| John Fenwick | |
| Constituency Mp: | Morpeth |
| Term Start: | November 1640 |
| Term End: | January 1644 (excluded) |
| Birth Date: | 14 January 1602 |
| Birth Place: | Wallington Hall Yorkshire |
| Death Place: | Long Marston, North Yorkshire |
| Nationality: | English |
| Spouse: | Mary Selby |
| Alma Mater: | Trinity College, Cambridge |
| Occupation: | MP and soldier |
| Allegiance: | Royalist |
| Rank: | Colonel |
| Unit: | Colonel John Fenwick’s Troop of Dragoons |
John Fenwick (14 January 1602 to 2 July 1644) was a Member of Parliament from Northumberland, killed serving in the Royalist army during the First English Civil War.
John Fenwick was the only son of Sir John Fenwick, 1st Baronet of Wallington Hall, Northumberland, and his first wife Katherine (1584-1616), sister to Sir Henry Slingsby, executed in 1658 for his part in a Royalist conspiracy.
He married Mary, daughter of Sir George Selby, of Whitehouse, County Durham.
Fenwick matriculated from Trinity College, Cambridge at Easter 1628. He was admitted at Gray's Inn on 28 April 1630.
In November 1640, Fenwick was elected Member of Parliament for Morpeth, Northumberland in the Long Parliament. In early 1644, he raised a troop of dragoons for the Royalist Northern Army; and was excluded from Parliament on 22 January 1644.
His troop was at the siege of Newcastle, and a skirmish near Corbridge in 1644. He was killed at the Battle of Marston Moor on 2 July 1644.