Introduction. This article presents the first analysis of the phonetic, morphological, and certain syntactic features of the Malmyzh dialect, based on the extensive linguistic material found in E. Beke’s dialect dictionary of the Mari language. A comparative analysis is conducted against data from other dialects. The purpose of the study is to provide a detailed analysis of the Malmyzh dialect based on E. Beke's dialect dictionary. Materials and methods. The study uses scientific articles and monographs on the Mari language and Mari dialectology, as well as E. Beke's "Dictionary of Mari Dialects." The article employs comparative-historical and descriptive methods. When necessary, a historical overview is provided. Research results and discussions. The Malmyzh dialect differs from other dialects of the Mari language in its phonetic features, rich case system, and the preservation of certain relict phenomena in morphology and syntax. Conclusion. The Malmyzh dialect occupies a transitional position between the western and eastern dialects of the Mari language. Features are observed in the areas of phonetics, morphology, and syntax.