Agapius may refer to:
- Saint Agapius of Spain (d. 259), Christian martyr, died at Citra
- Saint Agapius of Palestine (d. 303/304) Christian martyr, beheaded along with many others under Great Persecution of Diocletian
- Agapius of Edessa (d. 304) Christian martyr and one of three sons of St. Bassa
- Saint Agapius of Caesarea (d. 306), Christian martyr, drowned in Caesarea
- Agapius of Caesarea (d. c 312), bishop of Caesarea, predecessor to Eusebius
- Agapius (soldier), (d. 315), Christian martyr and soldier, burned with Carterius and others in Armenia
- Agapius of Novara, (d. 447) Bishop of Novara, Piedmont, Italy for over 30 years
- Agapius (Manichaean), (4th or 5th century) Manichaean philosopher and possible disciple of Mani
- Agapius (physician), (5th century) ancient physician from Alexandria
- Agapius (philosopher), (5th-6th century) Neoplatonist philosopher
- Agapius the historian, (10th century) Arabic Christian bishop of Manbij (Hierapolis), near Aleppo
- Agapius, a companion of Saint Aphrodisius
- Saint Martyr Agapius from Galatista (Macedonia) (1710–1752)
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