Erenköy Girls High School is a public girls high school in the Erenköy neighborhood of Kadıköy district in Istanbul, Turkey. Founded in 1911 during the Ottoman Empire, it is the oldest surviving girls high school in the country and the only girls high school in Istanbul.

Kadıköy is a municipality and district on the Asian side of Istanbul Province, Turkey. Its area is 25 km2, and its population is 467,919 (2023). It is a large and populous area in the Asian side of Istanbul, on the northern shore of the Sea of Marmara. It partially faces the historic city centre of Fatih on the European side of the Bosporus. It is bordered by the districts of Üsküdar, to the northwest, Ataşehir, to the northeast, and Maltepe, to the southeast.