Vefa is a neighborhood in Istanbul, Turkey. It is part of the district of Fatih and managed as borough of Mollahüsrev, inside the walled city. It belonged to the district of Eminönü between 1928 and 2008. It lies roughly northwest of the eastern section of the Aqueduct of Valens, and is rich of monuments, both Byzantine, like the mosques of Kalenderhane and Vefa Kilise, and Ottoman, like the Süleymaniye Mosque.