The U.S. Embassy in Ankara and the Consulates in Istanbul and Adana are not permitted to perform authentications of official Turkish documents. To obtain an authentication, you may go to the governor’s office and receive an apostille certificate. You must have your document translated into English by a sworn translator and notarized by the Turkish notary before taking them for apostille certification. Apostille certificates (documents which have the special Hague Legalization Certificate) are acceptable in all countries where the Hague Treaty is in force (including Türkiye and the United States) without need for authentication by any other authority.
Apostille certification is obtainable at:
Ankara:
Ankara Valiliği, Hukuk İşleri Şube Müdürlüğü
Web-stie: http://www.ankara.gov.tr/hukuk-isleri-sube-mudurlugu
Istanbul:
Istanbul Valiliği, Hukuk İşleri Şube Müdürlüğü
Web-site: http://istanbul.gov.tr/hukuk-isleri-sube-mudurlugu
Adana:
Adana Valiliği, Hukuk İşleri Şube MüdürlüğüAdana
Web-site: http://adana.gov.tr/hukuk-isleri-sube-mudurlugu