Acacius of Beroea was a 4th-century Syrian bishop who resided in a monastery near Antioch. He gained prominence for his vigorous opposition to Arianism, which led to his appointment as Bishop of Beroea in 378 by Eusebius of Samosata. Throughout his career, he participated in significant ecclesiastical events, including the Council of Constantinople and various efforts to mediate disputes between different Christian factions and leaders.