The following elections occurred in the year 1820.
Europe
- 1820 French legislative election
- 1820 Portuguese legislative election
- Spanish general election, 1820
- 1820 United Kingdom general election
North America
United States
- 1820 Missouri gubernatorial election
- 1820 New York gubernatorial election
- 1820 and 1821 United States House of Representatives elections
- 1820 United States presidential election
- United States Senate election in New York, 1819/1820
- 1820 and 1821 United States Senate elections