Italian fascism (Italian: fascismo italiano), also called classical fascism and fascism, is the original fascist ideology, which Giovanni Gentile and Benito Mussolini developed in Italy. The ideology of Italian fascism is associated with a series of political parties led by Mussolini: the National Fascist Party (PNF), which governed the Kingdom of Italy from 1922 until 1943, and the Republican Fascist Party (PFR), which governed the Italian Social Republic from 1943 to 1945. Italian fascism also is associated with the post–war Italian Social Movement (MSI) and later Italian neo-fascist political organisations.

Italian fascism originated from ideological combinations of ultranationalism and Italian nationalism, national syndicalism and revolutionary nationalism, and from the militarism of Italian irredentism to regain "lost overseas territories of Italy" deemed necessary to restore Italian nationalist pride. Italian Fascists also claimed that modern Italy was an heiress to the imperial legacy of Ancient Rome, and that there existed historical proof which supported the creation of an Imperial Fascist Italy to provide spazio vitale (vital space) for the Second Italo-Senussi War of Italian settler colonisation en route to establishing hegemonic control of the terrestrial basin of the Mediterranean Sea.

Italian fascism promoted a corporatist economic system, whereby employer and employee syndicates are linked together in associations to collectively represent the nation's economic producers and work alongside the state to set national economic policy. This economic system intended to resolve class conflict through collaboration between the classes.

Italian fascism opposed liberalism, especially classical liberalism, which fascist leaders denounced as "the debacle of individualism". Fascism was opposed to socialism because of the latter's frequent opposition to nationalism, but it was also opposed to the reactionary conservatism developed by Joseph de Maistre. It believed the success of Italian nationalism required respect for tradition and a clear sense of a shared past among the Italian people, alongside a commitment to a modernised Italy.

Originally, many Italian fascists were opposed to Nazism, as fascism in Italy did not espouse Nordicism nor, initially, the antisemitism inherent in Nazi ideology; however, many fascists, in particular Mussolini himself, held racist ideas (specifically anti-Slavism) that were enshrined into law as official policy over the course of fascist rule. As Fascist Italy and Nazi Germany grew politically closer in the latter half of the 1930s, Italian laws and policies became explicitly antisemitic due to pressure from Nazi Germany (although antisemitic laws were rarely enforced in Italy), including the passage of the Italian racial laws. When the fascists were in power, they also persecuted some linguistic minorities in Italy. In addition, the Greeks in Dodecanese and Northern Epirus, which were then under Italian occupation and influence, were persecuted.

The Italian term fascismo is derived from fascio, meaning 'bundle of sticks', ultimately from the Latin word fasces. This was the name given to political organizations in Italy known as fasci, groups similar to guilds or syndicates. According to Italian fascist dictator Benito Mussolini's own account, the Fasces of Revolutionary Action were founded in Italy in 1915. In 1919, Mussolini founded the Italian Fasces of Combat in Milan, which became the National Fascist Party two years later. The fascists came to associate the term with the ancient Roman fasces or fascio littorio, a bundle of rods tied around an axe, an ancient Roman symbol of the authority of the civic magistrate, carried by his lictors. The symbolism of the fasces suggested strength through unity: a single rod is easily broken, while the bundle is difficult to break.

Prior to 1914, the fasces symbol was widely employed by various political movements, often of a left-wing or liberal persuasion. For instance, according to Robert Paxton, "Marianne, symbol of the French Republic, was often portrayed in the nineteenth century carrying the fasces to represent the force of Republican solidarity against her aristocratic and clerical enemies." The symbol often appeared as an architectural motif, for instance on the Sheldonian Theater at Oxford University and on the Lincoln Memorial in Washington, D.C.

Italian fascism is based upon Italian nationalism and in particular, it seeks to complete what it considers the incomplete project of Risorgimento by incorporating Italia Irredenta (unredeemed Italy) into the state of Italy. The National Fascist Party (PNF) founded in 1921 declared that the party was to serve as "a revolutionary militia placed at the service of the nation. It follows a policy based on three principles: order, discipline, hierarchy".