Cathedral Basilica of the Assumption of the Blessed Virgin Mary, Białystok

The Cathedral Basilica of the Assumption of the Blessed Virgin Mary also called Białystok Cathedral is a Roman Catholic cathedral in the city of Bialystok in Poland. It was designed by architect Józef Pius Dziekoński. The three-nave church is 90 meters long and can accommodate 9,500 worshipers. The two towers reach 72.5 meters high. It is the main church of the Archdiocese of Bialystok and acquired the status of basílica in 1985 by decision of Pope John Paul II.

The predecessor of the present cathedral was a Renaissance church was built between 1617 and 1626. In the late 19th century, the number of parishioners had grown to 12,000 people, while the old church was only room for 1,000 worshipers. The Catholics under Czarist Russia were not allowed to build a new church.