1820
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| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| 1820 by topic |
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| Arts, history, and science |
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| Countries |
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| Lists of leaders |
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| Birth and death categories |
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| Establishments and disestablishments categories |
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| Works category |
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| Gregorian calendar | 1820 MDCCCXX |
| Ab urbe condita | 2573 |
| Armenian calendar | 1269 ԹՎ ՌՄԿԹ |
| Assyrian calendar | 6570 |
| Balinese saka calendar | 1741–1742 |
| Bengali calendar | 1227 |
| Berber calendar | 2770 |
| British Regnal year | 60 Geo. 3 – 1 Geo. 4 |
| Buddhist calendar | 2364 |
| Burmese calendar | 1182 |
| Byzantine calendar | 7328–7329 |
| Chinese calendar | 己卯年 (Earth Rabbit) 4516 or 4456 — to — 庚辰年 (Metal Dragon) 4517 or 4457 |
| Coptic calendar | 1536–1537 |
| Discordian calendar | 2986 |
| Ethiopian calendar | 1812–1813 |
| Hebrew calendar | 5580–5581 |
| Hindu calendars | |
| - Vikram Samvat | 1876–1877 |
| - Shaka Samvat | 1741–1742 |
| - Kali Yuga | 4920–4921 |
| Holocene calendar | 11820 |
| Igbo calendar | 820–821 |
| Iranian calendar | 1198–1199 |
| Islamic calendar | 1235–1236 |
| Japanese calendar | Bunsei 3 (文政３年) |
| Javanese calendar | 1747–1748 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4153 |
| Minguo calendar | 92 before ROC 民前92年 |
| Nanakshahi calendar | 352 |
| Thai solar calendar | 2362–2363 |
| Tibetan calendar | ས་མོ་ཡོས་ལོ་ (female Earth-Hare) 1946 or 1565 or 793 — to — ལྕགས་ཕོ་འབྲུག་ལོ་ (male Iron-Dragon) 1947 or 1566 or 794 |
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1820 (MDCCCXX) was a leap year starting on Saturday in the Gregorian calendar and a leap year starting on Thursday in the Julian calendar.
Events
- Venus de Milo is discovered.
- Hans Christian Ørsted discovers the relationship between electricity and magnetism.
Births
- March 22 – John Brown, English cricketer (died 1893)
- May 12 – Florence Nightingale, Italian-born English nurse (died 1910)
- date unknown
- Anne Bronte, English novelist (died 1849)
- King Victor Emmanuel II of Italy (died 1873)
- Joseph Whitaker, English publisher (died 1896)
Deaths
- George III of the United Kingdom (b. 1738)
- Daniel Boone (b. 1734)