Johan Severin Svendsen (30 September 1840 – 14 June 1911) was a Norwegian composer, conductor and violinist. Born in Christiania (now Oslo), Norway, he lived most his life in Copenhagen, Denmark. Svendsen's output includes two symphonies, a violin concerto, a cello concerto, and the Romance for violin, as well as a number of Norwegian Rhapsodies for orchestra. At one time Svendsen was an intimate friend of the German composer Richard Wagner.