Year 1925 (MCMXXV) was a common year starting on Thursday (link will display the full calendar) of the Gregorian calendar.
Events of 1925
- March 4 - Calvin Coolidge becomes the first President of the United States to have his inauguration broadcasted on radio.
- March 6 - Pionerskaya Pravda, one of the oldest children's newspapers in Europe, is founded
- March 13 - Scopes Trial: A law in Tennessee prohibits the teaching of evolution.
- March 15 - Phi Lambda Chi fraternity founded, under their original name "The Aztecs", on the campus of Arkansas State Teacher's College in Conway, Arkansas, now known as the University of Central Arkansas.
- March 18 - The Tri-State Tornado rampages through Missouri, Illinois, and Indiana and kills 695 people and injures 2027. It hits the towns Murphysboro, Illinois; Gorham, Illinois; Ellington, Missouri; and Griffin, Indiana
- March 21 - Tennessee Governor Austin Peay signs the Butler Act, prohibiting the teaching of evolution in the state's public schools.
- March 31 - WOWO radio station in Ft. Wayne, Indiana begins broadcasting.
- April 1 - Frank Heath and his horse Gypsy Queen leave Washington, D.C. to begin a two-year journey to visit all 48 states.
- April 10 - F. Scott Fitzgerald publishes The Great Gatsby
- April 16 - The Communist St Nedelya Church assault claims the lives of 150 and injures 500 in the Bulgarian capital, Sofia.
- June 1 - Percy and Florence Arrowsmith are married. This couple, who celebrated their 80th wedding anniversary June 1, 2005 (Percy aged 105, and wife Florence 100), are acknowledged by the Guinness Book of Records as record-holders for the longest marriage for a living couple and the greatest aggregate age of a married couple.
- June 6 - The Chrysler Corporation is founded by Walter Percy Chrysler.
- June 13 - Charles Francis Jenkins achieves the first synchronized transmission of pictures and sound, using 48 lines, and a mechanical system. A 10-minute film of a miniature windmill in motion is sent across 5 miles from Anacostia to Washington, DC. The images were viewed by representatives of the National Bureau of Standards, the U.S. Navy, the Commerce Department, and others. Jenkins called this "the first public demonstration of radiovision".
- June 14 - Turkish football club Göztepe is founded.
- June 29 - Santa Barbara Earthquake of 1925: a 6.3 earthquake destroys downtown Santa Barbara, California.
- Queensland, an Australian state, introduces a 44-hour working week.
- New York City becomes the largest city in the world, taking the lead from London.
- Thompson submachine gun sells for $175 in the 1925 Sears, Roebuck and Company mail order catalog.
- Vladimir Zworykin takes out the first patent for colour television.
- Introduction of London's first Double-decker buses.
- The Royal Tweed Bridge in Berwick-upon-Tweed, England, is completed.
- The National Football League adds five teams: New York Giants, Detroit Panthers, Providence Steam Roller, a new Canton Bulldogs team, and Pottsville Maroons
- The Shueisha Publishing Company is founded.
- Scotch Tape is invented.
- Brisbane City Council, (Brisbane, Australia), is created from the amalgamation of 20 smaller cities, towns and shires.
- January 2 - Larry Harmon, American entertainer and TV producer, Bozo the Clown (d. 2008)
- January 6 - John De Lorean, American car maker (d. 2005)
- January 7 - Gerald Durrell, British naturalist, zookeeper, author, and television presenter (d. 1995)
- January 8 - Helmuth Hubener, Youth political activist against the Hitler regime (d. 1942)
- January 11 - Grant Tinker, American television executive
- January 14 - Yukio Mishima, Japanese writer (d. 1970)
- January 25 - Gilles Deleuze, French philosopher (d. 1995)
- January 26 - Paul Newman, American actor (d. 2008)
- January 30 - Dorothy Malone, American actress
- February 3 - Leon Schlumpf, Swiss Federal Councillor
- February 8 - Jack Lemmon, American actor and film director (d. 2001)
- February 11 - Kim Stanley, American actress (d. 2001)
- February 17
- February 18 - George Kennedy, American actor
- February 20 - Robert Altman, American film director (d. 2006)
- February 21 - Sam Peckinpah, American director (d. 1984)
- February 25 - Shehu Shagari, President of Nigeria
- February 27 - Samuel Dash, American Congressional counsel (d. 2004)
- March 4 - Paul Mauriat, French musician (d. 2006)
- March 12 - Leo Esaki, Japanese physicist, Nobel Prize laureate
- March 16 - Luis E. Miramontes, Mexican chemist (d. 2004)
- March 23 - David Watkin, British cinematographer
- March 25 - Flannery O'Connor, American writer (d. 1964)
- March 26 - Pierre Boulez, French composer
- April 4 - Fariza Magomadova, Chechen teacher
- April 14
- April 20 - Ernie Stautner, German-born American football player (d. 2006)
- April 22 - George Cole, British actor
- April 24 - Eugen Weber, Romanian-born historian
- April 25 - Kay E. Kuter, American actor (d. 2003)
- May 2 - Yogi Berra, baseball player
- May 4 - Maurice R. Greenberg, American businessman
- May 5 - Charles Chaplin Jr., American actor (d. 1968)
- May 19 - Pol Pot, Cambodian Khmer Rouge leader (d. 1998)
- May 19 - Malcolm X, American civil rights activist (d. 1965)
- May 22 - James King, American tenor (d. 2005)
- May 23 - Joshua Lederberg, American molecular biologist, recipient of the Nobel Prize in Physiology or Medicine
- May 25 - Jeanne Crain, American actress (d. 2003)
- May 28 - Pavel Štěpán, Czech pianist (d. 1998)
- June 1 - Dilia Díaz Cisneros, Venezuelan teacher
- June 3 - Tony Curtis, American actor
- June 8 - Barbara Bush, First Lady of the United States
- June 11 - William Styron, American writer (d. 2006)
- June 14 - Pierre Salinger, White House Press Secretary (d. 2004)
- June 21 - Maureen Stapleton, American actress (d. 2006)
- July 1 - Farley Granger, American actor
- July 2 - Medgar Evers , African american civil rights activist
- July 6
- July 10 - Mahathir bin Mohamad, fourth Prime Minister of Malaysia
- July 12 - Roger Bonham Smith, Former chairman and CEO of General Motors (d. 2007)
- July 28 - Baruch S. Blumberg, American scientist, recipient of the Nobel Prize in Physiology or Medicine
- July 29 - Mikis Theodorakis, Greek composer
- July 30 - Alexander Trocchi, Scottish writer (d. 1984)
- August 3 - Dom Um Romão, Brazilian jazz drummer
- August 7 - M. S. Swaminathan, Indian scientist
- August 8 - Alija Izetbegović, President of Bosnia-Herzegovina (d. 2003)
- August 9 - David A. Huffman, American computer scientist (d. 1999)
- August 11 - Mike Douglas, American entertainer (d. 2006)
- August 12
- August 15
- August 16
- August 21 - Maurice Pialat, French actor and director (d. 2003)
- August 22 - Honor Blackman, English actress
- August 25 - Thea Astley, Australian writer (d. 2004)
- August 26 - Jack Hirshleifer, American economist (d. 2005)
- August 27 - Nat Lofthouse, English footballer
- August 28 - Donald O'Connor, American actor, singer, and dancer (d. 2003)
- August 30 - Laurent de Brunhoff, French writer and illustrator
- November 10 - Richard Burton, Welsh actor (d. 1984)
- November 11 - Jonathan Winters, American actor and comedian
- November 18 - Gene Mauch, baseball manager (d. 2005)
- November 20 - Robert Kennedy, American politician and Attorney General of the United States (d. 1968)
- November 24
- November 26 - Eugene Istomin, American pianist (d. 2003)
- November 27 - John Maddox, Welsh science writer
- November 30 - William H. Gates, Sr., American attorney, father of Bill Gates
- December 1 - Martin Rodbell, American scientist, recipient of the Nobel Prize in Physiology or Medicine (d. 1998)
- December 8 - Sammy Davis Jr., American singer, dancer, musician, and actor (d. 1990)
- December 11 - Paul Greengard, American neuroscientist, recipient of the Nobel Prize in Physiology or Medicine
- December 12 - Vladimir Shainsky, Soviet and Russian composer
- December 13 - Dick Van Dyke, American actor, singer, dancer and comedian
- December 14 - Gloria Malgarini, American actress
- December 19 - Robert B. Sherman, American songwriter
- December 29 - Pete Dye, American golf course architect
- date unknown - Godrej Sidhwa, Pakistani theologist.
January - February
- January 4 - Nellie Cashman, Irish-born actress (b. 1845)
- January 8 - George Bellows, American artist (b. 1882)
- January 14 - Camille Decoppet, Swiss Federal Councilor (b. 1852)
- January 31 - George Washington Cable, American writer (b. 1844)
- February 2 - Jaap Eden, Dutch speed skater (b. 1873)
- February 3 - Oliver Heaviside, English mathematician (b. 1850)
- February 4 - Robert Koldewey, German architect and archaeologist (b. 1855)
- February 10 - Aristide Bruant, French singer and nightclub owner (b. 1851)
- February 18 - James Lane Allen, American writer (b. 1849)
- February 24 - Hjalmar Branting, Prime Minister of Sweden, recipient of the Nobel Peace Prize (b. 1860)
- February 25 - Louis Feuillade, French silent film director (b. 1873)
- February 28 - Friedrich Ebert, Chancellor of Germany (b. 1871)
- March 2 - Luigj Gurakuqi, Albanian freedom fighter (assassinated) (b. 1879)
- March 4
- March 7 - Georgy Evgenyevich Lvov, Prime Minister of Russia (b. 1861)
- March 12 - Sun Yat-sen, Chinese revolutionary (b. 1866)
- March 14 - Walter Camp, American football coach (b. 1859)
- March 20 - George Nathaniel Curzon, 1st Marquess Curzon of Kedleston, Viceroy of India (b. 1859)
- March 25 - Tikhon of Moscow, Patriarch of the Russian Orthodox Church (b. 1865)
- March 28 - Henry Rawlinson, 1st Baron Rawlinson, British general (b. 1864)
- April 6 - Alexandra Kitchin, British model for Lewis Carroll (b. 1864)
- April 14 - John Singer Sargent, American artist (b. 1856)
- April 15 - Fritz Haarmann, German serial killer (b. 1879)
- April 19 - John Walter Smith, American politician (b. 1845)
- April 22 - André Caplet, French composer and conductor (b. 1878)
- May 2
- May 10 - William Massey, Prime Minister of New Zealand (b.1856)
- May 12
- May 14 - H. Rider Haggard, English writer (b. 1856)
- May 20 - Elias M. Ammons, Governor of Colorado (b. 1860)
- May 22 - John French, 1st Earl of Ypres, British World War I field marshal (b. 1852)
- May 31 - John Palm, Curacao born composer (b. 1885)
- June 1 - Thomas R. Marshall, Vice President of the United States (b. 1854)
- June 2 - James Ellsworth, American mine owner and banker (b. 1849)
- June 16 - Emmett Hardy, American jazz cornetist (b. 1903)
- June 18 - Robert M. La Follette, Sr., American politician (b. 1855)
- June 22 - Felix Klein, German mathematician (b. 1849)
- June 29 - Christian Michelsen, Prime Minister of Norway (b. 1857)
July - December
- July 1 - Erik Satie, French composer (b. 1866)
- July 7 - Clarence Hudson White American photographer (b.. 1871)
- July 14 - Pancho Villa, Filipino world boxing champion (b. 1901)
- July 26
- August 17 - Ioan Slavici, Romanian writer (b. 1848)
- August 25 - Franz Graf Conrad von Hötzendorf, Austrian field marshal (b. 1852)
- September 7 - René Viviani, Prime Minister of France (b. 1863)
- September 16 - Alexander Alexandrovich Friedman, Russian mathematician (b. 1888)
- September 29 - Léon Bourgeois, French statesman, recipient of the Nobel Peace Prize (b. 1851)
- October 7 - Christy Mathewson, baseball player (b. 1880)
- October 31
- November 20 - Alexandra of Denmark, queen of Edward VII of the United Kingdom (b. 1844)
- November 25 - King Vajiravudh of Siam (b. 1880)
- December 5 - Wladyslaw Reymont, Polish writer, Nobel Prize laureate (b. 1867)
- December 9 - Pablo Iglesias, co-founder of the Spanish Socialist Workers Party (b. 1850)
- December 15 - Battling Siki, Senegalese boxer (b. 1897)
- December 19 - Jose Ignacio Quinton, Puerto Rican composer and pianist (b. 1881)
- December 21 - Jules Méline, Prime Minister of France (b. 1838)
- December 22 - Alice Heine, American wife of Albert I of Monaco (b. 1858)
- December 25 - Karl Abraham, German psychoanalyst (b. 1877)
- December 28 - Sergei Aleksandrovich Yesenin, Russian lyrical poet (b. 1895)
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