The Procathedral of Our Lady in Dublin is a neoclassical building that is the seat of the Archbishop of the Catholic Diocese of Dublin. It is a building that combines the features of ancient Greek and Roman architecture. It has a monumental column portico supporting a triangular tympanum. There is a dome above the presbytery.
The name pro-cathedral is used to describe the most important church for Dublin's Catholics for historical reasons. It is an expression of the expectation that the Protestant Church of Ireland will return the "real" Dublin Cathedral, that is, Saint Patrick's Cathedral. The pro-cathedral of the Virgin Mary is the church where the main state ceremonies are held.
The church was built in the years 1814-1825. It is a monumental structure on a cross plan, with a dome over the presbytery. It was built of stone. The façade is decorated with Doric columns and a frieze. Similar columns divide the interior of the church into naves. The colonnade also surrounds the presbytery. The floor is decorated with a mosaic with traditional Irish patterns.