Etfal Hospital Clock Tower, or Children’s Hospital Clock Tower (Turkish: Etfal Hastanesi Saat Kulesi), is a clock tower situated in the garden of the Hamidiye Etfal Hospital (now Şişli Etfal Hospital) in the Şişli district of İstanbul, Turkey at the European side of Bosphorus. It was ordered by the Ottoman sultan Abdülhamid II (reigned 1876–1909) and constructed by the architect Mehmet Şükrü Bey.The 20 m (66 ft) tall structure is made of marble and fine Hereke stone.