1821
| Árstal |
| 1818 1819 1820 – 1821 – 1822 1823 1824 |
| Áratíggju |
| 1810-árini – 1820-árini – 1830-árini |
| Øldir |
| 18. øld– 19. øld – 20. øld |
1821 (MDCCCXXI) var sambært gregorianska kalendaranum eitt vanligt ár, ið byrjaði á einum mánadegi.
Hendingar
- 25. mars - Grikkaland kunngjørdi at landið var sjálvstøðugt, tók loysing frá Osmanska Ríkinum, frælsisstríðið vardi tó nøkur ár afturat, áðrenn landið varð viðurkent sum sjálvstøðug tjóð (1830).
- Guatemala gerst sjálvstøðug tjóð
- 28. juli – Peru kunngjørdi at landið nú var sjálvstøðug tjóð
Føðingar
Andlát
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