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