Gmina Czarnia is a rural gmina (administrative district) in Ostroà ÂÃÂka County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Czarnia, which lies approximately north-west of Ostroà ÂÃÂka and north of Warsaw.
The gmina covers an area of , and as of 2006 its total population is 2,620 (2,756 in 2011).
Gmina Czarnia contains the villages and settlements of Bandysie, Brzozowy Kàt, Cupel, Cyk, Czarnia, Dà Âugie, Michaà Âowo, Rutkowo and Surowe.
Gmina Czarnia is bordered by the gminas of Baranowo, Chorzele, Myszyniec, Rozogi and Wielbark.