Dashtadem Fortress is a substantial fortress of the 10th to 19th centuries located at the southern outskirts of Dashtadem village in the Aragatsotn Province of Armenia.

An octagonal walled enceinte surrounds the fortress and was constructed during the beginning of the 19th century. A continuous line of eight bastions and curtain walls encloses interior fortifications; seven regular polygonal bastions and a single semi-circular or “half-moon” bastion to the north. Five of the ten original semi-circular bastions remain standing. The keep consists of four semi-circular towers that were affixed at a later date to earlier 10th-century Armenian fortifications. Beneath the towers are large cisterns and tunnels that lead to the top of the keep. The structure has been partially renovated in recent years, while the chapel has been entirely rebuilt. The fortress became the largest within the territory of the Republic of Armenia.