Young Giantess (1790–1811) was a British Thoroughbred racehorse and broodmare. She failed to win any of the five races she contested, but became a successful broodmare for Sir Charles Bunbury. She foaled the successful sire Sorcerer and Derby and Oaks winner Eleanor.

Sir Thomas Charles Bunbury, 6th Baronet was a British politician who sat in the House of Commons between 1761 and 1812. He was the first husband of Lady Sarah Lennox, and the breeder of Thoroughbred racehorses.