) west of Kętrzyn, and 50 km (31 mi) north-east of the regional capital Olsztyn.