The siege of Syracuse from 344 to 343/342 BC was part of a war between the Syracusan general Hicetas and the tyrant of Syracuse, Dionysius II. The conflict became more complex when Carthage and Corinth became involved. The Carthaginians had made an alliance with Hicetas to expand their power in Sicily. Somewhat later, the Corinthian general Timoleon arrived in Sicily to restore democracy to Syracuse. With the assistance of several other Sicilian Greek cities, Timoleon emerged victorious and reinstated a democratic regime in Syracuse. The siege is described by the ancient historians Diodorus Siculus and Plutarch, but there are important differences in their accounts.

Syracuse is a historic city on the Italian island of Sicily, the capital of the Italian province of Syracuse. The city is notable for its rich Greek and Roman history, culture, amphitheatres, architecture, and as the birthplace and home of the pre-eminent mathematician and engineer Archimedes. This 2,700-year-old city played a key role in ancient times, when it was one of the major powers of the Mediterranean world. Syracuse is located in the southeast corner of the island of Sicily, next to the Gulf of Syracuse beside the Ionian Sea. It is situated in a drastic rise of land with 2,000 metres (6,600 ft) depths being close to the city offshore although the city itself is generally not so hilly in comparison.