Tiridates III (250-330) is the king of Arsacid Armenia (287-330), and is also known as Tiridates the Great; some scholars incorrectly refer to him as Tiridates IV as a result of the fact that Tiridates I of Armenia reigned twice).

In 301, Tiridates proclaims Christianity as the state religion of Armenia, making the Armenian kingdom the first state to embrace Christianity officially.