Bantimurung-Bulusaraung National Park is the largest karst-ecosystem in Indonesia. Situated in the centre of Wallacea-Bioregion, the national parkhas significance role as stonghold of many species taht are endemic to this biodiversity\u27s hot spot. This study aims to reveal mammals\u27diversity in the national park. The study was conducted from February to March 2011. At leat 12 species consisting of 9 family of mammals recorded in the national park including the endemic and rare species such as Sulawesis\u27s Moore Macaque Macaca maura, Sulawesi\u27s Bear Cuscus Ailurops ursinus, Sulawesis\u27s Dwarf Cuscus Strigocuscus celebensis, and Tarsier Tarsius fuscus