Kumkapñ () is a quarter in Fatih district of Istanbul. It is located along the northern shore of Marmara Sea. Up to recent times, Kumkapñ is the center of the Armenian community of the city, boasting a school and several churches. It is also where the seat of the Armenian Patriarchate of Constantinople is located. The quarter is famous for its many fish restaurants; therefore attracting many local and foreign tourists round the year.
In the Byzantine period, the area was known in Greek as KontoskÃÂ lion.
During the British bombing of ðstanbul, the area was damaged in 18 October 1918.
Kumkapñ used to be served by a station on the Sirkeci suburban until 2013, when the station was indefinitely closed as a part of the Marmaray project. The Kumkapñ station is now served by the T6 line inaugurated in February 2024. Kumkapñ is also easily accessible by sea.