Italian Socialist Party of Proletarian Unity
| Italian Socialist Party of Proletarian Unity Partito Socialista Italiano di Unità Proletaria | |
|---|---|
| Abbreviation | PSIUP | 
| President | Lelio Basso | 
| General Secretary | Tullio Vecchietti | 
| Spokesperson | Dario Valori | 
| Founded | 12 January 1964 | 
| Dissolved | 13 July 1972 | 
| Split from | Italian Socialist Party | 
| Merged into | Italian Communist Party | 
| Headquarters | Rome, Italy | 
| Newspaper | Mondo nuovo | 
| Membership (1970) | 200,000 | 
| Ideology | Socialism Marxism Frontism Factions Pro-Soviet Union Pro-Castro Pro-China Revolutionary socialism Libertarian socialism | 
| Political position | Left-wing Factions Far-left | 
| Colours | Red | 
| Party flag | |
The Italian Socialist Party of Proletarian Unity (Partito Socialista Italiano di Unità Proletaria, PSIUP) was a political party in Italy, active from 1964 to 1972.