Arius was a Christian priest in Alexandria, Egypt in the early fourth century.
Arius may also refer to:
Arius (fish), a genus of catfishes Arius Didymus, a citizen of Alexandria Hari River, a river known in Latin as the Arius Podocarpus costalis, species of plants native to the Philippines and Taiwan
See also Arian (disambiguation) Arianus (disambiguation) Arrianus (disambiguation) Arianism