|Centuries:||18th century - 19th century - 20th century|
|Decades:||1810s 1820s 1830s - 1840s - 1850s 1860s 1870s|
|Years:||1840 1841 1842 1843 1844 1845 1846 1847 1848 1849|
- May 27 - Millennial Star first published in Manchester, England.
- June 6 - The first group of Mormon emigrants from Europe board the Britannia at Liverpool, England, and sailed for New York.
- December 16 - Governor Thomas Carlin of Illinois signs the bill granting the Nauvoo Charter.
- September 14 - Joseph Smith, Sr., dies.