North-East Zone of India constitutes 5.2 per cent of total geographical area endowed with rich biodiversity. This zone depicts the faunistic and floristic resemblance of Indo-Malayan and Indo-Chinese bio-geographical regions. Zoological Survey of India made an attempt to compile all the available information on faunal diversity based on its surveys conducted over a period of more than a hundred years and the published literature elsewhere. It is revealed that altogether 18,527 species in 15 phyla of both Protozoa (243) and Animalia (18,284) have been documented, representing about 18% of the total Indian fauna (1,02,161 species). Phylum Arthropoda with 14,956 species represents 80.7%, of the overall faunal diversity of North-East India. With regards to faunal diversity in its biotic provinces and states, North-East Hills includes 14,838 species, Brahmaputra Valley 8,832 species, Meghalaya 9,853 species, Assam 9,607 species, Manipur 5,036 species, Nagaland 3,869 species, Tripura 3,605 species, and Mizoram 3,020 species. Out of 718 threatened species from India assessed by IUCN, 153 species are also distributed in North-East India, representing about 22.35% of total Indian threatened fauna. To protect the unique biodiversity of North-East Bio-geographical zone, 174 Protected Areas have been notified by Government of India