Hacı I Giray (1397–1466) was the founder of the Crimean Khanate and the Giray dynasty of Crimea ruling from c. 1441 until his death in 1466. As the Golden Horde was breaking up, he established himself in Crimea and spent most of his life fighting off other warlords. He was usually allied with the Lithuanians. His name has many spellings, such as Haji-Girei and Melek Haji Girai (Crimean Tatar: Bır Hacı Geray, بیر-حاجى كراى; Melek Hacı Geray, ملک خاجى كراى).
He is said to have introduced the new state symbol, taraq tamğa, or "the trident of the Girays", which is derived from the scales insignia of the Golden Horde. A contemporary European source, The Chronicle of Dlugosz, described him as a person of outstanding personal values and an effective governor.