Gmina Mielnik is a rural gmina (administrative district) in Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland, on the border with Belarus. Its seat is the village of Mielnik, which lies approximately 17 kilometres (11 mi) south-east of Siemiatycze and 88 km (55 mi) south of the regional capital Białystok.
|Coordinates (Mielnik): Coordinates:|
|• Total||196.24 km2 (75.77 sq mi)|
|• Density||14/km2 (36/sq mi)|
The gmina covers an area of 196.24 square kilometres (75.8 sq mi), and as of 2006 its total population is 2,696.
Gmina Mielnik contains the villages and settlements of Adamowo-Zastawa, Grabowiec, Homoty, Końskie Góry, Koterka, Kudlicze, Maćkowicze, Mętna, Mielnik, Moszczona Królewska, Niemirów, Oksiutycze, Osłowo, Pawłowicze, Poręby, Radziwiłłówka, Sutno, Tokary, Wajków and Wilanowo.