The following elections occurred in the year 1866.
- 1866 Chilean presidential election
- 1866 Costa Rican general election
- 1866 Honduran presidential election
- 1866 New Zealand general election
North America
[edit]Canada
[edit]Caribbean
[edit]United States
[edit]- United States House of Representatives elections in California, 1866
- 1866 New Orleans mayoral election
- 1866 New York state election
- 1866 and 1867 United States House of Representatives elections
- 1866 and 1867 United States Senate elections