Sybaris is an ancient city in Magna Graecia on the western shore of the Gulf of Taranto.

The wealth of the city during the 6th century BCE is so great that the Sybarites become synonymous with pleasure and luxury.

The modern town of Sibari lies near the ruins of the Greek city; it is a frazione of the commune of Cassano allo Ionio, in the province of Cosenza.Sybaris is most likely the earliest of all the Greek colonies in this part of Italy and is founded according to Scymnus Chius, as early as 720 BCE.

It is an Achaean colony, and its Oekist (founder) is a citizen of Helice in Achaia; but they are accompanied by a number of Troezenian citizens.

However the Achaeans eventually drive out the Troezenians.

According to legend the city was founded by the son of Oïlean Ajax.