Sir John Fenwick, 3rd Baronet | |
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| Born | c1645 |
| Died | 28 January 1697 |
| Nationality | Kingdom of England |
| Occupation(s) | MP and Jacobite conspirator |
| Known for | executed for treason |
| Spouse | Mary Fenwick born |
| Parent | Sir William Fenwick |
Sir John Fenwick, 3rd Baronet (c. 1645 – 28 January 1697) was an English Army officer and politician. He succeeded to the Fenwick baronetcy after the death of his father, Sir William Fenwick. A supporter of the Jacobite cause, Fenwick was involved in a conspiracy to assassinate William III of England, and was executed by beheading in 1697 as a result.