1821

Centuries:	18th century 19th century 20th century
Decades:	1800s 1810s 1820s 1830s 1840s
Years:	1818 1819 1820 1821 1822 1823 1824
Categories:	Births - Deaths Establishments - Publications
Media:	1821 (Events)

1821 was a common year of the Gregorian calendar and a common year of the Julian calendar, the 1821st year of the Common Era (CE), 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.