The Reformed Great Church or Great Reformed Church in Debrecen (Hungarian: Nagytemplom) is located in the city of Debrecen. It stands in the city centre, between Kossuth square and Calvin square. It is the symbol of the Protestant Church in Hungary, and it is because of this church that Debrecen is sometimes referred to as "the Calvinist Rome". With a ground space of 1500 m² it is the largest Protestant church in Hungary. It also has the largest bell of all Hungarian Protestant churches.