Roald Amundsen, (born July 16, 1872, Borge, near Oslo, Nor.—disappeared June 18, 1928?, Arctic Ocean), Norwegian explorer, leader of the first group to reach the South Pole. In 1897 he took part in a Belgian expedition that was the first to winter in the Antarctic. In 1903–05 he was the first to navigate the Northwest Passage. He planned an expedition to the North Pole, but, after learning that Robert E. Peary had reached that goal, he set off for the South Pole in 1910. He prepared his trip carefully and in October 1911 set out with four men, 52 dogs, and four sledges. He reached the South Pole in December 1911, one month before Robert Falcon Scott’s ill-fated attempt. He returned to Norway and established a successful shipping business. In 1926 he and Umberto Nobile (1885–1978) passed over the North Pole in a dirigible. Amundsen disappeared in 1928 while flying to rescue Nobile from a dirigible crash.