| Country  |  Party  |  Political orientation  |  Reason defunct  | 
  | Australia  |  Workers Party  |  Libertarian  |    | 
  | Bahamas  |  Workers' Party  |    |    | 
  | Barbados  |  Workers Party of Barbados  |  Marxist  |  Defunct due to unpopularity  | 
  | Brazil  |  Worker's and Peasant's Bloc  |    |  1937–1930.  | 
  | Brazil  |  Work's National Union  |    |  1945–1948.  | 
  | Brazil  |  Nationalist Workers' Party  |    |  1989.  | 
  | Brazil  |  Nationalist Brazilian Workers' Party  |    |  1989–1992. Merged into Labour Party of Brazil.  | 
  | Brazil  |  General Workers' Party  |    |  1995–2003. Merged into Liberal Party.  | 
  | Cambodia  |  Workers' Party of Kampuchea (1960–1966)  |  Communist  |  Renamed to Communist Party of Kampuchea in 1966. Dissolved in 1981.  | 
  | Canada  |  Workers' Party of Canada (1922–1924)  |  Communist  |  Legal face of the illegal Communist Party until the government's ban was lifted.  | 
  | Canada  |  Workers' Party of Canada (1934–1937)  |  Trotskyist  |  Dissolved upon entry into the Co-operative Commonwealth Federation. Reformed in 1939 as the Socialist Workers League.  | 
  | Canada  |  Revolutionary Workers Party (1946–1952)  |  Trotskyist  |  Entered the Co-operative Commonwealth Federation.  | 
  | Croatia  |  Croatian Workers Party (1906–1918)  |  Left-wing populist  |    | 
  | Czech Republic  |  Workers' Party  |  National Socialist  |  Banned in 2010 by the Supreme Administrative Court of the Czech Republic  | 
  | Estonia  |  Estonian Workers' Party  |  Communist  |    | 
  | Ethiopia  |  Workers' Party of Ethiopia  |  Marxist–Leninist  |  Overthrown in 1991  | 
  | Finland  |  Socialist Workers' Party of Finland  |  Marxist  |  Banned in 1923  | 
  | France  |  Workers' Party (France, 1991–2008)  |  Trotskyist  |    | 
  | Germany  |  German Workers' Party  |  Nationalist  |  Renamed the National Socialist German Workers' Party in 1920  | 
  | Germany  |  National Socialist German Workers' Party  |  National Socialist  |  Dissolved and banned in 1945  | 
  | Germany  |  Workers' Party of Germany  |  Juche  |    | 
  | Hungary  |  Hungarian Workers' Party  |  National Socialist  |  Dissolved and regrouped  | 
  | Ireland  |  Irish Workers' Party  |  Communist  |  Merged with the Communist Party of Northern Ireland to reconstitute the all-Ireland Communist Party of Ireland in 1962  | 
  | Israel  |  Workers Party of Eretz Israel (Mapai)  |  Labor Zionism  |  Merged into the Israeli Labor Party  | 
  | Israel  |  United Workers Party (Mapam)  |  Labor Zionism  |  Merged into Meretz  | 
  | Israel  |  Workers of Agudat Yisrael  |  Haredi Judaism  |    | 
  | Korea  |  Workers' Party of North Korea Workers' Party of South Korea  |  Communist Communist  |  Merged to form the Workers' Party of Korea in 1949  | 
  | Latvia  |  Workers' Party  |  Left-wing politics  |    | 
  | Mexico  |  Mexican Workers' Party  |  Social democratic  |  Merged with the Unified Socialist Party of Mexico to form the Mexican Socialist Party in 1987  | 
  | New Zealand  |  Workers Party of New Zealand  |  Marxist  |  Renamed to Fightback in 2013  | 
  | North Macedonia  |  Workers Party  |  Left-wing politics  |    | 
  | Poland  |  Polish Workers' Party  |  Communist  |  Merged to form the Polish United Workers' Party in 1948  | 
  | Poland  |  Polish United Workers' Party  |  Marxist–Leninist  |  Self-dissolved in 1990  | 
  | Poland  |  Zionist Workers Party  |    | 
  | Romania  |  Romanian Workers' Party  |  Communist  |  Renamed the Romanian Communist Party in 1965  | 
  | South Africa  |  Workers Party of South Africa  |  Trotskyist  |  Banned in 1953  | 
  | Spain  |  Workers' Party of Marxist Unification  |  Marxist  |  Dissolved in 1980  | 
  | Trinidad and Tobago  |  Workers and Farmers Party  |  Marxist  |  Defunct due to unpopularity  | 
  | Trinidad and Tobago  |  British Empire Citizens' and Workers' Home Rule Party  |  Garveyism  |  Popularly known as the Butler Party, defunct due to unpopularity  | 
  | Trinidad and Tobago  |  Progressive Workers Democrat Movement  |    |  Defunct due to unpopularity  | 
  | Turkey  |  Workers' Party  |  Scientific socialist  |  Renamed the Patriotic Party in 2015  | 
  | United Kingdom  |  International Leninist Workers Party  |  Marxist–Leninist  |  Dissolved into the Socialist Labour Party in 1996  | 
  | United Kingdom  |  Workers Party of Scotland  |  Marxist–Leninist  |    | 
  | United States  |  Democratic Workers Party  |  Marxist–Leninist  |  Dissolved in 1986  | 
  | United States  |  Workers Party  |  Trotskyist  |  Renamed the Independent Socialist League in 1949  | 
  | United States  |  American Workers Party  |  Musteite  |  Merged into Workers Party of the United States  | 
  | United States  |  Workers Party of America  |  Marxist–Leninist  |  Became Communist Party USA in 1929.  | 
  | United States  |  Workers Party of the United States  |  Trotskyist  |  Absorbed into the Socialist Party of America in 1936  |