- Language: Mashco Piro
- Alternate names: Mashco, Mashco Piro
- Language code: cuj
- Language family: Maipurean, Southern, Southern Outlier, Piro Piro (SIL classification)
- Number of speakers: 200-600
- Vulnerability: Endangered
Crevels (2012) lists Mashco (Mashco-Piro) as an unclassified language spoken by an uncontacted group who reportedly speak a language related to Piro (Arawakan). Aikhevald (1999a:68) gives Mashko-Piro as a separate language in her Piro-Apuriná group of South-Western Arawak[an], but indicates it may be a dialect of Iñapari.