Istanbul Governor's Office (Turkish: İstanbul Vilayet Konağı) is the seat of the governor of Istanbul province. It is located at Cağaloğlu quarter of Fatih district of Istanbul, Turkey. It was the headquarters of the Ottoman government, called the Sublime Porte, until the establishment of the Republic.
The Sublime Porte, also known as the Ottoman Porte or High Porte (Ottoman Turkish: باب عالی, romanized: Bâb-ı Âlî or Babıali; Turkish pronunciation: [baːbɯˈaːliː]), was a metonymy used to refer collectively to the central government of the Ottoman Empire in Istanbul. It is particularly referred to the building which housed the office of the Grand Vizier, Ministry of Foreign Affairs, Ministry of the Interior, and the Supreme Council of Judicial Ordinances. Today it houses the office of the Istanbul governerate.