The Church of the Assumption of the Blessed Virgin Mary (Polish: Kościół Wniebowzięcia Najświętszej Marii Panny), known colloquially as the St. Mary's Church (Polish: Kościół Mariacki), is a historic Roman Catholic parish church located at Mariacki Square at the north-eastern corner of the Main Market Square in the Old Town of Kraków, Poland.
It is a Brick Gothic church. Built in the 14th century, its foundations date back to the early 13th century and serve as one of the best examples of Polish Gothic architecture. Standing 80 m (262 ft) tall, it is particularly famous for its wooden altarpiece carved by Veit Stoss (Wit Stwosz). Some of its monumental polychrome murals were designed by Poland's leading history painter, Jan Matejko (1838–1893). In 1978, it became a UNESCO World Heritage Site alongside the Historic Centre of Kraków.