Church of Assumption of Mary in Mariánské Lázně, Byzantine church in Mariánské Lázně, Czech Republic.

The Church of Assumption of Mary stands in the middle of Goethova náměstí in Mariánské Lázně, an octagonal neo-Byzantine building designed by Munich architect Johann Gottfried Gutensohn and built by Anton Thurner and Josef Kranner in 1844–1848. Two towers with bells and clocks flank the west front, whose rose window shows Mary and the Christ Child; 33 steps lead up to the entrances, and statues of angels by Josef Max stand on the eight exterior pilasters.

The neo-Byzantine church was built in 1844–1848 on the site of a brick Chapel of the Nativity of the Virgin from 1820, demolished in 1848. Abbot Marian Josef Heinl of Teplá initiated it, with design by Munich architect Johann Gottfried Gutensohn and builders Anton Thurner and Josef Kranner. It was consecrated in 1850 by Archbishop Bedřich Schwarzenberg.

The side altar of Our Lady of Częstochowa holds a copy of the Black Madonna made in 1891, donated by Polish spa doctor Sigismund von Dobieszewski, who edited the medical journal Klinika here. It recalls the many Polish patients who came to the spa in the late 19th century.

The church stands in the middle of Goethe Square, reached by a flight of 33 steps; three landings mark Christ's three falls on the way to Golgotha. The south portal is permanently closed, so enter through the west or north door. The blue vault with its stars is best seen in daylight.

The floor mosaic forms four large letters M for "Maria, Mater Messiae Mundi", radiating to the four cardinal points and returning to a central square with a circle, a symbol of the eternal God. The 33 entrance steps stand for Christ's age, and the three landings recall his three falls on the way to Golgotha.