Saint Victorinus of Pettau (also Ptuj or Poetovio; Greek: Βικτωρίνος Πεταβίου; died 303 or 304) was an Early Christian ecclesiastical writer who flourished about 270, and who was martyred during the persecutions of Emperor Diocletian.

Born probably in Roman Greece on the confines of the Eastern and Western Empires or in Poetovio with rather mixed population, due to its military character, Victorinus spoke Greek better than Latin, which explains why, in St. Jerome's opinion, his works written in the latter tongue were more remarkable for their matter than for their style.

The only works of his that survived past antiquity, however, are his Commentary on the Apocalypse[3] and the short tract On the construction of the world (De fabrica mundi).

"[9] Johannes Quasten writes that "It seems that he did not give a running commentary on the entire text but contented himself with a paraphrase of selected passages.

"[10] Victorinus interpreted Revelation 20:4-6 quite literally in a millennialist (chiliastic) fashion: as a prophecy of a forthcoming rule of the just in an Earthly paradise.

Victorinus sees the four animals singing praise to God as the Gospels, and the 24 elders seated on thrones in Revelation 4 are the 12 patriarchs of the 12 tribes of Israel and the 12 apostles.