Abstract
This article presents a comprehensive comparative-typological analysis of case suffixes in the Kazakh and Kyrgyz languages. Despite their historical and genetic kinship and structural similarities, each language exhibits distinct morphological characteristics. The Kazakh language has seven grammatical cases, while the Kyrgyz language employs six. The key difference lies in the absence of the instrumental case as a morphological category in Kyrgyz, where its meaning is expressed analytically through the postposition menen. The study systematically outlines the phonetic-phonological conditions, semantic functions, and differences in synthetic versus analytic expression of case meanings. It also examines case forms in pronouns, substantivized adjectives, and words with plural and possessive suffixes. The Kazakh case system is characterized as more morphologically cohesive and synthetic, while the Kyrgyz language shows a tendency toward analyticism. This research addresses key issues in grammatical typology and the morphological evolution of Turkic languages, highlighting both their shared features and the divergent paths of internal development in each language system.