Lithuanian Popular Socialist Democratic Party ended in 1922.
Socialist Party of Vietnam ended in 1988.
British Socialist Party ended in 1920.
Portuguese Socialist Party ended in 1933.
Italian Socialist Party ended in 1994.
Socialist Party of Washington ended in 1972.
Sammarinese Socialist Party ended in 2005.
Socialist Union Party ended in 1941.
Pacifist Socialist Party ended in 1991.
Republican-Socialist Party ended in 1934.
Socialist Party of America ended in 1973.
Socialist Mexican Party ended in 1989.