Wallfahrtskirche Mariä Himmelfahrt, Catholic pilgrimage church in Ortenburg, Germany.

The Wallfahrtskirche Mariä Himmelfahrt in Sammarei, part of Ortenburg, is a baroque hall church with a polygonal choir and a facade tower. Builder Isaak Bader constructed it around a wooden chapel that predates 1521, which survives behind the high altar. About 1,300 votive pictures line the passage around this chapel, reached through two openings beneath the altar wings.

The church was built as a pilgrimage destination devoted to honoring the Assumption of Mary and reflects centuries of religious devotion in the region. Today it stands as a protected heritage monument in Bavaria, representing the evolution of local sacred architecture.

This pilgrimage site draws visitors who come to honor the Assumption of Mary through prayer and participation in religious ceremonies. The place remains a center for local devotion and community gatherings centered on Catholic traditions.

The church stands in Sammarei, a hamlet of Ortenburg in the Passau district. The main entrance is on the west side, where the Fountain of Gratitude stands on the forecourt. The wooden grace chapel inside is reached through two passages beneath the wings of the high altar; its interior can be seen through an iron grille from the nave.

The church is also called the Lower Bavarian Wieskirche, the Bavarian Assisi and the German Loreto. Its five-part altar wall of 1645, probably by Jakob Bendl, is judged unique in South German church furnishing; Bendl may have been influenced by Eastern Orthodox iconostases seen on a journey to Prague.