Editing 1903 (section)

===January–June===
[[File:Galg gem.jpg|thumb|110px|Saint [[Gemma Galgani]]]]
[[File:Josiah Willard Gibbs -from MMS-.jpg|thumb|110px|right|[[Josiah Willard Gibbs]]]]
[[File:Paul Gauguin 1891.png|thumb|110px|right|[[Paul Gauguin]]]]
[[File:Apolinario mabini PG.jpg|thumb|110px|right|[[Apolinario Mabini]]]]
[[File:AlejandroIDeSerbiaEn1900.jpg|thumb|110px|right|King [[Alexander I of Serbia]]]]
* [[January 3]] &ndash; [[Alois Hitler]], Austrian civil servant, father of [[Adolf Hitler]] (b. [[1837]])
* [[January 4]]  
** [[Alexander Aksakov]], Russian writer (b. [[1832]])
** [[Gulstan Ropert]], missionary (b. [[1839 in the United States|1839]])
** [[Topsy (elephant)|Topsy]], elephant (b. [[1875 in the United States|1875]])
* [[January 5]] &ndash; [[Práxedes Mateo Sagasta]], Spanish politician, eight-time prime minister (b. [[1825]])
* [[January 7]] – [[Robert Atkinson Davis]], businessman, politician and 4th [[Premier of Manitoba]] (b. [[1841 in Canada|1841]])
* [[January 17]] &ndash; [[Quintin Hogg (merchant)|Quintin Hogg]], British philanthropist (b. [[1845]])
* [[January 24]] &ndash; [[Petko Karavelov]], 4th [[Prime Minister of Bulgaria]] (b. [[1843]])
* [[January 28]]
** [[Augusta Holmès]], French composer (b. [[1847]])
** [[Robert Planquette]], French composer (b. [[1850]])
** [[John B. Allen]], U.S. Senator from Washington from 1889 to 1893 (b. [[1845 in the United States|1845]])
* [[February 1]] &ndash; Sir [[George Gabriel Stokes]], Irish mathematician, physicist (b. [[1819]])
* [[3 February|February 3]] – [[David George Ritchie]], Scottish philosopher (b. [[1853 in Scotland|1853]])
* [[February 4]] &ndash; [[Zhang Peilun]], Chinese naval commander and government official (b. [[1848]])
* [[February 7]] &ndash; [[James Glaisher]], English meteorologist, aeronaut (b. [[1809]])
* [[February 9]] &ndash; [[Charles Gavan Duffy (Australian politician)|Sir Charles Duffy]], Irish-born Australian politician, 8th [[Premier of Victoria]] (b. [[1816]])
* [[February 14]] &ndash; [[Archduchess Elisabeth Franziska of Austria]] (b. [[1831]])
* [[February 17]] &ndash; [[Joseph Parry]], Welsh composer (b. [[1841]])
* [[February 18]]
** [[Prince Komatsu Akihito]], [[Gensui (Imperial Japanese Army)|Field Marshal]], [[Imperial Japanese Army General Staff Office|Chief of the General Staff]] (b. [[1846]])
** [[Onoe Kikugorō V]], [[kabuki]] actor (b. [[1844]])
* [[February 21]] – [[Kate Vaughan]], British dancer and actress (b. [[1852]])
* [[February 22]] 
** [[Hugo Wolf]], Austrian composer (b. [[1860]])
** [[Victor Meirelles]], painter (b. [[1832 in Brazil|1832]])
* [[February 26]] &ndash; [[Richard Jordan Gatling]], American inventor (b. [[1818]])
* [[March 2]] &ndash; [[Rafael Zaldívar]], former [[President of El Salvador]] (b. [[1834]])
*[[March 3]] &ndash; [[Robert Sanford Foster]], Union Army general (b. [[1834]])
* [[March 4]] &ndash; [[Joseph Henry Shorthouse]], English novelist (b. [[1834]])
* [[March 5]] &ndash; [[Gaston Paris]], French scholar (b. [[1839]])
* [[March 7]] 
** [[István Bittó]], 7th prime minister of Hungary (b. [[1822]])
** [[John Studholme]], politician and farmer (b. [[1829]]).
* [[March 11]] &ndash; [[Lou Graham (Seattle madame)]], American brothel owner (b. [[1857]])
* [[March 13]] &ndash; [[George Granville Bradley]], English vicar, scholar (b. [[1821]])
* [[March 16]] &ndash; [[Roy Bean]], American justice of the peace (b. [[1825]])<ref>{{cite book |last1=Bogart |first1=Charles H. |editor1-last=Tenkotte |editor1-first=Paul A. |editor2-last=Claypool |editor2-first=James C. |title=The Encyclopedia of Northern Kentucky |date=2009 |publisher=University Press of Kentucky |isbn=978-0-8131-5996-6 |pages=69–70 |chapter-url=https://books.google.com/books?id=Zc0eBgAAQBAJ&pg=PA69 |chapter=Bean, Roy "Judge"}}</ref>
* [[March 20]] – [[Charles Godfrey Leland]], humorist, folklorist and poet (b. [[1824 in the United States|1824]])
* [[March 25]] &ndash; [[Hector MacDonald|Sir Hector MacDonald]], British army general (b. [[1853]])
* [[March 28]] &ndash; [[Émile Baudot]], French telegraph engineer (b. [[1845]])
* [[March 29]] – [[Gustavus Franklin Swift]], businessman (b. [[1839 in the United States|1839]])
* [[April 4]] &ndash; [[Margaret Ann Neve]], English supercentenarian (b. [[1792]])
* [[April 5]] – [[Tom Allen (boxer)|Tom Allen]], English boxer (b. [[1839]])
* [[April 11]] 
** [[Gemma Galgani]], Italian mystic, Catholic saint (b. [[1878]])
** [[Ronglu]], Manchu political and military leader of the late [[Qing dynasty]] (b. [[1836]])
* [[13 April|April 13]] – [[Moritz Lazarus]], German philosopher (born [[1824 in Germany|1824]])
* [[April 19]] &ndash; [[Oliver Mowat|Sir Oliver Mowat]], Canadian politician (b. [[1820]])
* [[April 22]] – [[Alexander Ramsey]], 2nd [[Governor of Minnesota]] from 1860 to 1863 and U.S. Senator from Minnesota from 1863 to 1875 (b. [[1815 in the United States|1815]])
* [[April 24]] – [[Walter Osborne]], Irish painter (b. [[1859]])
* [[April 27]] – [[William Travers (New Zealand politician)|William Travers]], lawyer, politician, explorer, and [[Natural history|naturalist]] in New Zealand (b. [[1819]])
* [[April 28]] 
** [[Frances Augusta Conant]], American journalist (b. [[1841]])
** [[Josiah Willard Gibbs]], American physical chemist (b. [[1839]])
** [[Saigō Tanomo]], Shinto priest, martial artist and former Samurai (b. 1830)
* [[April 29]] &ndash; [[Stuart Robson (actor)|Stuart Robson]], American stage actor, comedian (b. [[1836]])
* [[April 30]] – [[Emily Stowe]], first female doctor to practice in Canada and women's rights and [[suffrage]] activist (b. [[1831 in Canada|1831]])
* [[May 4]] &ndash; [[Gotse Delchev]], Macedonian  Bulgarian revolutionary (b. [[1872]])
* [[May 8]] &ndash; [[Paul Gauguin]], French painter (b. [[1848]])
* [[May 11]] – [[Vilhelm Kyhn]], painter and educator (b. [[1819 in Denmark|1819]])
* [[May 13]] &ndash; [[Apolinario Mabini]], Filipino political theoretician, [[Prime Minister of the Philippines]] (b. [[1864]])
* [[May 19]] – [[Carl Snoilsky]], poet (b. [[1841]])
* [[June 9]] &ndash; [[Gaspar Núñez de Arce]], Spanish poet (b. [[1834]])
* [[June 11]]
** [[Alexander I of Serbia|Alexander I]], [[King of Serbia]] (b. [[1876]])
** [[Nikolai Bugaev]], Russian mathematician (b. [[1837]])
** [[Draga Mašin]], Serbian queen consort (b. [[1861]])
* [[June 14]] &ndash; [[Carl Gegenbaur]], German anatomist (b. [[1826]])<ref>{{Cite EB1911|wstitle=Gegenbaur, Carl}}</ref>
* [[June 15]] &ndash; [[Joseph Abbott (New South Wales politician)|Joseph Abbott]], Australian wool-broker and politician (b. [[1843]])
* [[June 19]] 
* [[Herbert Vaughan]], English Catholic cardinal, archbishop (b. [[1832]])