William Masters (1915–2001) was an American gynecologist, of the Masters and Johnson sexuality research team.

William Masters may refer to:

William Masters (rugby union) (1858–1897), Scottish rugby union player William Masters (politician) (1820–1906), American farmer, pioneer, and politician in Wisconsin William Masters (botanist) (1796–1874), English nurseryman, garden designer, and amateur botanist Gordon Stretton (1887–1983), born William Masters, English and Argentine musician William Masters (engineer) William A. Masters (economist)

See also Billy Masters (disambiguation)