| Summary: | Polymastiidae (Porifera: Demospongiae) of the Nordic and Siberian Seas are revised and compared with the related species of the North Atlantic based on the morphological data from the type and comparative material and the molecular data from fresh samples. Twenty species from six polymastiid genera are recorded. Two species, Polymastia svenseni from Western Norway and Spinularia njordi from the Norwegian Sea, are new to science. One species, Polymastia andrica , is new to the Nordic Seas and two species, Polymastia cf. bartletti and P. penicillus , are new to the Scandinavian Coast. Distribution of the polymastiids in the North Atlantic and Arctic is discussed and the allegedly wide distribution of Spinularia sarsii and S. spinularia is questioned. We would like to express our gratitude to all colleagues, who kindly provided the access to the sponge collections of their institutions: Jean-Marc Gagnon (Canadian Museum of Nature, Ottawa), Erica Mejlon (Museum of Evolution, University of Uppsala), Kennet Lundin and Carola Azurduy Högström (Gothenburg Natural History Museum), Miche`le Bruni (Musée Océanographique de Monaco), Carsten Lüter (Museum für Naturkunde, Berlin), Isabelle Domart-Coulon (Muséum National d'Histoire Naturelle, Paris), Clare Valentine, Andrew Cabrinovic and Emma Sherlock (Natural History Museum, London), Nicole de Voogd and J. Koos van Egmond (Naturalis Biodiversity center, Leiden), Lutz Bachmann and Ase Ingvild Wilhelmsen (Natural History Museum, University of Oslo), Ole Secher Tendal (Natural History Museum of Denmark, University of Copenhagen), Bernard E. Picton (Ulster Museum, National Museums of Northern Ireland, Belfast), Jon Anders Kongsrud (University Museum of Bergen, Natural History Collections), Torkild Bakken (University Museum of the Norwegian University of Science and Technology, Trondheim), Olga Bozhenova (Zoological Institute of Russian Academy of Sciences, Saint-Petersburg). We are also thankful to Bjørn Gulliksen (University of Tromsø), Bjørn Tore Dragnes (OMNIMAR Dragnes, ...
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