| Atanas Fortress | |
| Location Town: | Krupac, Pirot |
| Location Country: | Serbia  |
| Style: | Fortification, mixed |
Atanas is a fortress in Serbia. It is located 8 km southeast from Pirot, near the village Krupac. It was an ancient settlement in the area in the 6th century BC.[1] Today remains of the keep can be seen.[2]