Partito Socialista

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)

• 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