List of elections in 1866

• 1866 Chilean presidential election
• 1866 Costa Rican general election
• 1866 Honduran presidential election
• 1866 New Zealand general election

North America

Canada

• 1866 New Brunswick general election

Caribbean

• 1866 Dominican Republic general election

United States

• 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