John Fenwick may refer to:
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John Fenwick (14th century MP) for
Northumberland (UK Parliament constituency)
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Sir John Fenwick, 1st Baronet (c. 1570–1658), English landowner
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John Fenwick (MP for Morpeth) (d. 1644), English politician and soldier who was killed at the Battle of Marston Moor
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John Fenwick (Quaker) (1618–1683), English founder of a Quaker colony in Salem, New Jersey
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John Fenwick (Jesuit) (c. 1628–1679), English Jesuit
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Sir John Fenwick, 3rd Baronet (c. 1645–1697), English Jacobite conspirator
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John Ralph Fenwick (1761–1855), English physician and radical
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John Fenwick Burgoyne Blackett (c. 1821–1856), British politician
;Also
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John Fenwicke (c. 1593–1670), supported the parliamentary cause during the English Civil War.
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John Fenwick Service Area, a service area for travelers using the New Jersey Turnpike
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