| in?=
| cp=18th century
| c=19th century
| cf=20th century
| yp1=1818
| yp2=1819
| yp3=1820
| year=1821
| ya1=1822
| ya2=1823
| ya3=1824
| dp3=1790s
| dp2=1800s
| dp1=1810s
| d=1820s
| dn1=1830s
| dn2=1840s
| dn3=1850s
}}
1821 was a Common Year Starting On Monday (see link for calendar).
Events
Births
- January 8 - James Longstreet , American Confederate general (d. 1904 )
- January 8 - W.H.L. Wallace , American Civil War general (d. 1862 )
- February 3 - Elizabeth Blackwell , first American female physician (d. 1910 )
- February 11 - Hermann Allmers , writer (d. 1902 )
- February 11 - Auguste Edouard Mariette , French Egyptologist (d. 1881 )
- February 17 - Lola Montez , Irish Spanish dancer and royal mistress (d. 1861 )
- February 19 - August Schleicher , German linguist (d. 1868 )
- March 1 - Joseph Hubert Reinkens , German Old Catholic bishop (d. 1896 )
- April 3 - Fr. Thomas Pelham Dale SSC , Anglican Clergyman prosecuted for Ritualist practices in the 1870s (d. 1892 )
- April 9 - Charles-Pierre Baudelaire , French poet and writer (d. 1867 )
- May 8 - William Henry Vanderbilt , American entrepreneur (d. 1885 )
- May 16 - Pafnuty Chebyshev , Russian mathematician (d. 1894 )
- May 17 - Sebastian Kneipp , German naturopath (d. 1897 )
- July 1 - Anatole Jean-Baptiste Antoine De Barthélemy , French archaeologist (d. 1904 )
- July 18 - Pauline Garcia-Viardot , French mezzo-soprano and composer (d. 1910 )
- August 10 - Jay Cooke , American financier (d. 1905 )
- October 13 - Rudolf Virchow , German physician, pathologist, biologist, and politician (d. 1902 )
- November 11 - Fyodor Dostoevsky , Russian writer (d. 1881 )
- December 12 - Gustave Flaubert , French writer (d. 1880 )
- December 25 - Clara Barton , First president of American Red Cross (d. 1912 )
- Sir John Joseph Caldwell Abbott , Canadian politician (d. 1893 )
- Frederick Temple , Archbishop Of Canterbury (d. 1902 )
Deaths
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