Mammals are wild animals that are often considered as pests by the community, even though the existence of mammals has an important role in the preservation of forest ecosystem as soil fertilizers, pollinators, seed dispersers, and biological bugs control. Forest is habitat for flora and fauna, but now the forests in Kalimantan are starting to be degraded caused by land clearing of plantations, illegal logging and infrastructure development. Forest degradation is very influential on forest cover, especially mammals. Land clearing by plantation companies has an impact on the survival of animals and vegetation in the plantation area. Food sources and shelter for mammals is reduced. That makes mammals move to habitats that are good vegetation and ecosystems. This study aims to record the diurnal mammal species and find out the diversity of species of mammals diumal in several forest types in the IUPHHK-HT area of PT.  Hutan Ketapang Industri district Ketapang. This research was conducted on 25 February 2019 until 23 March 2019 to obtain data on species of mammals diumal in a number of forest types in the IUPHHK-HT area of PT. Hutan Ketapang Industri district Ketapang.  The results of this study are expected to provide data and information on the types of diurnal mammals and the diversity of diurnal mammal species in several forest types in the IUPHHK-HT area of PT.  Hutan Ketapang Industri district Ketapang The results of observations in five habitat types were found as many as 8 species belonging to 6 families.  In Kerangas forest 2 species were found with 7 individuals, Peat Swamp forest was found 5 species with 15 individuals, Lowland Dipterocarpa forest was found  7 species with 19 individuals, Riparian forest was found  3 species with 9 individuals. and Open Wetlands / Flood Plains are found  3 species with a number of individuals 11.Keywords: Mammals Diumal, Diversity, Five Habitat Types