William Hilliard may refer to:
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William Hilliard (bishop) (1887–1960), Anglican bishop of Nelson
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William Hilliard (English MP) (died 1608), English Member of Parliament
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William Hilliard (Florida politician), served as Mayor of Tallahassee
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William Hilliard (publisher) (1778–1836), American publisher and bookseller in Massachusetts
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William A. Hilliard (1927–2017), American journalist
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William L. Hilliard (1868–1966), Canadian physician and politician in Ontario
{{hndis, Hilliard, William