The Hippodrome of Constantinople was a horse-racing track that was the sporting and social centre of Constantinople, capital of the Byzantine Empire and the largest city in Europe. Today it is a square named Sultanahmet Meydani in the Turkish city of Istanbul, with only a few fragments of the original structure surviving.

Although the Hippodrome is usually associated with Constantinople's days of glory as an imperial capital, it actually predates that era. The first Hippodrome was built when the city was called Byzantium (Byzantion in Greek), and was a provincial town of moderate importance. In 203 the Emperor Septimius Severus rebuilt the city and expanded its walls, endowing it with a hippodrome, an arena for chariot races and other entertainments.

In 324, the Emperor Constantine decided to move the seat of the government from Rome to Byzantium, which he renamed Nova Roma (New Rome). This name failed to impress and the city soon became known as Constantinople, the City of Constantine. Constantine greatly enlarged the city, and one of his major undertakings was the renovation of the Hippodrome. It is estimated that the Hippodrome of Constantine was about 150 metres long and 130 metres wide. Its stands were capable of holding 100,000 spectators.

The race-track at the Hippodrome was U-shaped, and the Emperor's box, with four bronze statues of horses on its roof, was located at the eastern end of the track. These horses, whose exact Greek or Roman ancestry has never been determined, were looted during the Fourth Crusade in 1204 and installed on the façade of St Mark's Basilica in Venice. The track was lined with other bronze statues of famous horses and chariot drivers, none of which survive.

In the 10th century the Emperor Constantine Porphyrogenitus built another obelisk at the other end of the Hippodrome. It was originally covered with gilded bronze plaques, but these were stolen during the Fourth Crusade. The stone core of this monument also survives, known as the Walled Obelisk.