Church of the Assumption of the Virgin Mary, Gothic church in Ústí nad Labem, Czech Republic.

The Church of the Assumption of the Virgin Mary is a Gothic hall church with three naves, pale yellow plaster walls and dark stone trim. A 65-metre tower with a steep green spire and four corner turrets stands on the west side, and tall pointed windows with stone tracery line the body.

Construction of the present church began around 1318 on the site of an earlier Romanesque building, with German colonists starting the presbytery, vaulted in 1380. Hussites sacked the nave and tower in 1426, and rebuilding lasted from 1452 to 1530. Josef Mocker and then Anton Weber gave it its neo-Gothic form between 1897 and 1901, and a 17 April 1945 air raid cracked and tilted the tower.

The church is dedicated to the Assumption of the Virgin Mary and belongs to the Roman Catholic Archdeaconry. Its tower, at 65 metres, is the dominant feature of Ústí nad Labem. Since 1995 a forged sculpture by Karel Ondřej Hájek has stood before the entrance.

Visitors can view the church during regular opening times or arrange a private visit by contacting the local administration office in advance. It helps to check ahead since access may be restricted during religious services or special events.

The tower leans 200.9 cm from the vertical, measured by architect Zdeněk Havlík in 2008, which places it fourth among the world's leaning towers behind Pisa. A brass plaque set in front of the church on 11 March 2019 marks the deviation.