Saint Apollonius (Ancient Greek: Ἀπολλώνιος) was a Christian of ancient Rome who was executed in the 2nd century AD, during the reign of the Roman emperor Commodus. He is said to have been a Roman senator. At his trial he mounted a defense of Christianity in the Roman senate, which was afterwards translated into Greek and inserted by church historian Eusebius in his history of the Christian martyrs, but is now lost.^[1][2]

He is the same as Saint Apollonius the Apologist.

Nicephorus I of Constantinople confuses this Apollonius with Apollonius, bishop of Ephesus who wrote against the Cataphryges.^[3][4][5]