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.
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Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic-Republican | John Langdon | 16,097 | 56.59% | ||
| Federalist | John Taylor Gilman (incumbent) | 12,287 | 43.20% | ||
| Scattering | 59 | 0.21% | |||
| Majority | 3,810 | 13.39% | |||
| Turnout | 28,443 | 100.00% | |||
| Democratic-Republican gain from Federalist | Swing | ||||