The British National Antarctic Expedition, 1901–04, generally known as the Discovery Expedition, was the first official British exploration of the Antarctic regions since James Clark Ross's voyage sixty years earlier. Organized on a large scale under a joint committee of the Royal Society and the Royal Geographical Society (RGS), the new expedition aimed to carry out scientific research and geographical exploration in what was then largely an untouched continent. It launched the Antarctic careers of many who would become leading figures in the Heroic Age of Antarctic Exploration, including Robert Falcon Scott who led the expedition, Ernest Shackleton, Edward Wilson, Frank Wild, Tom Crean and William Lashly.

Its scientific results covered extensive ground in biology, zoology, geology, meteorology and magnetism. There were important geological and zoological discoveries, including those of the snow-free McMurdo Dry Valleys and the Cape Crozier Emperor Penguin colony. In the field of geographical exploration, achievements included the discoveries of King Edward VII Land, and the Polar Plateau via the western mountains route. The expedition did not make a serious attempt on the South Pole, its principal southern journey, only travelling to the Farthest South mark at a reported 82°17′S.