Tigranes the Younger was an Artaxiad prince, who briefly ruled the Kingdom of Sophene in 65 BC.

[2] This marriage, which took place in 66/65 BC, gave Phraates III the opportunity to involve himself in the affairs of Armenia, including preventing the Roman commander Pompey from putting Parthian interests in jeopardy.

Initially successful, their efforts were halted by a long siege at Artaxata, which led Phraates III to put Tigranes the Younger in charge of the expedition, leaving him with some Parthian soldiers.

[6] Instead, Tigranes the Younger was made the ruler of Sophene with the assurance that he would ascend to the Armenian throne after his father's death.

According to M. Rahim Shayegan, it was because he remained an ally of Phraates III, with whom he still conspired with to overthrow Tigranes the Elder, whilst Michał Marciak states it was due to his dispute with Pompey over Sophene's treasury.