Ferenc Dávid was a Protestant preacher and theologian from Transylvania, the founder of the Unitarian Church of Transylvania, and the leading figure of the Nontrinitarian Christian movements during the Protestant Reformation. He disputed the mainstream Christian doctrine of the Trinity, believing God to be one and indivisible.

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.