| Type: | town |
| County: | Alba |
| Leader Name: | Traian Pandor[1] |
| Leader Party: | PNL |
| Term: | 2020 - 2024 |
| Coordinates: | 46.3794°N 23.2797°W |
| Elevation: | 485 |
| Area Total: | 79.67 |
| Population Total: | auto |
| Postal Code: | 515300 |
| Area Code: | (+40) 02 58 |
Baia de Arieș (Hungarian: Aranyosbánya or Offenbánya; German: Offenburg) is a town in Alba County, Romania. It administers five villages: Brăzești (Berzesd), Cioara de Sus (Felsőcsóra), Muncelu (Muncsal), Sartăș (Szártos), and Simulești. With a population of 3,035 in 2021, it was until 2004 a mining centre extracting, mainly for base metals but also arsenopyrite and pyrite-rich concentrate containing gold.
The first writing about it is in a document of Charles I of Hungary since 1325. In the beginning of the 15th century it was declared free town. It lost town status later, but regained it in 1998.
Baia de Arieș's tourist objectives are the monument of nature tree known as the "Emperor's beech" and the Muncel Monastery.
At the 2021 census, Baia de Arieș had a population of 3,035. According to the census from 2011, the town had a total population of 3433; of those, 99.3% were ethnic Romanians, 0.55% ethnic Hungarians, and 0.19% ethnic Romani.[2]
Baia de Arieș has a warm-summer humid continental climate (Dfb in the Köppen climate classification).