|Ahırkapı Lighthouse seen from Marmara Sea.|
|Location||Ahırkapı, Fatih, Istanbul, Turkey|
|Year first constructed||1755 (1857)|
|Markings / pattern||White with one narrow black horizontal band|
|Height||26 m (85 ft)|
|Focal height||36 m (118 ft)|
|Current lens||500mm catadioptric cylindrical lenses|
|Range||16 nmi (30 km)|
|Characteristic||White flashing every 6 seconds|
The Ahırkap Feneri, a historical lighthouse still in use, is located at the southern Seraglio Point on the Rumelian coast of Bosporus' south entrance, in Ahırkapı neighborhood of Istanbul's Fatih district, Turkey. It is across from the Kadıköy İnciburnu Feneri, which is on the Anatolian coast of the strait at a distance of 1.5 nmi (2.8 km). A line connecting the two lighthouses marks the southern boundary of the Port of Istanbul.
It is told that a marine accident, which occurred near this location, led to the establishment of the lighthouse. In 1755, a merchant sail ship bound for Egypt run aground off the shore of Kumkapı due to bad weather conditions in the night. Heard of the ship grounding, Ottoman sultan Osman III (reigned 1754–1757) rushed to the scene, where a seaman complained about the lack of a lighthouse there that could provide safe navigation around the hazardous waters. On the sultan's order, a light fueled by olive oil was established by the Kapudan Pasha atop a watchtower of the city's walls at this location.
In 1857, Sultan Abdülmecid I (reigned 1839–1861) commissioned the building of a lighthouse, which was constructed by French engineers in Ahırkapı (literally English: Stable Gate) right outside of the city walls south of the Topkapı Palace.
Initially, the lighthouse was lit by kerosene, however the light source was later replaced by Dalén light using carbide (acetylene gas). Finally, it was electrified. The lighthouse's lantern has a 500mm catadioptric cylindrical lens and a 1,000 W lamp. At a focal height of 36 m (118 ft), it flashes white every 6 seconds, which is visible at a range of 16 nmi (30 km) in the Sea of Marmara.
Ahırkapı Feneri is listed in Turkey under the code "TUR-056" and its radio call sign is TC1ALH. It is operated and maintained by the Coastal Safety Authority (Turkish: Kıyı Emniyeti Genel Müdürlüğü) of the Ministry of Transport and Communication.
- Rowlett, Russ. "Lighthouses of Northwestern Turkey". The Lighthouse Directory. University of North Carolina at Chapel Hill. Retrieved 2010-09-18.
- "Historical Lighthouses-Ahırkapı Lighthouse". Ministry of Transport-Directorate General of Coastal Safety. Retrieved 2010-09-18.
- "Istanbul Lighthouses On The Air (ILOTA) Award by TCSWAT". TCSWAT. Retrieved 2010-09-18.
- "Türk Boğazları ve Marmara Denizi'nin Coğrafi Konumu-İstanbul Boğazı" (in Turkish). Denizcilik. Retrieved 2010-09-18.