Panagia Marmariotissa church, Eastern Orthodox church in Chalandri, Greece

Panagia Marmariotissa is a small Eastern Orthodox church in Chalandri, formed from a Roman-era mausoleum. Its floor lies several metres below street level, the entrance is on the west, and the interior is covered by a semi-cylindrical barrel vault of marble voussoirs. The sanctuary occupies the semi-hexagonal east end where the ancient entrance once stood.

The building began as a Roman mausoleum in ancient times and was later converted into an Orthodox church. This transformation shows how ancient structures were repurposed for new religious purposes over the centuries.

The name Marmariotissa refers to the marble of the building, a Roman mausoleum later turned into a church. Inside, fragments of 17th-century wall paintings survive, and Anastasios Orlandos noted an inscription on them giving the year 1717. The small church has a semi-hexagonal sanctuary where the ancient entrance once stood.

The church stands at the corner of Panagias Marmariotissis and Sofokli Venizelou streets, set behind the newer church of the same name, so look for the low structure rather than the modern facade. Its floor lies a few metres below today's ground level, and the entrance is now on the west side, where the original Roman doorway was on the east.

The name Marmariotissa comes from the marble used in construction, reflecting the wealth of its original builder from the ancient Phlya region. This choice of name was a way in ancient times to convey importance and prosperity through material selection.