The Unitarian Church of Transylvania, also known as the Hungarian Unitarian Church, is a Nontrinitarian Christian denomination of the Unitarian tradition, based in the city of Cluj, Transylvania, Romania. Founded in 1568 in the Eastern Hungarian Kingdom by the Unitarian preacher and theologian Ferenc Dávid, it is the oldest continuing Unitarian denomination in the world. It has a majority-Hungarian following, and is one of the 18 religious denominations given official recognition by the Government of Romania.

The ecclesiastical title of archpriest or archpresbyter belongs to certain priests with supervisory duties over a number of parishes. The term is most often used in Eastern Orthodoxy and the Eastern Catholic Churches and may be somewhat analogous to a monsignor, vicar forane or dean in the Latin Church, but in the Eastern churches an archpriest wears an additional vestment and, typically, a pectoral cross, and becomes an archpriest via a liturgical ceremony.