Gmina Susz is an urban-rural gmina (administrative district) in Iława County, Warmian-Masurian Voivodeship, in northern Poland. Its seat is the town of Susz, which lies approximately 21 kilometres (13 mi) north-west of Iława and 77 km (48 mi) west of the regional capital Olsztyn.
The gmina covers an area of 258.95 square kilometres (100.0 sq mi), and as of 2006 its total population is 12,825 (out of which the population of Susz amounts to 5,610, and the population of the rural part of the gmina is 7,215).