| 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
 |