Church of Saint Nicholas in Frombork, Gothic church in Frombork, Poland.

The Church of Saint Nicholas is a Gothic brick building in Frombork characterized by buttresses at its corners and traditional masonry patterns throughout its walls. The structure displays typical Gothic features with its sturdy construction and straightforward layout designed for its religious functions.

The present Gothic brick church was built at the end of the 14th century. Fires damaged the interior in 1414, 1440 and 1454, and during the 1461 siege of Frombork the whole west facade collapsed with a row of pillars; rebuilding ran from 1461 to 1507. Damaged again in 1520 and destroyed in 1574, it was reconsecrated by Bishop Marcin Kromer on 5 August 1582.

The church is no longer a parish church; since its post-war reconstruction in 1972–1973 its interior served as the town boiler house until 2002, when the large chimney was removed from the roof. Inside, the nave is divided by octagonal pillars: the eastern ones are original, the western ones date from the early 16th century. In the western porch the original cross vault of 1691 survives.

The church stands in Frombork's old town, a short walk from the cathedral hill. It is no longer oriented: the west porch and east sacristy follow the building's rectangular plan rather than the compass. Look for the surviving cross-rib vault in the sacristy and the 1691 cross vault in the west porch.

From 1972 to 2002 the rebuilt interior served as the town boiler house, and a large chimney stood in the roof until 2002 on the site of a 1691 Baroque bell turret. The west porch keeps its original 1691 cross vault, while the sacristy shows traces of a 14th-century rib vault.