Partito Socialista is Italian for "Socialist Party" and may refer to:
Socialist Party (San Marino) (, PS), 2012–date Socialist Party (Italy, 1996) (, PS), 1996–2001, led by Ugo Intini and Gianni De Michelis Socialist Party (Italy, 2007) (, PS), founded in 2007 by the merger of six minor social-democratic parties and subsequently renamed Italian Socialist Party (Italian: , PSI)
The term may also refer to:
Italian Socialist Party (Italian: , PSI), 1892–1994 Reformist Socialist Party (Italian: , PSR), 1994–1996, led by Enrico Manca and Fabrizio Cicchitto Sammarinese Socialist Party (Italian: , PSS), 1892–2005 Social Democratic Party of Switzerland (Italian: ), 1888–date
See also List of socialist parties