The Column of Constantine (Turkish: Çemberlitaş Sütunu; Greek: Στήλη του Κωνσταντίνου Α΄; Latin: Columna Constantini) is a monumental column commemorating the dedication of Constantinople by Roman emperor Constantine the Great on 11 May 330 AD. Completed c. 328 AD, it is the oldest Constantinian monument to survive in Istanbul. The column stood in the centre of the Forum of Constantine, on the second-highest of the seven hills of Nova Roma, and was midway along the Mese odos, the ancient city's main thoroughfare.

Ottoman repairs in c. 1515 added iron reinforcing hoops to the shaft. The column was consequently given the Turkish name Çemberlitaş (from çemberli 'hooped' and taş 'stone'), which also came to refer to the surrounding area.

The column stands at the point where Yeniçeriler Caddesi ('Street of the Janissaries') joined the Divan Yolu ('Road to the Divan'), the two streets connecting Sultanahmet Square with Beyazıt Square and roughly following the course of the old Mese odos. The Roman street led eastward to the Augustaion, the Hippodrome, Hagia Sophia, the Baths of Zeuxippus, and the Chalke Gate of the Great Palace. To the west it led through the Forum of Theodosius to the Philadelphion and the walls of Constantinople. In Constantine's Forum itself the emperor established the original home of the Byzantine Senate.

The column stands right beside the Çemberlitaş stop on the T1 tramline.