Mangup (Ukrainian: Мангуп, Russian: Мангуп, Crimean Tatar: Mangup) also known as Mangup Kale is a historic fortress in Crimea, located on a plateau about 9 miles due east of Sevastopol (ancient Chersones). In medieval times it was known as Doros, later it was given the Kipchak name Mangup (kale means fortress).

The settlement dates back to the 3rd century CE and was fortified by Justinian I in the mid 6th century. It was inhabited and governed primarily by Crimean Goths, and became the center of their autonomous principality. It was conquered by the Khazars in the early 8th century and was the center of an unsuccessful Gothic revolt against Khazaria led by Bishop John of Gothia.

The principality of Doros was under Byzantine domination from the mid 9th century to approximately 1000, when it fell under the influence of competing powers - Kievan Rus and the Kipchak tribal confederacy. The town was severely damaged by an earthquake in the 11th century., yet managed to maintain autonomy during the Mongol conquest of Crimea but was compelled to pay tribute to the Great Khan.