Nils Larsen (19 June 1900 in Sandar – 29 September 1976 in Sandefjord) was a Norwegian sea captain. Larsen is perhaps most associated with the Norvegia expeditions of Antarctica.
He was a noted whaler, captaining a number of whaling ships principally for Thor Dahl A/S of Sandefjord. He also served as a first mate on Norvegia expeditions of Antarctica financed by Norwegian whale-ship owner Lars Christensen. During these expeditions, Norway achieved annexation of Bouvet Island (1927) and Peter I Island (1929).
Geographical areas in Antarctica named after Larsen include: Mount Nils Larsen (Queen Maud Land), Mount Nils (Enderby Land) and Nils Larsen Glacier (Peter I Island).