Fatih is a municipality and district of Istanbul Province, Turkey. Its area is 15 km2, and its population is 368,227 (2022). It is home to almost all of the provincial authorities but not the courthouse. It encompasses the historical peninsula, coinciding with old Constantinople. In 2009, the district of Eminönü, which had been a separate municipality located at the tip of the peninsula, was once again remerged into Fatih because of its small population. Fatih is bordered by the Golden Horn to the north and the Sea of Marmara to the south, while the Western border is demarked by the Theodosian wall and the east by the Bosphorus Strait.

The Historic Areas of Istanbul are a group of sites in the capital district of Fatih in the city of Istanbul, Turkey. These areas were added to the UNESCO World Heritage List in 1985.