William Schwartz may refer to:
- William Schwartz (law professor) (born 1933), American law professor and corporate director
- William Schwartz (physician) (1922–2009), nephrologist
- William Bernstein Schwartz Jr. (1922–2010), American businessman and United States Ambassador to the Bahamas
- William C. Schwartz (1927–2000), civic leader in Central Florida and laser industry pioneer
- William J. Schwartz (born 1950), American neurologist and professor
- William S. Schwartz (1896–1977), American artist
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