William Lashly was a Royal Navy seaman who served as lead stoker on both the Discovery expedition and the Terra Nova expedition to Antarctica, for which he was awarded the Polar Medal. Lashly was also recognised with the Albert Medal for playing a key role in saving the life of a comrade on the second of the two expeditions.

The Discovery Expedition of 1901–1904, known officially as the British National Antarctic Expedition, was the first official British exploration of the Antarctic regions since the voyage of James Clark Ross sixty years earlier (1839–1843). Organized on a large scale under a joint committee of the Royal Society and the Royal Geographical Society (RGS), the new expedition carried 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.