This thesis is the first comprehensive description and analysis of the inflectional morphology of Mankiyali — an endangered Indo-Aryan language spoken by under 500 people in rural Mansehra District, in Khyber Pakhtunkhwa Province, Pakistan. The study primarily focuses on the morphological patterns involved in inflecting nouns, pronouns, adjectives, and verbs, and discusses the inflectional requirements in forming postpositional and adverbial phrases. With documentary efforts still in early stages and prior research focusing primarily on the phonological characteristics of the language, the study contributes to addressing the absence of linguistic materials available on this language and provides ground for further investigations.