| Type: | commune |
| County: | Alba |
| Poșaga | |
| Leader Name: | Ionel Bulgăr |
| Leader Party: | PNL |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 46.4667°N 46°W |
| Elevation: | 455 |
| Area Total: | 136.28 |
| Population Total: | auto |
| Postal Code: | 517575 |
| Area Code: | +40 x58 |
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, at the confluence of the Poșaga and Arieș rivers. It is located in the northern part of the county, on the border with Cluj County. The villages of Lunca and Poșaga de Jos are crossed by national road ; Baia de Arieș is to the west and Turda is to the east. The is a protected area along the river Poșaga, between Poșaga de Jos and Poșaga de Sus.
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.