The present state of diversity in the fauna of the Western Polissya has been described. Three-hundred-and-thirty-three species occur vertebrates there, among them 30 fish, 12 amphibians, 7 reptiles, 250 birds species and 44 species of mammals. Eupalasiella percnura and Carassius carassius are ones among the rarest fish species. Bufo calamita – among amphibians and Emys orbicularis and Coronella austriaca – among reptiles. One oat species (Myotis myotis) was found for the first time in the territory of the Shatsk National Park, the Volynske Polissya. Mustella erminea, Meles meles, Lutra lutra, Felis sylvestris, Eptesicus hilssoni are ones among the rarest mammal species found there. They are all listed in the Red Data Book. Ninety-five species of birds from four international conservation categories are present in the ornithocenosis.