Gmina Troszyn is a rural gmina (administrative district) in Ostrołęka County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Troszyn, which lies approximately 13 km east of Ostrołęka and 104 km north-east of Warsaw. The gmina covers an area of 156.31 km2, and as of 2006 its total population is 4,880 (4,945 in 2011).

Villages

Gmina Troszyn contains the villages and settlements of Aleksandrowo, Borowce, Budne, Choromany, Chrostowo, Chrzczony, Dąbek, Dzbenin, Grucele, Janochy, Kamionowo, Kleczkowo, Kurpie Dworskie, Kurpie Szlacheckie, Łątczyn Szlachecki, Łątczyn Włościański, Mieczki-Abramy, Mieczki-Poziemaki, Mieczki-Ziemaki, Milewo Wielkie, Milewo-Łosie, Milewo-Tosie, Ojcewo, Opęchowo, Puchały, Rabędy, Radgoszcz, Repki, Rostki, Sawały, Siemiątkowo, Stare Janki, Troszyn, Trzaski, Wysocarz, Zamość, Zapieczne, Zawady, Żmijewo-Zagroby, Żmijówek Włościański, Żmijówek-Mans and Żyźniewo.

Neighbouring gminas

Gmina Troszyn is bordered by the gminas of Czerwin, Miastkowo, Rzekuń and Śniadowo.