The Reformed Great Church or Great Reformed Church in Debrecen (Hungarian: debreceni református nagytemplom) is located in the city of Debrecen, between Kossuth Square and Kálvin Square. An icon of Protestantism in Hungary, the church has earned the city the nickname "the Calvinist Rome". With a floor area of 1,500 m2 it is the largest Protestant church structure in Hungary, and also has the largest bell of all Hungarian Protestant churches. The Great Church was built between 1805 and 1824 in the neoclassical style.