Arkas may refer to one of the following:

• Arkas (comics), the Greek comics artist
• Arcas, the son of Zeus and Kallisto
• Arkas (planet) or HD 81688 b, an exoplanet
• Arkas, Republic of Dagestan, a rural locality in Dagestan, Russia
• Arkas Spor, professional volleyball team based in Izmir, Turkey
• Arkas Container Transport, a Turkish shipping line
• Mykola Arkas (1853–1909), Ukrainian composer, writer, and historian