1866 New Hampshire gubernatorial election

The 1866 New Hampshire gubernatorial election was held on 13 March 1866 in order to elect the Governor of New Hampshire. Incumbent Republican Governor Frederick Smyth won re-election against Democratic nominee John G. Sinclair.

General election
On election day, 13 March 1866, incumbent Republican Governor Frederick Smyth won re-election by a margin of 4,656 votes against his opponent Democratic nominee John G. Sinclair, thereby retaining Republican control over the office of Governor. Smyth was sworn in for his second term on 5 June 1866.