The aim of the present catalogue, a companion to A Catalogue of Svalbard Plants, Fungi, Algae and Cyanobacteria (Elvebakk & Prestrud 1996), has been to critically review the present literature and to use existing databases to compile an updated species checklist for both marine and terrestrial animals. The catalogue consists of three main parts: the marine macro-organisms in Svalbard waters; the terrestrial and freshwater invertebrate fauna of Svalbard (and Jan Mayen); and the bird and mammal fauna of Svalbard. Each covers the entire Svalbard archipelago, but chapter also includes the fauna of Jan Mayen.