The Parthenopean Republic or Neapolitan Republic was a short-lived, semi-autonomous republic located within the Kingdom of Naples and supported by the French First Republic. The republic emerged during the French Revolutionary Wars after King Ferdinand IV fled before advancing French troops. The republic existed from 21 January to 13 June 1799, collapsing when Ferdinand returned to restore monarchial authority and forcibly subdued republican activities.

The Kingdom of Naples, was a state that ruled the part of the Italian Peninsula south of the Papal States between 1282 and 1816. It was established by the War of the Sicilian Vespers (1282–1302), when the island of Sicily revolted and was conquered by the Crown of Aragon, becoming a separate kingdom also called the Kingdom of Sicily. This left the Neapolitan mainland under the possession of Charles of Anjou. Later, two competing lines of the Angevin family competed for the Kingdom of Naples in the late 14th century, which resulted in the death of Joanna I by Charles III of Naples. Charles' daughter Joanna II adopted King Alfonso V of Aragon as heir, who would then unite Naples into his Aragonese dominions in 1442.