Pakistan characterized by a unique blend of bloomy and faunal variety of mammals. The main objectives of study are to know the diversity and density of mammalian species in the vicinity of Chinji National Park, district Chakwal, Punjab, Pakistan. The data were collected through ���direct count method��� and ���indirect count method���. Total of 22 species of mammals were recorded from Chinji National Park. From data analysis Shannon-Weiner diversity Index recorded was 0.91, Evenness 0.77 and Margalef Index was 5.31. It was found that dessert hare (Lepus nigricollis) and Asiatic jackal (Canis aureus) were the dominating species of the study area. During study, it was noted that mammalian species are continuously declining due to human interruption.