Partito Socialista
Partito Socialista Unitario
Italian Nettist Party
Gay Party
Party of the South (Italy)
Sardinian People's Party
Italian Pirate Party
Italian Democratic Party of Monarchist Unity
Combatants' Party
Italian Workers' Party
Pensioners' National Party
Partito Popolare
Italian Democratic Socialist Party (2004)
Agrarian Party (Italy)
Humanist Party (Italy)
Party of the Christian Left
Social Democratic Rebirth
Communist Party of Fiume
Love Party (Italy)
Italian Animalist Party
Italian Liberal Party (1997)
Sardinian Action Party
Italian Reformist Socialist Party
Party of Sicilians
Sardinian Socialist Action Party
Action Party (Italy)
Pensioners' Party (Italy)
Peasants' Party of Italy
Economic Party (Italy)
Unitary Socialist Party (Italy, 1949)
Italian People's Party (1919)
Progressive People's Party (Molise)
Italian Radical Party
Militant Christian Party
Left Party – Zona Franca
People's Monarchist Party (Italy)
Constitutional Democratic Party (Italy)
Christian Democratic Party (Italy)
Italian Communist Party
Italian Revolutionary Socialist Party
Sicilian Independent Labour Party
Communist Party (Italy)
List of Partito d'Azione politicians
Party of Democrats
Venetian National Party
Reformist Socialist Party
Sammarinese Democratic Progressive Party
Republican Fascist Party
Proletarian Unity Party (Italy)
Sammarinese Fascist Party
Unitary Socialist Party (Italy, 1922)
Party of Italian Communists
Federalist Party (Italy)
Communist Party (Marxist–Leninist) of San Marino
Labour Democratic Party
Italian Socialist Party of Proletarian Unity
Sammarinese Independent Democratic Socialist Party
New Socialist Party (San Marino)
Monarchist National Party
Social Christian Party (Italy)
New Eritrea Party
Communist Alternative Party
Political-Military Communist Party
Italian Socialist Party (2007)
Swiss Party of Labour
Socialist Party (Italy, 1996)
Southern Democratic Party
Sammarinese Democratic Socialist Party
Workers' Communist Party (Italy)
Sammarinese Socialist Party
Radical Party (Italy)
Trentino Tyrolean Autonomist Party
Democratic Party (Italy)
Democratic Fascist Party
Italian Republican Party
Italian Democratic Liberal Party
Italian Marxist–Leninist Party
Trentino Tyrolean People's Party
Communist Refoundation Party
New Italian Socialist Party
Sammarinese Christian Democratic Party
Communist Party of Italy (Marxist–Leninist)
Party of Socialists and Democrats
Sammarinese Communist Party
Democratic Party of the Left
Italian Socialist Party
Italian People's Party (1994)
Nationalist Party (Malta)
Italian Liberal Party
Free Democratic Party of Switzerland
Futurist Political Party
National Fascist Party
Italian Democratic Socialist Party
Christian Democratic People's Party of Switzerland
Social Democratic Party of Switzerland
Anarchism in Italy
Italian People's Party
Brazilian Communist Party
List of socialist parties
Red Brigades
Andalusian Party