Little Hagia Sophia (Turkish: Küçük Ayasofya Camii), formerly the Church of the Saints Sergius and Bacchus (Greek: Ἐκκλησία τῶν Ἁγίων Σεργίου καὶ Βάκχου ἐν τοῖς Ὁρμίσδου, Ekklēsía tôn Hagíōs Sergíou kaì Bákchou en toês Hormísdou), is a former Eastern Orthodox church dedicated to Saints Sergius and Bacchus in Constantinople, converted into a mosque during the Ottoman Empire.