William Colbeck (1871–1930) was a British seaman who distinguished himself on two Antarctic expeditions.
William Colbeck was born on 8 August 1871, in Myton Place, Hull. He was the fifth child in a family of ten born to Christopher Colbeck, a baker, and his wife Martha. Educated at Hull Grammar School, Colbeck served a merchant navy apprenticeship between 1886 and 1890, earning his second mate's certificate in 1890, first mate's certificate in 1892, master's in 1894 and extra master's in 1897. He was awarded a Royal Navy reserve commission in 1898. In that year he was invited by the Norwegian Carsten Borchgrevink to join the Southern Cross Expedition to the Antarctic. This would be the first expedition to overwinter on the Antarctic mainland; Colbeck took charge of the expedition's magnetic observation work.
After returning to England in 1900, Colbeck was soon going southward again, this time in command of the relief ship Morning, sent to resupply Captain Scott's Discovery, then trapped in the ice at McMurdo Sound in the Antarctic. He was awarded the Royal Geographical Society's Back Award in 1901.
On their way south the Morning celebrated Christmas Day 1902 by crossing the Antarctic Circle and discovering a previously uncharted island which they named Scott Island. Colbeck and three officers landed on the island where they collected rock samples and had a drink. The adjacent cone-shaped islet Colbeck named Haggitt's Pillar, after his mother's maiden name.
In January 1904 Colbeck returned with Morning, this time with firm instructions that unless Discovery could be speedily released from the ice, she was to be abandoned; Colbeck was to bring Scott and the expedition home. In a race against time, and with a fortunate shift in ice conditions, Discovery was freed and sailed safely home.