The article is devoted to grammatical category of the cases in Dongolese languages. The case category has more than once attracted the attention of philologists and has become the subject of study in many scientific works. Various approaches and methods have been used to analyze this category. At the same time, grammatical category is of particular importance for studying, which consists in learning a language through its systemic study. Significance of the Study this is a descriptive syntactic study applying a modern linguistic analysis method on Dongolese to Grammatical category of the cases Dongolese languages. Modern studies on the grammar categories of the Dongolese languages have not been carried out. This will be the first scientific work and attempt to study grammatical categories Dongolese language.