Vitus Miletus (surname originally Möller) (1549 at Gmünd, Swabia – 11 September 1615 at Mainz) was a German Roman Catholic theologian.
He studied at the German College, Rome, from 1567 to 1575; on 28 October 1573, as dean of the students he gave a short address before Pope Gregory XIII, when he visited the newly organized academy.
He was ordained in St. John Lateran on Easter Saturday, 1575, and returned to Germany in the summer of that year; on his way home he was made doctor of theology at Bologna (11 June 1575).
He was summoned to Mainz by the Elector Daniel Brendel von Homburg, where he was active in the reform of the clergy.
His sermons on the doctrine of the Eucharist, preached at Erfurt in Lent, 1579, involved him in sharp controversy with the Protestant preachers.