Artaxias III, also known as Zeno-Artaxias, (Greek: Άρταξίας, 13 BC–34 AD) was a Pontic prince and later a Roman Client King of Armenia.

He was the first son and child born to Roman Client Rulers Polemon Pythodoros and Pythodorida of Pontus.

His paternal grandfather was Zenon, a prominent orator and aristocrat, who was an ally to Roman Triumvir Mark Antony.

Through his maternal grandmother he was a direct descendant of Mark Antony and his second wife Antonia Hybrida Minor.

He was succeeded by Arsaces I, one of the sons of King Artabanus III of Parthia.