| John Ennis Vivian | |
| Honorific-Suffix: | MP |
| Office: | Member of Parliament for Truro |
| Term Start: | 9 January 1835 |
| Term End: | 27 March 1857 |
| Alongside: | Henry Vivian (1852–1857) Humphrey Willyams (1849–1852) Edmund Turner (1837–1849) William Tooke (1835–1837) |
| Predecessor: | Hussey Vivian William Tooke |
| Successor: | Augustus Smith Edward Brydges Willyams |
| Birth Date: | 1787 |
| Death Date: | 24 May 1870 |
| Nationality: | British |
| Party: | Conservative |
John Ennis Vivian (1787 – 24 May 1870)[1] was a British Conservative politician.
Vivian was first elected as the Conservative MP for Truro at the 1835 general election and held the seat for 22 years, standing down at the 1857 general election.[2]