| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1821 in topic |
|---|
| Humanities |
| Archaeology – Architecture – Art Literature – Music |
| By country |
| Australia – Belgium – Brazil – Canada – Denmark – France – Germany – Mexico – New Zealand – Norway – Philippines – Portugal – Russia – South Africa – Spain – Sweden – United Kingdom – United States – Venezuela |
| Other topics |
| Rail transport – Science – Sports |
| Lists of leaders |
| Sovereign states – State leaders – Territorial governors – Religious leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Works |
 | Wikimedia Commons has media related to 1821 . |
1821 ( MDCCCXXI ) was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar , the 1821st year of the Common Era (CE) and Anno Domini (AD) designations, the 821st year of the 2nd millennium , the 21st year of the 19th century , and the 2nd year of the 1820s decade. As of the start of 1821, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
