1821

Year 1821 () was a (link will display the full calendar) of the  (or a  of the 12-day slower ).

January - March

 * - sworn in as, for second term.
 * / -  declares its liberation from the, beginning the.

April - June

 * - dies in exile at . The cause of his death is still disputed.
 * -, king of , king of , surrenders his throne and realm to , general of the , ending the existence of that Sudanese kingdom.
 * - Decisive defeat of the by the  at  (in ).
 * - wins the, ensuring 's independence from . (See .)

July - September

 * - The takes possession of its newly-bought territory of  from.
 * - is crowned king of the
 * - declares independence from . (See ).
 * - is admitted as the 24th . (See .)
 * - Greek rebels massacre 3.000 inhabitants of the city of Navarino.
 * - is discovered by the crew of the Eliza Frances.
 * - The (a  covering much of presentday, , , and ) was established, with  as the founding  and  as.
 * - -  Greeks rebels massacre all Turkish and Jewish inhabitants of the city. (see.: )
 * -, , , and  gain independence from . (See )
 * - is founded.
 * - gains its independence from . (See .)

October - December

 * - the first  holds classes in.
 * - : used by first.
 * - declares independence from . (See ).

January - June

 * , American Confederate general (d. )
 * , American Civil War general (d. )
 * -, first American female physician (d. )
 * , writer (d. )
 * , French Egyptologist (d. )
 * -, Irish Spanish dancer and royal mistress (d. )
 * -, German linguist (d. )
 * -, German bishop (d. )
 * -, Scottish theologian (d. )
 * - English mystic (d. )
 * -, French poet and writer (d. )
 * -, American entrepreneur (d. )
 * -, Russian mathematician (d. )
 * -, German naturopath (d. )
 * -, Russian mathematician (d. )
 * -, German naturopath (d. )

July - December

 * -, French archaeologist (d. )
 * -, French mezzo-soprano and composer (d. )
 * -, American financier (d. )
 * - African-American minister and politician (d. )
 * -, German physician, pathologist, biologist, and politician (d. )
 * -, Russian writer (d. )
 * -,  (d. )
 * -, French writer (d. )
 * -, First president of American Red Cross (d. )
 * , Canadian politician (d. )


 * See also .

January - June

 * -, American saint (b. )
 * -, prince of Moldavia (b. )
 * -, British poet (b. )
 * - (b.), daughter of.
 * -, second Governor of New South Wales (b. )
 * - (b. )
 * -, French politician (b. )
 * -, Wallachian rebellion-leader (b. cca. )
 * - Argentine military leader (b. )
 * -, viceroy of Peru (b. )

July - December

 * -, German painter and art historian
 * -, mother to famous British authors Charlotte and Emily Brontë
 * -, viceroy of New Spain (b. )
 * - commissioned officer in the Continental Army, judge, lawyer and the father of  (b. )
 * -, French general (b. )
 * -, king of Tahiti
 * -, female soldier (b. )


 * See also .