Saint Sophia Cathedral, located in Sophia Square, Daoli District, Harbin City, Heilongjiang Province, China, is a Byzantine-style Orthodox church built in 1907. It is a landmark building in Harbin. In 1986, the People's Government of Harbin listed it as class I protection building, and it was selected in the list of the fourth batch of national key cultural relics protection units with the approval of the State Council in 1996. The interior of St. Sophia Cathedral is now used as the Museum of Architectural Art in Harbin.