|Centuries:||19th century - 20th century|
|Decades:||1790s 1800s 1810s - 1820s - 1830s 1840s 1850s|
|Years:||1820 1821 1822 1823 1824 1825 1826 1827 1828 1829|
- September 21 - Joseph Smith visited by the Angel Moroni.
- September 21 - D&C 2 recorded by Joseph Smith in Manchester, New York.
- November 19 - Alvin Smith dies at the age of 25 from an overdose of calomel.