Zeyrek is a neighborhood of Fatih district in Istanbul, Turkey. It overlooks the Golden Horn, and got its name from the Mosque of Zeyrek. It hosts also several Byzantine cisterns and the little Şeyh Süleyman Mosque, also of Byzantine origin. It is a picturesque but poor neighborhood.
The center of Zeyrek is on the World Heritage list as part of the Historic Areas of Istanbul, the World Heritage Site.