| Election Name: | 1842 Louisiana gubernatorial election |
| Country: | Louisiana |
| Type: | presidential |
| Ongoing: | No |
| Previous Election: | 1838 Louisiana gubernatorial election |
| Previous Year: | 1838 |
| Next Election: | 1846 Louisiana gubernatorial election |
| Next Year: | 1846 |
| Election Date: | July 6, 1842 |
| Flag Image: | Flag of the United States (1837–1845).svgborder |
| Nominee1: | Alexandre Mouton |
| Party1: | Democratic Party (United States) |
| Electoral Vote1: | 60 |
| Popular Vote1: | 9,669 |
| Percentage1: | 54.40% |
| Nominee2: | Henry S. Johnson |
| Party2: | Whig Party (United States) |
| Electoral Vote2: | 2 |
| Popular Vote2: | 8,104 |
| Percentage2: | 45.60% |
| Governor | |
| Before Election: | Andre B. Roman |
| Before Party: | Whig Party (United States) |
| After Election: | Alexandre Mouton |
| After Party: | Democratic Party (United States) |
The 1842 Louisiana gubernatorial election was the ninth gubernatorial election to take place after Louisiana achieved statehood. Under Article III Sec 2 of the 1812 Constitution of the State of Louisiana the Governor was elected in two steps. On the first Monday in July, eligible voters went to the polls and voted. The returns were sent to the President of the Louisiana State Senate. On the second day of the session of the Louisiana State Legislature, the Louisiana House of Representatives and Senate met in joint session and voted between the top two candidates. The candidate who received a majority in General Assembly became governor. This was the last election held under the Constitution of 1812, the next election was held under the Constitution of 1845.
Popular Vote[1]
| Party | Candidate | Votes received | Percentage |
|---|---|---|---|
| Democratic | Alexandre Mouton | 9,660 | 54.40% |
| Whig | Henry S. Johnson | 8,104 | 45.60% |
| Total Vote | 17,773 | ||
General Assembly Vote[1]
| Candidate | Votes received | Percentage |
|---|---|---|
| Alexandre Mouton | 60 | 85.71% |
| Henry S. Johnson | 2 | 2.82% |
| Blank | 9 | 12.68% |
| Total Vote | 71 | |