The Eyüp Sultan Mosque is in the Eyüp district of Istanbul, outside the city walls and near the Golden Horn. The mosque complex includes a mausoleum marking the spot where Ebu Eyüp el-Ansari, the standard-bearer and companion of the Islamic prophet Muhammad, is said to have been buried. On a much older site, the present building dates from the beginning of the 19th century.

Eyüpsultan or Eyüp is a municipality and district of Istanbul Province, Turkey. Its area is 228 km2, and its population is 422,913 (2022). The district extends from the Golden Horn all the way to the shore of the Black Sea. Eyüp is also the name of a prominent neighborhood and former village in the district, located at the confluence of the Kâğıthane and Alibey streams at the head of the Golden Horn. The Eyüp neighborhood is a historically important area, especially for Turkish Muslims, due to the presence of the tomb of Abu Ayyub al-Ansari, the prominent Medinan companion (Ansar) and standard-bearer of the Islamic prophet Muhammad.