| John Dennistoun | |
| Office: | Member of Parliament for |
| Term Start: | 27 May 1837 |
| Term End: | 31 July 1847 |
| Predecessor: | James Oswald William Bentinck |
| Successor: | John MacGregor Alexander Hastie |
| Alongside: | William Bentinck (1837–1839) James Oswald (1839–1847) |
| Birth Date: | 1803 |
| Nationality: | British |
| Party: | Whig |
John Dennistoun (19 March 1803 – 9 September 1870)[1] was a British Whig politician and banker.[2]
A member of Brooks's, he was elected Whig MP for at a by-election in 1837—caused by the resignation of James Oswald—and held the seat until 1847 when he was defeated.[2] [3]
His wife Frances was the daughter of Sir Henry Onslow. His brother Alexander Dennistoun was Whig MP for from 1835 to 1837.[2] [4]