Christensen Nunatak is a nunatak 1nmi north of Robertson Island in the Seal Nunataks group, off the east coast of the Antarctic Peninsula. It was discovered in 1893 by a Norwegian expedition under C.A. Larsen, who named it for Christen Christensen of Sandefjord, Norway, a pioneer of modern Antarctic whaling. It was surveyed in 1902 by the Swedish Antarctic Expedition under Otto Nordenskiöld, and in 1947 and 1953 by the Falkland Islands Dependencies Survey.