Gmina Kolno is a rural gmina (administrative district) in Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland. Its seat is the village of Kolno, which lies approximately 41 kilometres (25 mi) north-east of the regional capital Olsztyn.

The gmina covers an area of 178.34 square kilometres (68.9 sq mi), and as of 2006 its total population is 3,442.

Gmina Kolno contains the villages and settlements of Augustówka, Bęsia, Bocianowo, Gajówka Augustowska, Górkowo, Górowo, Kabiny, Kolenko, Kolno, Kominki, Kruzy, Lutry, Oterki, Otry, Ryn Reszelski, Samławki, Tarniny, Tejstymy, Wągsty, Wójtowo, Wólka and Wysoka Dąbrowa.

Gmina Kolno is bordered by the gminas of Biskupiec, Bisztynek, Jeziorany, Reszel and Sorkwity.

• Polish official population figures 2006