– Nikolay Nekrasov, Russian poet (b. 1821) January 9 – King Victor Emmanuel II of Italy (b. 1820) January 18 – Antoine César Becquerel, French scientist (b. 1788) February 7 – Pope Pius IX (b. 1792) February 11 – Gideon Welles, American politician (b. 1802) February 18 – John Tunstall, American rancher, merchant, first man killed in the Lincoln County War (b. 1853) February 19 – Charles-François Daubigny, French painter (b. 1817) February 26 – Angelo Secchi, Italian astronomer (b. 1818) March 8 – Archduke Franz Karl of Austria (b. 1802) March 20 – Julius von Mayer, German physician, physicist and one of the founders of thermodynamics (b. 1814) March 27 – Sir George Gilbert Scott, British architect (b. 1811) April 4 – Richard M. Brewer, American gunslinger, cowboy (b. 1850) April 5 – Buckshot Roberts, American buffalo hunter who killed Richard M. Brewer (shot) (b. 1831) April 8 – Henrietta Treffz, Austrian soprano, first wife of Johann Strauss II (b. 1818) April 11 – Robert Wentworth Little, British occultist (b. 1840) April 12 – William M. Tweed, American politician (b. 1823) April 25 – Anna Sewell, English author (b. 1820) May 11 – Pierre Philippe Denfert-Rochereau, French military officer and politician (b. 1823) May 12 – Anselme Payen, French chemist (b. 1795) May 13 – Joseph Henry, American scientist (b. 1797) May 14 – Ōkubo Toshimichi, Japanese samurai, later leader of the Meiji restoration (b. 1830) May 28 – John Russell, 1st Earl Russell, Prime Minister of the United Kingdom (b. 1792) June 5 – Ernst von Bibra, German scientist (b. 1806) June 6 Achille Baraguey d'Hilliers, Marshal of France (b. 1795) Robert Stirling, Scottish clergyman, inventor (b. 1790) June 12 Queen Cheorin, Korean queen consort (b. 1837) George V of Hanover (b. 1819) June 15 – Shiv Dayal Singh Founder and first SatGuru of Radha Soami Faith (b. 1818) June 27 – Sidney Breese, U.S. senator from Illinois, father of the Illinois Central Railroad (b. 1800) July–December July 1 – Catherine Winkworth, English translator of hymns (b. 1827) July 17 – Aleardo Aleardi, Italian poet (b. 1812) July 23 – Carl Freiherr von Rokitansky, Bohemian pathologist, philosopher and politician (b. 1804) August 13 – Henry James Montague, English-born actor (b. 1844) August 16 – Richard Upjohn, English-American architect (b. 1802) August 26 – Mariam Baouardy, Syrian Discalced Carmelite and Melkite Greek Catholic nun and saint, canonized (b. 1846)