Poiana Vadului (until 1968 Neagra; Hungarian: Feketevölgy) is a commune located in Alba County, Transylvania, Romania. It has a population of 942 as of 2021, and is composed of eleven villages: Costești, Duduieni, Făgetu de Jos, Făgetu de Sus, Hănășești, Lupăiești, Morcănești, Păștești, Petelei, Poiana Vadului, and Stănești.

The commune is located in the northwestern corner of the county, in the Bihor Mountains; it is a starting point for ascending the Cucurbăta Mare peak, which is, at 1,849 m (6,066 ft), the highest peak in the Apuseni Mountains range. Situated in the Țara Moților ethnogeographical region, Poiana Vadului lies at a distance of 19 km (12 mi) from Câmpeni and 98 km (61 mi) from the county seat, Alba Iulia.