The Piro languages, a.k.a. Purus, or in Aikhenvald South-Western Arawak, are Arawakan languages of the Peruvian and western Brazilian Amazon.

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Kaufman (1994) gives the following breakdown:

Kaufman had considered the last to be a dialect of Piro; Aikhenvald suggests it may have been a dialect of Iñapari.

• Brandão, Ana Paula; Sidi Facundes. Estudos comparativos do léxico da fauna e flora Aruák. Boletim do Museu Paraense Emílio Goeldi. Ciências humanas, Belém, v. 2, n. 2, p. 133–168, May/Aug. 2007.
• Facundes, Sidney da Silva. The language of the Apurinã people of Brazil (Arawak). Doctoral dissertation, University of New York at Buffalo, Buffalo, 2000.
• Facundes, Sidney da Silva. The comparative linguistic methodology and its contribution to improve the knowledge of Arawakan. In: Hill, Jonathan D.; Fernando Santos-Granero (eds.). Comparative Arawakan histories. Illinois: University of Illinois Press, 2002. p. 74–96.