William Jenner, 1st Baronet (January 30, 1815 - December 11, 1898) was an English physician. In 1847 he began at the London Fever Hospital investigations into cases of continued fever which enabled him finally to make the distinction between typhus and typhoid on which his reputation as a pathologist principally rests, publishing his book "On the Identity or Non-identity of Typhoid and Typhus Fever" in 1850. In 1861 he was appointed Physician Extraordinary, and in 1862 Physician in Ordinary, to Queen Victoria, and in 1863 Physician in Ordinary to the Prince of Wales. He attended both the prince consort and the prince of Wales in their attacks of typhoid fever. He was elected President of the Epidemiological Society in 1866-1868, of the Pathological Society in 1873-1875 and of the Clinical Society in 1875. He was president of the Royal College of Physicians from 1881 to 1888. He had a great reputation as a consultant. He retired in 1890 due to ill health and died in 1898 at the age of 83.