English: The Obelisk of Theodosius is the Ancient Egyptian obelisk of Pharaoh Tutmoses III re-erected in the Hippodrome of Constantinople by the Roman emperor Theodosius I in the 4th century AD.

The marble pedestal had bas-reliefs dating to the time of the obelisk's re-erection in Constantinople.

It is made of red granite from Aswan and was originally 30m tall. The lower part was damaged probably during its transport or re-erection, so the obelisk now only 18.54m high. Between the four corners of the obelisk and the pedestal are four bronze cubes, used in its transportation and re-erection.

Each of its four faces has a single central column of inscription, celebrating Tutmoses III's victory on the banks of the river Euphrates in 1450 BC.

The marble pedestal had bas-reliefs dating to the time of the obelisk's re-erection in Constantinople. On one face Theodosius I is shown offering the crown of victory to the winner in the chariot races, framed between arches and Corinthian columns, with happy spectators, musicians and dancers assisting in the ceremony. In the bottom right of this scene is the water organ of Ctesibius and on the left another instrument.