| Election Name: | 1840 New Jersey gubernatorial election |
| Country: | New Jersey |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1839 New Jersey gubernatorial election |
| Previous Year: | 1839 |
| Next Election: | 1841 New Jersey gubernatorial election |
| Next Year: | 1841 |
| Election Date: | 30 October 1840 |
| Nominee1: | William Pennington |
| Party1: | Whig Party (United States) |
| Popular Vote1: | 58 |
| Percentage1: | 100.00% |
| Governor | |
| Before Election: | William Pennington |
| Before Party: | Whig Party (United States) |
| After Election: | William Pennington |
| After Party: | Whig Party (United States) |
The 1840 New Jersey gubernatorial election was held on 30 October 1840 in order to elect the governor of New Jersey. Incumbent Whig governor William Pennington was re-elected by the New Jersey General Assembly as he ran unopposed.
On election day, 30 October 1840, incumbent Whig governor William Pennington was re-elected by the New Jersey General Assembly as he ran unopposed, thereby retaining Whig control over the office of governor. Pennington was sworn in for his fourth term that same day.