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| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
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| 1821 by topic |
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| Arts, history, and science |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
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.
Deaths
- January 4 – Elizabeth Ann Seton, American saint (b. 1774)
- February 23 – John Keats, British poet (b. 1795)
- March 13 – John Hunter, second Governor of New South Wales (b. 1737)
- May 5 – Napoleon I of France (b. 1769)
- May 19 – Camille Jordan, French politician (b. 1771)
- September 10 – Johann Dominicus Fiorillo, German painter and art historian