Danco Island or Isla Dedo is an island off Antarctica, 1 nmi long lying in the southern part of Errera Channel, off the west coast of Graham Land. It was charted by the Belgian Antarctic Expedition under Adrien de Gerlache, 1897–1899. Danco Island was surveyed by the Falkland Islands Dependencies Survey from MV Norsel (1945) in 1955, and named by the UK Antarctic Place-names Committee for Emile Danco (1869–1898), a Belgian geophysicist and member of the Belgian Antarctic Expedition, who died on board Belgica in the Antarctic.

Station O

Danco Island was the location of the British research Station O. It was active from 26 February, 1956 to 22 February, 1959 with the intention of searching in the survey and geology. The main hut was named Arendal and was demolished and removed by British Antarctic Survey in April 2004.