thumb|300px|[[Tetradrachm of Parthamaspates.]]
Parthamaspates was a Parthian prince who ruled as a Roman client king in Mesopotamia, and later of Osroene during the early second century AD. He was the son of the Parthian emperor Osroes I.
Biography
thumb|A kneeling Parthia presents Parthamaspates to Trajan
After spending much of his life in Roman exile, he accompanied the emperor Trajan on the latter's campaign to conquer Parthia. Trajan originally planned to annex Ctesiphon as part of the Roman Empire, but ultimately decided instead to place Parthamaspates on his father's throne as a Roman client, doing so in 116. Trajan effectively crowned Parthamaspates as a king of Parthia.
Following Roman withdrawal from the area, Osroes easily defeated Parthamaspates and reclaimed the Parthian throne.]]
From his territory of Osroene, he is known to have traded with the Kushan Empire, goods being sent by sea and through the Indus River.