Sir William Withey Gull, 1st Baronet (31 December 1816 - 29 January 1890), was a 19th-century English physician. Of modest family origins, he rose through the ranks of the medical profession to establish a lucrative private practice and serve in a number of prominent roles, including Governor of Guy's Hospital, Fullerian Professor of Physiology and President of the Clinical Society. In 1871, having successfully treated the Prince of Wales during a life-threatening attack of typhoid fever, he was created a Baronet and appointed to be one of the Physicians-in-Ordinary to HM Queen Victoria.