The Reformed Christian Church in Slovakia (Slovak: Reformovaná kresťanská cirkev na Slovensku, Hungarian: Szlovákiai Református Keresztény Egyház) has 85,000 members in 205 parishes and 103 mission churches and 59 house fellowships in 9 presbyteries.
The members are mostly Hungarians living in the southern part of the country, and it has a shared history with the Reformed Church in Hungary.
[1] Before World War I, these congregations were part of the Reformed Church in Hungary.
During the Counter Reformation, the princes of Transylvania protected the Calvinist faith and extended their supremacy to this part of Hungary.
[4][1] There are 9 presbyteries in the denomination, the Pozsonyi, Komáromi, Barsi, Gömöri, Abaújtornai, Zempléni, Ungi, Michalovský (Nagymihályi), Ondavsko-Hornádský (Ondava-Hernádi) Presbyteries, and there are several mission congregations,[5] like the Hungarian Reformed Church in Prague.