Ronciglione is a city and comune in the province of Viterbo, Lazio (central Italy), about 20 kilometres (12 mi) from Viterbo. The city is located in the Cimini mountains, over two tuff scarps, on the SE slope of the former volcano crater now housing the Lake Vico.

The city's economy is based largely on agriculture, with production of nuts, chestnuts and wine.

The most ancient document mentioning Ronciglione dates to 1103. A historian from the 16th century Orvieto set its foundation around 1045, due to the Prefetti of Vico. Later it was a possession of the Anguillara, a Guelph family of Rome. Pope Paul II conquered it to the Papal States in 1465.

In 1526 Ronciglione became a possession of the Farnese, and lived its period of greatest splendour: its industries included manufacturing of copper, iron, paper, weapons and others. Ended in 1649 the Farnese seignory and bought back by Pope Innocent X, in 1728 it received the status of city by Pope Benedict XIII.

The Ronciglionesi took active part in the Roman Republic of 1798–99: the French troops, however, crushed the revolt and burnt the city on July 20, 1799.

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