The 1867 Manuherikia by-election was a by-election held on 29 November 1864 in the electorate during the 4th New Zealand Parliament.
The by-election was caused by the resignation of the incumbent MP William Baldwin on 15 February 1867.
The by-election was contested by David Mervyn and John Jack. When Jack won the "show of hands" at the nomination meeting, the by-election was demanded and won by Mervyn.