- Language: Pirahã
- Alternate names: Pirahán, Piraha, Múra-Pirahã, Mura-Piraha, Pirahá
- Language code: myp
- Language family: Muran (SIL classification)
- Number of speakers: 389
- Vulnerability: Vulnerable
- Script: Latin script.
In 1960s the population dwindled to 80 due to high infant mortality, death of mothers giving birth, and disease. Modern medicine helped population growth.
Everett (2008) does not believe in a Muran family; rather, he believes that “Pirahã and the now extinct related dialect, Mura, form a single language isolate, unrelated to any other known language” (Everett 2008: 28), that they are “two very similar dialects of a single language” (2008: 29). Mason (1950: 285) also considered the three Muran "languages" as dialects. Ethnologue (2013) also to group Pirahã and Múra together as a single language (for which they give Múra-Pirahã as an alternant name).