The history of the Italian Republic concerns the events relating to the history of Italy that have occurred since 1946, when Italy became a republic after the 1946 Italian institutional referendum. The Italian republican history is generally divided into two phases, the First and Second Republic.

An institutional referendum was held by universal suffrage in the Kingdom of Italy on 2 June 1946, a key event of contemporary Italian history. Until 1946, Italy was a kingdom ruled by the House of Savoy, reigning since the unification of Italy in 1861 and previously rulers of the Kingdom of Sardinia. In 1922, the rise of Benito Mussolini and the creation of the Fascist regime in Italy, which eventually resulted in engaging the country in World War II alongside Nazi Germany, considerably weakened the role of the royal house.