The Costești-Blidaru Dacian fortress is the ruin of a Dacian fortified town in present-day Romania. Located near Costești village in Hunedoara County, it belongs to the Dacian Fortresses of the Orăștie MountainsWorld 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.