The Parsii were a nomadic tribe, in the district of Paropamisadae in Bactria near the Hindu Kush ranges in northern Afghanistan during antiquity. They lived on the Oxus River, centered on the city of Parsiia.
During the Hellenistic and Persian Empires they lived in the satrapy of the Paropanisadai.
They are mentioned in Claudius Ptolemaeus<ReF>Claudius Ptolemaeus, Geographia: gewidmet Kardinal Aloysius Cornelius, Volume 0 (Vincentius Valgrisius, 1562) page 236.</ref> and appear on map XI of that work, in the area north west of modern Kabul.
They came under the rule of Demetrius I of Bactria, who was ruling Greek Bactria from nearby Kupisa. until Eucratides I of the Indo-Greek Kingdom conquered the area.