Arius (disambiguation)

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
• Arius, a long-running line of digital pianos created by the Yamaha
• Podocarpus costalis, species of plants native to the Philippines and Taiwan