William Dietz may refer to:
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William C. Dietz (born 1945), science fiction author
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William Dietz (politician) (1778–1848), U.S. Representative from New York
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William Henry Dietz
William Henry "Lone Star" Dietz (August 17, 1884 – July 20, 1964) was an American football player and coach. He served as the head football coach at Washington State University (1915–1917), Purdue University (1921), Louisiana Tech University ( ...
(1884–1964), American football player and coach
{{hndis, Dietz, William