St Nicolas Church of Piraeus, Greek Orthodox church near the harbor in Piraeus, Greece.

St Nicolas Church is a cross-in-square church with four columns, built in a neoclassical style by Ioannis Lazarimos between 1879 and 1902. Its three monumental porticoes on the west, north and south facades resemble ancient Corinthian temples, and the marble came from Mount Hymettus and Carrara.

The first church, designed by municipal architect C. Lorenzen in 1839, was inaugurated on 23 July 1844, with one hundred Hydriot families covering the completion costs. Because it proved too small, municipal engineer N. Petimezas redesigned the building in 1851 and construction of a larger church began in 1852. The present church was founded in 1879 by Ioannis Lazarimos, built between 1881 and 1890, and completed in 1902 with help from municipal architect Georgios Zizilas.

The church is named for Saint Nicholas, patron of seafarers, fitting for a building at the port of Piraeus. Its first version was inaugurated on 23 July 1844, after the mayor ruled the church belonged to the municipality and one hundred Hydriot families had to cover the completion costs.

The church stands at the port of Piraeus, with a new entrance and staircase added toward the sea side in the late 1850s. Approach it on foot from the waterfront; the surrounding streets are busy with harbor traffic, so daytime visits are easier. Look for the three monumental porches on the west, north and south facades.

The 1852 building budget specified a dome 19 metres in circumference and 9 metres high above the central square, with a pronaos on six marble columns and two bell towers of carved Hymettus marble. The present church, founded in 1879, replaced that structure.