National Socialist Bloc (in Swedish: Nationalsocialistiska Blocket) was a Swedish national socialist political party formed in the end of 1933 by the merger of Nationalsocialistiska Samlingspartiet, Nationalsocialistiska Förbundet and local National Socialist units connected to the advocate Sven Hallström in Umeå. Later Svensk Nationalsocialistisk Samling merged into NSB.