In A Grammar of Muylaq’ Aymara, Matt Coler provides a detailed description of a highly-endangered variety of Aymara spoken in the remote Andean village of Muylaque (Muylaq’i), in Southern Peru. This heretofore undescribed variety has many unique characteristics that shed light on the impressive extent of variation in Aymara.Using natural language data gathered during several field trips to Muylaque, Coler offers a detailed analysis of the phonetics, phonology, morphology and syntax of Aymara. Additionally, A Grammar of Muylaq’ Aymara includes complete interlinear glosses for several personal narratives.A Grammar of Muylaq’ Aymara represents an important contribution not only to the study of Aymara, Aymara variation, and Andean languages, but also to research into linguistic typology and language contact.