William Salmon (1644–1713) was an English empiric doctor and a writer of medical texts. He advertised himself as a "Professor of Physick". Salmon held an equivocal place in the medical community. He led apothecaries in opposing attempts by physicians to control the dispensing of medicines, and was derided by physicians as "the King of the Quacks". He has been described as "a brilliant publicist, but not much of a philosopher".