Ali Pasha Mosque

Ali Pasha Mosque, Yakub Ağa Mosque or Ağa Mosque; a mosque in the Fatih district of Istanbul.

It was commissioned by Yakub Ağa, the former Palace Agha who died in 1547 or 1548. According to its inscription, the mosque, which appears to have been built in the 85th year after the Conquest of Istanbul, has a construction date of 1538. Because of damage from a fire, it was rebuilt in 1869 or 1870 by Grand Vizier Mehmed Emin Ali Pasha. The Istanbul Encyclopedia uses the phrase "Italian architect Bariori" for the mosque's architecture. Because of this phrase, some sources state that the mosque's architect was Giovanni Battista Barborini, but no document confirming this has been found. The building, damaged in the 1912 fire, began restoration in 1949 and was reopened for worship in 1953.

It is located in the Mercan neighbourhood at the intersection of Mercan Street and Fuatpaşa Street. The main worship area is circular inside and octagonal outside. The mosque's single minaret is single‑tiered, hanging, seven‑sided and has seven windows in its shaft.