Pfarrkirche St. Peter und Paul zu Karnburg, Parish church in Maria Saal, Austria.

The Pfarrkirche St. Peter und Paul zu Karnburg is a single-nave church with a recessed square choir and a 15th-century western porch tower topped by a pointed spire. Its walls incorporate Roman reliefs and inscriptions as spolia, and a wall encloses the church and cemetery. A south sacristy connects it to the Gothic Chapel of St. Anne, which has a small choir and a hipped roof with a stone ridge turret.

Built around 888 for a visit by King Arnulf of Carinthia, the church served as the chapel of a royal palace; because Arnulf held the imperial title from 896 to 899 it was also an imperial palace church, part of a fortification with walls, ramparts, ditches and palisades that no longer survives. It was first documented in 927 and was founded by the Salzburg bishops. Its Carolingian architecture makes it the oldest church in Carinthia.

The church is dedicated to Saints Peter and Paul, and its Baroque nave figures place Paul and Oswald on the north side and Peter and Sebastian on the south. A Gothic octagonal baptismal font stands in the cross-vaulted porch, and the Gothic Chapel of St Anne, linked through the south sacristy, holds figures of Anne with Mary, John Nepomuk and Francis Xavier.

The church stands at the foot of the Ulrichsberg on the Zollfeld, surrounded by a walled cemetery. The west tower of the 15th century, topped by a pointed spire, marks the entrance; the octagonal Gothic font stands in the cross-vaulted porch. The church is a protected monument, and the Roman stones are set visibly into the exterior walls.

The passage between the church and Anne's Chapel holds Roman reliefs showing a scribe and a servant, plus an inscription fragment with a Noric kymation. Roman gravestones of soldiers and locals are set into the church walls themselves, and the octagonal Gothic font stands in the vaulted porch.