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.

Millennium:	2nd millennium
Centuries:	18th century – 19th century – 20th century
Decades:	1790s  1800s  1810s  – 1820s –  1830s  1840s  1850s
Years:	1818 1819 1820 – 1821 – 1822 1823 1824

1821 in other calendars

Gregorian calendar	1821 MDCCCXXI
Ab urbe condita	2574
Armenian calendar	1270 ԹՎ ՌՄՀ
Assyrian calendar	6571
Balinese saka calendar	1742–1743
Bengali calendar	1228
Berber calendar	2771
British Regnal year	1 Geo. 4 – 2 Geo. 4
Buddhist calendar	2365
Burmese calendar	1183
Byzantine calendar	7329–7330
Chinese calendar	庚辰年 (Metal Dragon) 4517 or 4457     — to — 辛巳年 (Metal Snake) 4518 or 4458
Coptic calendar	1537–1538
Discordian calendar	2987
Ethiopian calendar	1813–1814
Hebrew calendar	5581–5582
Hindu calendars
- Vikram Samvat	1877–1878
- Shaka Samvat	1742–1743
- Kali Yuga	4921–4922
Holocene calendar	11821
Igbo calendar	821–822
Iranian calendar	1199–1200
Islamic calendar	1236–1237
Japanese calendar	Bunsei 4 (文政４年)
Javanese calendar	1748–1749
Julian calendar	Gregorian minus 12 days
Korean calendar	4154
Minguo calendar	91 before ROC 民前91年
Nanakshahi calendar	353
Thai solar calendar	2363–2364
Tibetan calendar	阳金龙年 (male Iron-Dragon) 1947 or 1566 or 794     — to — 阴金蛇年 (female Iron-Snake) 1948 or 1567 or 795

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