Khadjibey (Turkish: Hacıbey) was a fortress and a haven by the Gulf of Odessa, in the location of the modern city of Odessa, Ukraine. Other known spellings include Khadzhibey, Khadjibei, Hajibey, Khacdjibei, Hacıbey, Hocabey, Gadzhibei, Chadžibėjus, Hacıbey, Codjabey, Kachybey, Kotsiubey, Kotsiubiiv. Named after Hacı I Giray.
A Tatar settlement existed on the site by 14th century but was ceded in the early 15th century to the Polish–Lithuanian Commonwealth; in 1480 the fortress was captured by the Ottoman Empire. In 1764 the Ottomans reinforced their position by building the Yeni Dünya fortress nearby; it was included in the province of Silistra Eyalet. In 1789, during the Russo-Turkish War, the Russian army took the fortress and settlement and in 1792 and the territory was transferred to the Russian Empire