Ferenc Dávid, Hungarian preacher, founder of the Unitarian Church of Transylvania (b. 1510)
Ferenc Dávid (also rendered as Francis David or Francis Davidis; born as Franz David Hertel, c. 1520 – 15 November 1579) was a Unitarian preacher from Transylvania, the founder of the Unitarian Church of Transylvania, and the leading figure of the Nontrinitarian movements during the Protestant Reformation.

Studying Catholic theology in Wittenberg and in Frankfurt an der Oder and first as a Catholic priest, later a Lutheran and then a Calvinist bishop in the Principality of Transylvania, he learnt the teachings and practices of the Roman Catholic and the Protestant churches, but later rejected several of them and came to embrace Unitarianism.

He disputed the Christian view on the Holy Trinity, believing God to be one and indivisible.