This thesis provides a detailed description and analysis of the Mankiyali phonology, a hitherto undocumented and endangered language of northern Pakistan. The language is spoken by about 500 people in a remote mountainous area in the Mansehra district of Khyber Pakhtunkhwa Province, Pakistan. The data contained herein is a result of first-hand fieldwork with native Mankiyali speakers between 2019 and 2021. Data collection methods include recordings of naturally occurring discourse (e.g., stories, poems, conversations) and elicitation sessions with native speaker consultants. Topics covered in the thesis include an account of Mankiyali's phonemic inventory, phonotactics, a description of some phonological processes, minimal word constraints, and word stress placement.