Guató is a possible language isolate spoken by 1% of the Guató people of Brazil.

Kaufman (1990) provisionally classified Guató as a branch of the Macro-Jê languages, but no evidence for this was found by Eduardo Ribeiro. Martins (2011) also suggests a relationship with Macro-Jê.^[3]

Jolkesky (2016) notes that there are lexical similarities with the Bororo, Tupi, and Karib language families due to contact.^[4]

An automated computational analysis (ASJP 4) by Müller et al. (2013)^[5] found lexical similarities between Guató and the Zamucoan languages. However, since the analysis was automatically generated, the grouping could be either due to mutual lexical borrowing, genetic inheritance, or chance resemblances.

Today, Guató is spoken in Guató Indigenous Territory and Baía dos Guató Indigenous Territory.^[6]

Loukotka (1968) reported that in Mato Grosso do Sul, Brazil, Guató is spoken on the banks of the Paraguay River and up the São Lourenço River, along the Bolivian border.^[1] It is also spoken at Uberaba Lake^[2] in Santa Cruz Department (Bolivia).

The Guató vowel system, like that of Macro-Jê languages, collapses a three-way distinction of height in oral vowels to two in nasal vowels.^[7][8]

Loukotka (1968) lists the following basic vocabulary items for Guató.^[2]

For more extensive vocabulary lists of Guató by Palácio (1984)^[7][9] and Postigo (2009),^[8] see the corresponding Portuguese article.