Gmina Poświętne is a rural gmina (administrative district) in Białystok County, Podlaskie Voivodeship, in north-eastern Poland. Its seat is the village of Poświętne, which lies approximately 32 kilometres (20 mi) south-west of the regional capital Białystok.

The gmina covers an area of 114.33 square kilometres (44.1 sq mi), and as of 2006 its total population is 3,761.

Gmina Poświętne contains the villages and settlements of Bielsk Podlaski, Brzozowo Stare, Brzozowo-Antonie, Brzozowo-Chabdy, Brzozowo-Chrzczonki, Brzozowo-Chrzczony, Brzozowo-Korabie, Brzozowo-Muzyły, Brzozowo-Panki, Brzozowo-Solniki, Chomizna, Dzierżki, Dzierżki-Ząbki, Gabrysin, Gołębie, Grochy, Józefin, Kamińskie Jaski, Kamińskie Ocioski, Kamińskie Pliszki, Kamińskie Wiktory, Kuran, Liza Nowa, Liza Stara, Łukawica, Marynki, Ostrów, Pietkowo, Pietkowo Drugie, Porośl-Głuchy, Porośl-Wojsławy, Stoczek, Turek, Wilkowo Nowe, Wilkowo Stare, Wołkuny, Zdrody Nowe and Zdrody Stare.

Gmina Poświętne is bordered by the gminy of Brańsk, Łapy, Nowe Piekuty, Sokoły, Suraż and Wyszki.

• Polish official population figures 2006