| Mariateguist Unified Party | |
| Native Name: | Partido Unificado Mariateguista |
| Colorcode: | Red |
| Leader: | Javier Diez Canseco Agustín Haya de la Torre Santiago Pedráglio Hugo Blanco Eduardo Cáceres Carlos Tapia |
| Foundation: | 1984 |
| Ideology: | Communism Marxism-Leninism Mariateguism |
| Country: | Peru |
| Abbreviation: | PUM |
| Merger: | VR MIR PRT PCR |
Mariateguist Unified Party (in Spanish: Partido Unificado Mariateguista – PUM) was a political party in Peru founded in 1984 by Revolutionary Vanguard (VR), Revolutionary Left Movement (MIR), Workers Revolutionary Party (PRT) and a sector of Revolutionary Communist Party (PCR). Leaders included Javier Diez Canseco, Agustín Haya de la Torre, Santiago Pedráglio, Hugo Blanco, Eduardo Cáceres and Carlos Tapia. Maria Elena Moyano was also a member of PUM.
PUM was a part of United Left (IU). In 1990, PUM withdrew from IU. In 1995, it rejoined IU, together with UNIR.