The Fortress of Deva is a medieval castle located in the city of Deva, in the Hunedoara County of Romania. The castle was built in the 13th century by Hungarian king Bela IV, and it was initially used as a military fortress to defend against Tatar invasions.

The castle is located on a hilltop overlooking the city of Deva, and it is accessible by a cable car or by foot via a winding path. Visitors can explore the castle's fortified walls, towers, and gates, which have been restored and renovated over the years. The castle also houses a museum with exhibits on the history of the castle and the surrounding region.

The fortress of Deva has a rich history, having been occupied by various armies and rulers over the centuries, including the Habsburgs, the Ottomans, and the Austro-Hungarian Empire. During the 18th century, the castle was used as a prison for political prisoners. Today, the castle is a popular tourist attraction and a symbol of the city's history and heritage.