Mount Ungaran has abundant of biodiversity potential on the remaining natural forest including flora and fauna. The objective of this research was to know the community knowledge on biodiversity in Mount Ungaran for support biodiversity conservation. The study was conducted on May-August 2019 in two villages, Ngesrepbalong and Banyuwindu, Preliminary data collection included 6 (six) components and 61 person had been interview as a informants. The results were analyzed quantitatively and qualitative description. The results of preliminary research from interviews and Googleforms showed that taxa were the best known to successive respondents sequently : flora (100%), butterfly (98,41%), bird (96.83%), mammal (93,65), dragonfly (90.48%), frog/toads (82.53%), and reptile (73.02%). These results indicate that the flora group is easily recognized by the respondents, while the reptiles are a less well-known group. Many flora groups are well-known because the flora is widely used by people such as the species of pine, orchid, and fern. Nevertheless, more than 70% of respondents apparently did not know that of the several species (47 species) were protected species. Respondents only know 6 (six) protected species and especially from fauna groups, including javanese hawk eagles, whreated hornbill, langurs, porcupines, anteaters, and python.