Pontus was a Hellenistic kingdom centered in the historical region of Pontus in modern-day Turkey, and ruled by the Mithridatic dynasty of Persian origin, which possibly may have been directly related to Darius the Great of the Achaemenid dynasty. The kingdom was proclaimed by Mithridates I in 281 BC and lasted until its conquest by the Roman Republic in 63 BC. The Kingdom of Pontus reached its largest extent under Mithridates VI the Great, who conquered Colchis, Cappadocia, Bithynia, the Greek colonies of the Tauric Chersonesos, and for a brief time the Roman province of Asia. After a long struggle with Rome in the Mithridatic Wars, Pontus was defeated.

Pontus or Pontos is a region on the southern coast of the Black Sea, located in the modern-day eastern Black Sea Region of Turkey. The name was applied to the coastal region and its mountainous hinterland by the Greeks who colonized the area in the Archaic period and derived from the Greek name of the Black Sea: Εύξεινος Πόντος (Eúxinos Póntos), "Hospitable Sea", or simply Pontos as early as the Aeschylean Persians and Herodotus' Histories.