| 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 |