| Country: | Portugal |
| Workers Party of Socialist Unity | |
| Native Name: | Partido Operário de Unidade Socialista |
| Colorcode: | red |
| Leader: | Collective leadership (Central Committee) |
| Foundation: | 1979 |
| Ideology: | Communism Marxism Trotskyism |
| Position: | Far-left |
| Membership Year: | 2014 |
| International: | Fourth International |
| Dissolved: | 2020 |
| Colours: | Red |
| Headquarters: | Lisbon, Portugal |
| Website: | https://pous4.no.sapo.pt/ |
Workers Party of Socialist Unity (Portuguese: Partido Operário de Unidade Socialista, pronounced as /pt/, POUS) was a small Trotskyist former political party in Portugal, founded by Aires Rodrigues and Carmelinda Pereira in 1979 after a split from the Portuguese Socialist Party.[1] It is a member of the Fourth International led by Pierre Lambert. It disbanded itself as a registered political party on November 14, 2020. It will continue to exist as a political association.[2]