Poșaga (German: Puschendorf; Hungarian: Podsága) is a commune located in Alba County, Transylvania, Romania.

It has a population of 835 as of 2021, and is composed of seven villages: Corțești, Incești (Jencsest), Lunca (Aranyoslonka), Orăști (Orest), Poșaga de Jos (the commune center; Alsópodsága), Poșaga de Sus (Felsőpodsága) and Săgagea (Szegázs).

The commune is situated in the Apuseni Mountains, between the Trascău Mountains and Muntele Mare [ro], at the confluence of the Poșaga and Arieș rivers.

The villages of Lunca and Poșaga de Jos are crossed by national road DN76 [ro]; Baia de Arieș is 23 km (14 mi) to the west and Turda is 40 km (25 mi) to the east.

Leon Șușman, the leader of an armed anti-communist resistance group from the 1950s, died in Poșaga de Sus in a shootout with Securitate troops in July 1957.