New Brunswick general election, 1866

The New Brunswick general election of 1866 was held in May and June 1866 to elect 41 members to the 21st New Brunswick Legislative Assembly. This was the 21st general election for the British colony of New Brunswick, but is considered the 1st general election for the Canadian province of New Brunswick.

Of forty-one MLAs, thirty-three were confederationalists, supporting confederation, and eight were constitutionalists, opposed to confederation, who formed the opposition.