Church of St Theodore, Byzantine church in Nesebar, Bulgaria.

The Church of St Theodore is a Byzantine stone structure located on Nesebar's peninsula along the Black Sea coast. The building displays typical features of 13th-century religious architecture with solid stone walls and a compact floor plan.

The church was built in the 13th century; its north and western façades survive from that period, while the other walls and the roof were added later. In the late Middle Ages the building was extended southward under the original gable roof, using broken stone instead of the earlier alternating white limestone blocks and black bricks. Today it houses an art gallery.

The church now houses an art gallery. Icons from its iconostasis are displayed in the icon hall of the new museum exhibition. The building is a medieval Orthodox church in Nesebar.

The church stands in Nesebar's old town on the peninsula, within the UNESCO-listed medieval core. The south side was extended in the late Middle Ages under the original gable roof, so look for the change from alternating white limestone and black brick to rubble stone. Inside, the building now houses an art gallery.

The earlier masonry alternates white limestone blocks with black bricks, while the later southward extension under the original gable roof was built of broken stones. Icons from the church's iconostasis survive and are displayed in the icon hall of the new museum exhibition.