View source for 1858

=== January–March ===
* [[January 9]]
** [[Revolt of Rajab Ali]]: British forces finally defeat Rajab Ali Khan of [[Chittagong]].<ref name=sen>{{Cite book |last=Sen|first=Satyen|language=bn|trans-title=Story of the great rebellion|title=মহাবিদ্রোহের কাহিনী|pages=155–159}}</ref>
** [[Anson Jones]], the last president of the [[Republic of Texas]], commits suicide.
* [[January 14]] &ndash; [[Orsini affair]]: Piedmontese revolutionary [[Felice Orsini]] and his accomplices fail to assassinate [[Napoleon III]] in Paris, but their [[Orsini bomb|bomb]]s kill eight and wound 142 people. Because of the involvement of French émigrés living in Britain, there is a brief anti-British feeling in France, but the emperor refuses to support it. 
* [[January 25]] &ndash; The ''[[Wedding March (Mendelssohn)|Wedding March]]'' by [[Felix Mendelssohn]] becomes a popular wedding recessional, after it is played on this day at the marriage of [[Queen Victoria]]'s daughter [[Victoria, Princess Royal]], to [[Frederick III, German Emperor|Prince Friedrich of Prussia]] in [[St James's Palace]], London.<ref name="Pocket On This Day"/>
* [[January]]
**[[Benito Juárez]] becomes the Liberal [[President of Mexico]]<ref>{{cite web|title=Benito Juarez |url=https://www.biografiasyvidas.com/biografia/j/juarez.htm|language=es|access-date=June 8, 2019}}</ref> and its first indigenous president. At the same time, the [[conservatives]] installed [[Félix María Zuloaga]] as a rival president.<ref name="robles" />
**[[Wilhelm I|Prince Wilhelm of Prussia]] becomes [[regent]] for his brother, King [[Frederick William IV]], who has suffered a stroke.<ref name=DHM>{{cite web |url=http://www.dhm.de/lemo/biografie/biografie-wilhelm-i.html |title=Biografie Wilhelm I |language=German |publisher=Deutsches Historisches Museum |access-date=12 June 2013 }}</ref> After Prince William's term acting as a  regent for the King had been extended three times, the ailing Frederick William signed a regency charter for him on 7 October 1858, based on an expert opinion from the royal personal physicians.<ref>{{Cite news |date=11 October 1858 |title=Aus Preußen |language=de |trans-title=From Prussia |page=1 |work=Wiener Zeitung |url=https://anno.onb.ac.at/cgi-content/anno?apm=0&aid=wrz&datum=18581011&seite=1}}</ref>
* [[February]]
* [[Queen Victoria]] announces her choice of [[Ottawa]] as capital of the [[Province of Canada]].
* [[February 11]] &ndash; [[Lourdes apparitions]]: Pauper girl [[Bernadette Soubirous]] of [[Lourdes]], fourteen, has a [[Vision (spirituality)|vision]] at the grotto of Massabielle, the first in a series of eighteen events which will come to be regarded as [[Marian apparition]]s.
* [[February 13]] &ndash; [[Richard Francis Burton]] and [[John Hanning Speke]] become the first Europeans to discover [[Lake Tanganyika]].<ref name="Pocket On This Day">{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}}</ref>
* [[March 13]] &ndash; [[Felice Orsini]] is executed by [[guillotine]] for the attempted assassination of [[Napoleon III]] of France.
* [[March 21]] &ndash; [[Indian Rebellion of 1857|Indian Rebellion]]: British troops retake [[Lucknow]].
* [[March 30]] &ndash; [[Hymen Lipman]] patents a [[pencil]] with an attached [[eraser]] in the United States.