Pantanassa Monastery, Byzantine monastery in Mystras, Greece.

Pantanassa Monastery is a Byzantine religious structure built on a hillside in Mystras, featuring stone walls, decorative bell towers, and curved domes built into the roofline. The buildings display the architectural style typical of the region during the 15th century.

Giannis Frankopoulos, a chief minister of the Despotate of the Morea, founded the monastery, and it was dedicated in September 1428. It was the last church built at Mystras, below the walls of the upper town, and it is the best-preserved monument on the site. Its four-storey bell tower shows strong Frankish influence.

The interior walls display religious paintings created by artists who brought fresh approaches to how light and color illuminate Orthodox subjects. These works remain central to how visitors experience the space today.

The monastery is home to nuns who maintain daily religious life and offer tours to visitors. Walking through requires respectful behavior and appropriate clothing since it remains an active place of worship.

This is the only continuously inhabited religious structure within the entire archaeological site of Mystras since its founding. This unbroken occupation sets it apart from every other building on the site.