Acacius is a masculine given name which may refer to:
Saints Acathius of Melitene (died c. 251), Bishop of Melitene, venerated by the Eastern Orthodox Church Agathius, also known as Acacius of Byzantium (died 303), martyred Cappadocian Greek centurion of the imperial army An early Church of St Acacius existed at Constantinople, possibly connected with this martyr. Acacius of Sebaste (died c. 304), Armenian priest Acacius (died 320), Roman soldier and one of the Forty Martyrs of Sebaste Acacius of Amida, Bishop of Amida, Mesopotamia (400–425) Acacius of Constantinople (died 489), Ecumenical Patriarch of Constantinople, Oriental Orthodox saint engaged in the Christological controversy Saint Acacius, leader of the Ten thousand martyrs (Roman soldiers who converted to Christianity and were crucified in Armenia), according to medieval legend Acacius the Younger (died 1730), Greek Orthodox monk who lived on Mount Athos
Other uses Acacius the grammarian from Caesarea; friend of Libanius (314–394) Acacius of Caesarea (d. 366), a.k.a. "the One-Eyed", bishop in Caesarea, opponent of St. Cyril of Jerusalem Acacius of Beroea (d. 437), Syrian bishop Acacius of Seleucia-Ctesiphon (d. 496), Patriarch of the Church of the East Acacius, father of Theodora (6th century) (500–548), empress of the Byzantine Empire Acacius (proconsul), Byzantine proconsul of Armenia Prima (First Armenia), c. 536-539 Acacius (Alexandria), Byzantine military officer in Alexandria, c. 539-540 Acacius (curator), Byzantine imperial curator in the 560s Acacius (son of Archelaus), Byzantine imperial representative, active c. 573
See also Acacia (disambiguation)