| Costești-Cetățuie Dacian fortress | |
| Native Name: | Cetatea Dacică Costești-Cetățuie |
| Native Name Lang: | Romanian |
| Map Type: | Romania |
| Altitude M: | 514 |
| Relief: | Mountain Hilltop |
| Coordinates: | 45.6802°N 23.1543°W |
| Location: | Cetățuie, Costești, Hunedoara, Romania |
| Area: | Hunedoara County |
| Built: | 1st century BC |
| Abandoned: | 2nd century AD |
| Cultures: | Dacian |
| Event: | Trajan's Dacian Wars |
| Condition: | Ruined |
| Designation1: | World Heritage Site |
| Designation1 Number: | 906 |
| Designation2: | Monument istoric |
| Designation2 Number: | HD-I-s-A-03177 [1] |
The Costești-Cetățuie Dacian fortress was a Dacian fortified town. Located near Costești village, Hunedoara County, Romania, it belongs to the Dacian Fortresses of the Orăștie Mountains World Heritage Site. The fortress was built in the 1st century BC, during Burebista's rule, with the purpose of defending the area against the Romans.
The site is located in the river valley of Apa Grădiștei. The superior plateau of the hill where it is situated is 514 m above sea level. It was a strong fortress which had a defensive role. Apparently, it had a civilian settlement at the base and it was the regular residence of the Dacian kings. Another important role was the guarding of the road to Sarmizegetusa Regia.