The Reformed Church in Romania (Hungarian: Romániai Református Egyház; Romanian: Biserica Reformată din România) is a Calvinist denomination and the largest Protestant church in Romania.

The large majority of the Church's parishes are in Transylvania; according to the 2021 census, 495,380 people or 2.6% of the total population belong to the Reformed Church.

[2][3] The religious institution is composed of two bishoprics, the Reformed Diocese of Királyhágómellék and the Reformed Diocese of Transylvania.

Together with the Unitarian Church of Transylvania and the two Lutheran churches of Romania (the Evangelical Lutheran Church in Romania and the Evangelical Church of Augustan Confession), the Calvinist community runs the Protestant Theological Institute of Cluj.

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