Year 1878 (MDCCCLXXVIII) was a common year starting on Tuesday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Sunday of the 12-day slower Julian calendar).
Events of 1878
January - March
April - June
July - September
October - December
Undated
Foundations:
Births
January - June
- January 6 - Carl Sandburg, American poet and historian (d. 1967)
- January 12 - Ferenc Molnár, author (d. 1952)
- January 25 - Ernst Alexanderson, Swedish-born television pioneer (d. 1975)
- February 1 - Milan Hodža, Slovak politician, champion of regional integration in Europe (d. 1944)
- February 2 - Alfréd Hajós, Hungarian swimmer and architect (d. 1955)
- February 5 - André Citroën, French automobile manufacturer (d. 1935)
- February 8 - Martin Buber, Austrian philosopher (d. 1965)
- February 14 - Hirota Koki, Prime Minister of Japan (d. 1948)
- February 21 - The Mother (Mirra Alfassa), multi-origined spiritual leader and founder of Auroville in India (d. 1973)
- February 26 - Emmy Destinn, Czech soprano (d. 1930)
- February 28 - Pierre Fatou, French mathematician (d. 1929)
- March 4
- March 16 - Clemens August Graf von Galen, German Catholic cardinal (d. 1946)
- March 22 - Michel Théato, Luxembourg athlete (d. 1919)
- March 31 - Jack Johnson, American boxer (d. 1946)
- April 6 - Erich Mühsam, German author (d. 1934)
- April 24 - Jean Crotti, Swiss artist (d. 1958)
- April 28
- May 3 - Cruz Hernandez, unverified claimant to be world's oldest person (d. 2007)
- May 10 - Gustav Stresemann, Chancellor of Germany, recipient of the Nobel Peace Prize (d. 1929)
- May 25 - Bill Robinson, African American tap dancer (d. 1949)
- May 26 - Isadora Duncan, American dancer (d. 1927)
- May 28 - Paul Pelliot, French sinologist (d. 1945)
- June 1 - John Masefield, English poet and novelist (d. 1967)
- June 3 - Barney Oldfield, American automobile racer and pioneer (d. 1946)
- June 5 - Pancho Villa, Mexican revolutionary (d. 1923)
July - December
- July 4 - George M. Cohan, American singer, dancer, composer, actor, and writer (d. 1942)
- July 24 - Edward Plunkett, Baron Dunsany, Irish author (d. 1957)
- August 10 - Alfred Döblin, German writer (d. 1957)
- August 28 - George Whipple, American scientist, recipient of the Nobel Prize in Physiology or Medicine (d. 1976)
- August 31 - Frank Jarvis, American athlete (d. 1933)
- September 5 - Robert von Lieben, Austrian physicist (d. 1913)
- September 13 - Matilde Moisant, American pilot (d. 1964)
- September 20 - Upton Sinclair, American writer (d. 1968)
- September 22 - Yoshida Shigeru, Prime Minister of Japan (d. 1967)
- September 24 - C. F. Ramuz, Swiss writer (d. 1947)
- October 1 - Othmar Spann, Austrian philosopher and economist (d. 1950)
- October 16 - Maxey Long, American athlete (d. 1959)
- November 1 - Carlos Saavedra Lamas, Argentine politician, recipient of the Nobel Peace Prize (d. 1959)
- November 14 - Leopold Staff, Polish poet (d. 1957)
- November 17 - Grace Abbott, American social worker and activist (d. 1939)
- December 18 - Joseph Stalin, Soviet leader (d. 1953)
- December 25
- December 28 - Nikolai Bryukhanov, Soviet statesman and political figure who served as People's Commissar of Finances (d. 1938)
- December 31 - Elizabeth Arden, Canadian-born beautician and cosmetics entrepreneur (d. 1966)
- December 31 - Horacio Quiroga, Argentinian writer (d. 1937)
Deaths
January - June
- January 8 - 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 19 - Charles-Francois Daubigny, French painter (b. 1817)
- February 26 - Angelo Secchi, Italian astronomer (b. 1818)
- March 8 - Archduke Franz Karl of Austria (b. 1802)
- April 8 - Henrietta Treffz, soprano, first wife of Johann Strauss II (b. 1818)
- April 12 - William Marcy Tweed, American politician (b. 1823)
- April 25 - Anna Sewell, English author (b. 1820)
- May 28 - John Russell, 1st Earl Russell, Prime Minister of the United Kingdom (b. 1792)
- June 6
- June 12
July - December
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