| Election Name: | 1805 New Hampshire gubernatorial election |
| Country: | New Hampshire |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1804 New Hampshire gubernatorial election |
| Previous Year: | 1804 |
| Next Election: | 1806 New Hampshire gubernatorial election |
| Next Year: | 1806 |
| Election Date: | March 12, 1805 |
| Nominee1: | John Langdon |
| Party1: | Democratic-Republican Party (United States) |
| Popular Vote1: | 16,097 |
| Percentage1: | 56.59% |
| Nominee2: | John Taylor Gilman |
| Party2: | Federalist Party (United States) |
| Popular Vote2: | 12,287 |
| Percentage2: | 43.20% |
| Governor | |
| Before Election: | John Taylor Gilman |
| Before Party: | Federalist Party (United States) |
| After Election: | John Langdon |
| After Party: | Democratic-Republican Party (United States) |
The 1805 New Hampshire gubernatorial election took place on March 12, 1805. Incumbent Federalist Governor John Taylor Gilman was defeated for re-election by Democratic-Republican candidate, former Governor and U.S. Senator John Langdon in a re-match of the previous year's election.