The following elections occurred in 1966.
- 1966 Indialection
- 1966 Fianna Fáil leadership election
- 1966 Finnish parliamentary election
- 1966 Gambian general election
- 1966 Guatemalan general election
- 1966 Maltese general election
- 1966 Salvadoran legislative election
- 1966 South African general election
- Gambian general election
- Kenyan parliamentary by-elections
- Mauritanian presidential election
- South African general election
- Cambodian general election
- Indian Rajya Sabha elections
- Mongolian legislative election
- Singaporean by-elections
- South Vietnamese Constitutional Assembly election
- Soviet Union legislative election
- Turkish Senate election
- 1966 Taiwan presidential election
- Albanian parliamentary election
- Bulgarian parliamentary election
- Danish general election
- Danish regional elections
- Faroese general election
- Fianna Fáil leadership election
- Finnish parliamentary election
- 1966 Irish presidential election
- Liechtenstein general election
- 1966 Maltese general election
- 1966 Soviet Union legislative election
- United Kingdom general election
- 1966 Hamburg state election
- 1966 North Rhine-Westphalia state election ( de)
- 1966 Hesse state election ( de)
- 1966 Bavarian state election ( de)
- 1966 United Kingdom general election
- List of MPs elected in the 1966 United Kingdom general election
- 1966 British Columbia general election
- 1966 Edmonton municipal election
- 1966 Manitoba general election
- 1966 Newfoundland general election
- 1966 Ottawa municipal election
- 1966 Prince Edward Island general election
- 1966 Quebec general election
- 1966 Toronto municipal election
- 1966 Barbadian general election
- Dominican general election
- Dominican Republic general election
- Montserratian general election
- Saint Kitts-Nevis-Anguilla general election
- 1966 Trinidad and Tobago general election
- Saint Vincent and the Grenadines: general election
- 1966 United States Senate elections
- 1966 Arkansas gubernatorial election
- United States House of Representatives elections in California, 1966
- 1966 California gubernatorial election
- 1966 Maine gubernatorial election
- 1966 Minnesota gubernatorial election
- United States House of Representatives elections in South Carolina, 1966
- 1966 South Carolina gubernatorial election
- 1966 United States House of Representatives elections
The following elections occurred in 1966.
- 1966 Indialection
- 1966 Fianna Fáil leadership election
- 1966 Finnish parliamentary election
- 1966 Gambian general election
- 1966 Guatemalan general election
- 1966 Maltese general election
- 1966 Salvadoran legislative election
- 1966 South African general election
- Gambian general election
- Kenyan parliamentary by-elections
- Mauritanian presidential election
- South African general election
- Cambodian general election
- Indian Rajya Sabha elections
- Mongolian legislative election
- Singaporean by-elections
- South Vietnamese Constitutional Assembly election
- Soviet Union legislative election
- Turkish Senate election
- 1966 Taiwan presidential election
- Albanian parliamentary election
- Bulgarian parliamentary election
- Danish general election
- Danish regional elections
- Faroese general election
- Fianna Fáil leadership election
- Finnish parliamentary election
- 1966 Irish presidential election
- Liechtenstein general election
- 1966 Maltese general election
- 1966 Soviet Union legislative election
- United Kingdom general election
- 1966 Hamburg state election
- 1966 North Rhine-Westphalia state election ( de)
- 1966 Hesse state election ( de)
- 1966 Bavarian state election ( de)
- 1966 United Kingdom general election
- List of MPs elected in the 1966 United Kingdom general election
- 1966 British Columbia general election
- 1966 Edmonton municipal election
- 1966 Manitoba general election
- 1966 Newfoundland general election
- 1966 Ottawa municipal election
- 1966 Prince Edward Island general election
- 1966 Quebec general election
- 1966 Toronto municipal election
- 1966 Barbadian general election
- Dominican general election
- Dominican Republic general election
- Montserratian general election
- Saint Kitts-Nevis-Anguilla general election
- 1966 Trinidad and Tobago general election
- Saint Vincent and the Grenadines: general election
- 1966 United States Senate elections
- 1966 Arkansas gubernatorial election
- United States House of Representatives elections in California, 1966
- 1966 California gubernatorial election
- 1966 Maine gubernatorial election
- 1966 Minnesota gubernatorial election
- United States House of Representatives elections in South Carolina, 1966
- 1966 South Carolina gubernatorial election
- 1966 United States House of Representatives elections