L'anniversario della liberazione d'Italia (anche chiamato festa della Liberazione, anniversario della Resistenza o semplicemente 25 aprile) è una festa nazionale della Repubblica Italiana che ricorre il 25 aprile di ogni anno.
È un giorno fondamentale per la storia d'Italia ed assume un particolare significato politico e militare, in quanto simbolo della vittoriosa lotta di resistenza militare e politica attuata dalle forze partigiane durante la seconda guerra mondiale a partire dall'8 settembre 1943 contro il governo fascista della Repubblica Sociale Italiana e l'occupazione nazista.
Italy's Liberation Day (Festa della Liberazione), also known as the Anniversary of the Liberation (Anniversario della liberazione d'Italia), Anniversary of the Resistance (anniversario della Resistenza), or simply April 25 is a national Italian holiday commemorating the end of the Italian Civil War and the end of Nazi occupation of the country during World War II. This is distinct from the Feast of the Republic (Festa della Repubblica) which takes place on June 2.
The date was chosen by convention, as it was the day of the year 1945 when the National Liberation Committee of Upper Italy (CLNAI) officially proclaimed the insurgency in a radio announcement, propounding the seizure of power by the CLNAI and proclaiming the death sentence for all fascist leaders (including Benito Mussolini, who was shot three days later).
By May 1, all of northern Italy was liberated, including Bologna (April 21), Genoa (April 23), Milan and Turin (April 25), and Venice (April 28). The liberation put an end to twenty years of fascist dictatorship and five years of war. It symbolically represents the beginning of the historical journey which led to the referendum of June 2, 1946, when Italians opted for an end to the monarchy and the creation of the Italian Republic, which was followed by the adoption of the republic's Constitution of Italy in 1948.