William Peacock may refer to:
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William Peacock (businessman)
Peacock & Son was a tanning and wool-brokering business in the early days of South Australia. Three members of the family were notable public figures: William Peacock (c. 1790 – 20 January 1874) was a successful businessman and one of the colony ...
(1790–1874), Australian businessman and politician
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William Peacock (water polo) (1891–1948), British water polo player
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William D. Peacock (1933–1998), Native Canadian newspaper publisher
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William Peacock (biologist) (known as Jim Peacock, born 1937), Australian scientist
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Billy Peacock, boxer, see
United States national amateur boxing flyweight champions
{{hndis, Peacock, William