Agapius (Ancient Greek: Ἀγάπιος) was a Christian martyr killed at Caesarea in AD 306.

His martyrdom is recorded by Eusebius of Caesarea in his work The Martyrs of Palestine.

Agapius succeeded Theotecnus as bishop of Caesarea Maritima.

The judges, Eusebius notes, must have been motivated either out of compassion or the hope that he might change his mind and renounce Christianity.

According to Eusebius, he not only refused the offer, but he is said to have cheerfully rushed headlong into the bear.