The Cağaloğlu Hamam is a historic hamam (Turkish bathhouse) in Istanbul, Turkey. Finished in 1741, it is one of the last major hamams to be built in Istanbul during the Ottoman period. It was built in Eminönü, in Alemdar, on Hilal-i Ahmer street as a public hamam to raise revenue for the library of Sultan Mahmud I situated inside the Ayasofya. It was begun by one of the head architects of that time, Suleyman Ağa, and finished by Abdullah Ağa. The structure consists of a double hamam: a bathhouse for men and another for women. The layout follows the long-established traditional form of hammams, though the architectural details and decoration are in the later Ottoman Baroque style of the 18th century.