Lamontichthys avacanoeiro[1] is a species of catfish in the family Loricariidae.

It is native to South America, where it occurs in the upper Tocantins River basin in Brazil.

The species reaches 16 centimetres (6.3 in) in standard length.

Its specific name, avacanoeiro, refers to the Avá-Canoeiro people, speakers of the Avá-Canoeiro language, who inhabit the upper Tocantins basin.

This article relating to Loricariinae is a stub.