The Nuruosmaniye Mosque (Turkish: Nuruosmaniye Camii) is an Ottoman mosque located in the Çemberlitaş neighbourhood of Fatih district in Istanbul, Turkey. It is considered one of the finest examples of mosques in Ottoman Baroque style. It was built by architects Mustafa Ağa and Simon Kalfa from the order of Sultan Mahmut I and completed by his brother and successor Sultan Osman III. The architects adopted Baroque architectural elements, the mosque is also distinctive with the absence of an ablution fountain (Turkish: şadırvan). Nuruosmaniye Mosque is located near the entrance to the Kapalıçarşı (Grand Bazaar), Column of Constantine and the historical Atik Ali Paşa Mosque.