Osroes I (Parthian: 𐭇𐭅𐭎𐭓𐭅, Khusraw) was a prince of Iranian and Greek ancestry. He ruled the Parthian Empire from 109 to 129, with a brief interruption from 116 to 117. He succeeded his brother Pacorus II. For the whole of his reign he contended with the rival King Vologases III based in the East of Parthia.