Editing 1858 (section)

=== January–June ===
[[File:Vicente Ramón Roca.jpg|thumb|110px|[[Vicente Ramón Roca]]]]
[[File:Jose de la Riva Aguero y Sanchez Boquete.jpg|thumb|110px|[[José de la Riva Agüero]]]]
* [[January 4]] – [[Amelia Griffiths]], English phycologist (b. [[1768]])
* [[January 5]] – [[Joseph Radetzky von Radetz]], Austrian field marshal (b. [[1766]])
* [[January 9]] – [[Anson Jones]], 4th and last [[President of the Republic of Texas]] (suicide) (b. [[1798]])
* [[February 21]] –  [[John K. Kane]], American politician and jurist (b. [[1795]])
* [[February 23]] – [[Vicente Ramón Roca]], 3rd [[President of Ecuador]] (b. [[1792]])
* [[March 4]] – Commodore [[Matthew Calbraith Perry]], American naval officer (b. [[1794]])
* [[March 13]] – [[Georgios Kountouriotis]], Prime Minister of Greece (b. [[1782]])
* [[April 7]] – [[Anton Diabelli]], Austrian composer (b. [[1781]])
* [[May 11]] – [[Joseph Gensoul]], French surgeon (b. [[1797]])
* [[May 21]] – [[José de la Riva Agüero]], Peruvian soldier and politician, 1st President of Peru and 2nd President of North Peru (b. [[1783]])
* [[June 3]] – [[Julius Reubke]], German composer (b. [[1834]])
* [[June 18]] – [[Rani of Jhansi]], Indian queen of Jhansi and independence activist (b. [[1828]])
* [[June 28]]
** [[Jane Marcet]], British science writer (b. [[1769]])<ref>{{cite DNB|wstitle=Marcet, Jane|volume=36}}</ref>
** [[Auguste de Montferrand]], French architect (b. [[1786]])