Gmina Miłomłyn is an urban-rural gmina (administrative district) in Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. Its seat is the town of Miłomłyn, which lies approximately 12 kilometres (7 mi) north-west of Ostróda and 44 km (27 mi) west of the regional capital Olsztyn. The gmina covers an area of 160.91 square kilometres (62.1 sq mi), and as of 2006 its total population is 4,988 (out of which the population of Miłomłyn amounts to 2,305, and the population of the rural part of the gmina is 2,683).