1927 (MCMXXVII) was a common yearstarting on Saturday (dominical letter B) of the Gregorian calendar, the 1927th year of the Common Era (CE) and Anno Domini (AD) designations, the 927th year of the 2nd millennium, the 27th year of the 20th century, and the eighth year of the 1920s decade.
- January 1 – The Cristero War erupts in Mexico when Catholic rebels attack the government, which had placed heavy restrictions on the Catholic Church.
- January 7 – The first transatlantic telephone call is made via radio from New York City to London.
- January 7 – The Harlem Globetrotters play their first ever road game in Hinckley, Illinois.
- January 9 – A military rebellion is crushed in Lisbon, Portugal.
- January 15 – Teddy Wakelam gives the first sports commentary on BBC Radio.
- January 19 – Great Britain sends troops to China to protect foreign nationals from spreading anti-foreign riots in Central China.
- January 24 – U.S. marines invade Nicaragua by orders of President Calvin Coolidge, intervening in the Nicaraguan Civil War and remaining in the country until 1933.
- January 30 – Right-wing veterans and the Republikanischer Schutzbund clash in Schattendorf, Austria, with two fatalities resulting (see additionally July 15).
- February – Werner Heisenberg formulates his famous uncertainty principle while employed as a lecturer at Niels Bohr's Institute for Theoretical Physics at the University of Copenhagen.
- February 12 – The first British troops land in Shanghai.
- February 14 – An earthquake in Yugoslavia kills 100.
- February 19
- February 23 – The U.S. Federal Radio Commission (later renamed the Federal Communications Commission) begins to regulate the use of radio frequencies.
- March 4 – A diamond rush in South Africa includes trained athletes that have been hired by major companies to stake claims.
- March 7 – The 7.0 MwKita Tango earthquake kills at least 2,925 in the Toyooka and Mineyama areas, western Honshu, Japan.
- March 10 – Albania mobilises in case of an attack by Yugoslavia.
- March 11
- March 13 – Fritz Lang's culturally influential film Metropolis premieres in Germany.
- March 24 – Nanking Incident: After six foreigners have been killed in Nanking and it appears that Kuomintang and Communist Party of China forces would overrun the foreign consulates, warships of the U.S. Navy and the British Royal Navy fire shells and shot to disperse the crowds.
- April 1 – The U.S. Bureau of Prohibition is founded (under the Department of the Treasury).
- April 5 – In Britain, the Trade Disputes and Trade Unions Act 1927 forbids strikes of support.
- April 7 – Bell Telephone Co. transmits an image of Herbert Hoover (then the Secretary of Commerce), which becomes the first successful long distance demonstration of television.
- April 12
- The Royal and Parliamentary Titles Act 1927 renames the United Kingdom of Great Britain and Ireland as the United Kingdom of Great Britain and Northern Ireland. The change acknowledges that the Irish Free State is no longer part of the Kingdom.
- Kuomintang troops kill a number of communist-supporting workers in Shanghai. The incident is called the April 12 Incident, or the Shanghai Massacre. The first United Front between the Nationalists and Communist ends, and the Civil War lasting until 1949 begins.
- April 14 – The first Volvo automobile rolled off the production line in Gothenburg, Sweden.
- April 18 – The Kuomintang (Nationalist Chinese) set up a government in Nanking, China.
- April 21 – A banking crisis hits Japan.
- April 22–May 5 – The Great Mississippi Flood of 1927 strikes 700,000 people in the greatest natural disaster in American history through that time.
- April 27
- May – Philo Farnsworth of the United States transmits his first experimental electronic TV motion pictures, as opposed to the electromechanical TV systems that others had used before.
- May 9 – The Australian Parliament convenes for the first time in Canberra, Australian Capital Territory. Previously, the Parliament had met in Melbourne, State of Victoria.
- May 11 – The Academy of Motion Picture Arts and Sciences, the "Academy" in "Academy Awards", is founded.
- May 12 – British police officers raid the office of the Soviet trade delegation in London.
- May 13 – King George V proclaims the change of his title from King of the United Kingdom of Great Britain and Ireland to King of Great Britain and Northern Ireland.
- May 17 – U.S. Army aviation pioneer Major Harold Geiger dies in the crash of his Airco DH.4 airplane, at Olmsted Field, Pennsylvania.
- May 18 – Bath School disaster: a series of violent attacks results in 45 deaths, mostly of school children, in Bath Township, Michigan.
- May 20 – By the Treaty of Jeddah, the United Kingdom recognises the sovereignty of Ibn Saud over the Kingdom of Hejaz and Nejd, the future Saudi Arabia.
- May 20–21 – Charles Lindbergh makes the first solo, nonstop transatlantic aeroplane flight, carried out from New York City to Paris, France, in his single-engined aircraft, the Spirit of St. Louis.
- May 22 – A magnitude 8.6 earthquake in Xining, China kills about 200,000 people.
- May 23 – Nearly 600 members of the American Institute of Electrical Engineers and the Institute of Radio Engineers view a live demonstration of television at the Bell Telephone Building in New York City, just over a year after John Logie Baird of Scotland had first demonstrated an electromechanical television system to the members of the Royal Society in London.
- May 24 – The United Kingdom cuts its diplomatic relations with the Soviet Union due to revelations of espionage and underground agitation.
- June 4 – Yugoslavia severs diplomatic relations with Albania.
- June 4–6 – Clarence Chamberlin and Charles Albert Levine take off from Roosevelt Field, New York, and fly to Eisleben, Germany, in the Wright-Bellanca WB-2 Columbia aircraft Miss Columbia, two weeks after Charles Lindbergh's historic solo flight.
- June 7 – Pyotr Voykov, the Soviet ambassador to Poland, is murdered.
- June 9 – The Soviet Union executes 20 for alleged espionage.
- June 13
- June 28 – Iberia Spanish Airlines is established.
- June 29 – A total eclipse of the sun takes place over Wales, northern England, southern Scotland, Norway, northern Sweden, northmost Finland, and the northmost extremes of Russia.
- June 29-July 1 – Commander Richard E. Byrd, Bernt Balchen, George Noville, and Bert Acosta take off from Roosevelt Field, New York, in the Fokker Trimotor aeroplane America and cross the Atlantic to the coast of France, having to ditch there because of bad weather. All four men survive the emergency landing.
- July 1 – The Food, Drug, and Insecticide Administration (FDIA) is established as a United States federal agency.
- July 10 – Kevin O'Higgins, Vice-President of the Executive Council of the Irish Free State and Minister for Justice, is assassinated by the anti-TreatyIrish Republican Army in Dublin.
- July 11 – The 1927 Jericho earthquake strikes Palestine, killing around 300 people. The effects are especially severe in Nablus, but damage and fatalities are additionally reported in a large number of areas of Palestine and Transjordan such as Amman, Salt, Jordan, and Lydda.
- July 13 (Wednesday, Tamuz 13, 5687): 12:30 – RebbeYosef Yitzchak Schneersohn is freed from the imprisonment which began on June 15 (Wednesday, Sivan 15, 5687) at 02:15 in exile in the Russian town of Kostroma.
- July 15 – July Revolt of 1927: 85 protesters and five policemen are left dead after the police in Vienna fire on an angry crowd, mostly members of the Social Democratic Party of Austria; more than 600 people are injured.
- July 24 – The Menin Gate is dedicated as a war memorial at Ypres, Belgium.
- August 1 – The Communist Chinese People's Liberation Army is formed throughout the Nanchang Uprising.
- August 2 – U.S. President Calvin Coolidge announces, "I don't choose to run for president in 1928."
- August 7 – The Peace Bridge opens between Fort Erie, Ontario and Buffalo, New York.
- August 10 – The Mount Rushmore Park is rededicated. President Calvin Coolidge promises national funding for the proposed carving of the presidential figures.
- August 22 – 200 people demonstrate in Hyde Park, London against the death sentencing of Italian immigrant anarchists Sacco and Vanzetti.
- August 23 – Sacco and Vanzetti are executed.
- August 24 – August 25 – Hurricane hits the Atlantic Provinces of Canada, causing massive damage and at least 56 deaths.
- August 26 – Paul R. Redfern leaves Brunswick, Georgia, flying his Stinson Detroiter "Port of Brunswick" to attempt a solo nonstop flight to Rio de Janeiro, Brazil. He later crashes in the Venezuelan jungle, but the crash site has never been found.
- September – The Autumn Harvest Uprising occurs in China.
- September 7 – The University of Minas Gerais is founded in Brazil.
- September 18 – The Columbia Phonographic Broadcasting System (later known as CBS) is formed and goes on the air with 47 radio stations.
- September 25 – A treaty signed by the League of Nations Slavery Commission abolishes all types of slavery.
- September 27 – 79 are killed and 550 are injured in the East St. Louis Tornado, the second costliest and at least twenty-fourth deadliest tornado in U.S. history.
- October – The Fifth Solvay Conference, held in the latter half of the month, establishes the acceptance of the Copenhagen interpretation.
- October 4 – The actual carving begins at Mount Rushmore, South Dakota.
- October 6 – The Jazz Singer opens in the United States and it becomes a huge success, although silent films continue to be made for a few time.
- October 8 – Murderers' Row: The New York Yankees complete a four-game sweep of the Pittsburgh Pirates in the World Series.
- October 9 – The Mexican government crushes a rebellion in Veracruz.
- October 18 – The first flight of Pan American Airways takes off from Key West, Florida, bound for Havana, Cuba.
- October 25 – The Italian steamer ship Principessa Mafalda capsizes off Porto Seguro, Brazil. At least 314 people are killed.
- October 27
- Queen Wilhelmina of the Netherlands opens the Meuse-Waal Canal in Nijmegen, Holland
- At 5:50 a.m. a ground fault gives way, causing the mine and part of the town of Worthington to collapse into a large chasm located in Ontario. Nobody is injured in the incident, as the area had been evacuated the night before after a mine foreman noticed abnormal rock shifts in the mine.
- November 1 – İsmet İnönü forms a new government in Turkey (The fifth government).
- November 3 – November 4 – Floods devastating Vermont cause the "worst natural disaster in the state's history".
- November 4 – Frank Heath and his horse Gypsy Queen return to Washington, D.C., having completed a two-year journey of 11,356 miles to all 48 of the states (of that time).
- November 12
- Mahatma Gandhi makes his first and last visit to Ceylon.
- Leon Trotsky is expelled from the Soviet Communist Party, leaving Joseph Stalin with undisputed control of the Soviet Union.
- The Holland Tunnel opens to traffic as the first vehicular tunnel under the Hudson River linking New Jersey with New York City.
- November 14 – The Pittsburgh gasometer explosion: Three Equitable Gas storage tanks in the North Side of Pittsburgh explode, killing 26 people and causing damage estimated between $4.0 million and $5.0 million.
- November 21 – The Colorado state police open fire on 500 rowdy but unarmed miners throughout a strike, killing six of them.
- December – The Communist Party Congress condemns all deviation from the general party line in the USSR.
- December 2 – Following 19 years of Ford Model T production, the Ford Motor Company unveils the Ford Model A as its new automobile.
- December 14 – Iraq gains independence from the United Kingdom.
- December 15 – Marion Parker, 12, is kidnapped in Los Angeles. Her dismembered body is found on December 19, prompting the largest manhunt to date on the West Coast for her killer, William Edward Hickman, who's arrested on December 22 in Oregon.
- December 17 – The United States Navy submarine S-4 is accidentally rammed and sunk by the United States Coast Guard cutter John Paulding off Provincetown, Massachusetts, killing everyone aboard notwithstanding several unsuccessful attempts to raise the submarine.
- December 19 –3 Indian Revolutionaries, viz Pandit Ram Prasad Bismil, Thakur Roshan Singh, and Ashfaqulla Khan, are executed by the British Raj. Rajendra Nath Lahiri had been executed two days before.
- December 27 – Kern and Hammerstein's musical play, Show Boat, based on Edna Ferber's novel, opens on Broadway and then goes on to become the first great classic of the American musical theater.
- December 30 – The first Japanese commuter metro line, the Tokyo Metro Ginza Line, opens.
- The British Broadcasting Corporation is granted a Royal Charter of Incorporation.
- Harold Stephen Black invents the feedback amplifier.
- The Voluntary Committee of Lawyers is founded to bring about the Repeal of Prohibition in the United States.
- World population reaches two billion.
- In Britain, 1,000 people a week die from an influenza epidemic.
- January 1
- January 4 – Barbara Rush, American actress
- January 5 – Satguru Sivaya Subramuniyaswami, American-born Hindu guru (d. 2001)
- January 10
- January 13
- January 17
- January 23 – Jack Quinlan, Chicago Cubs Radio Broadcaster (d. 1965)
- January 24 – Lasse Pöysti, Finnish writer and playwright
- January 25
- January 26 – José Azcona del Hoyo, President of Honduras (d. 2005)
- January 28
- January 29
- January 30
- February 1 – Galway Kinnell, American poet (d. 2014)
- February 2
- February 3
- February 7
- February 10 – Leontyne Price, African-American soprano
- February 11 – Nalda Bird, American female professional baseball player (d. 2004)
- February 12 – Rita Meyer, American female professional baseball player (d. 1992)
- February 14
- February 15 – Harvey Korman, American actor and comedian (d. 2008)
- February 16 – June Brown, British actress
- February 17 – John Selfridge, American mathematician (d. 2010)
- February 20
- February 21
- February 23
- February 24
- February 25 – Ralph Stanley, American bluegrass banjo player and vocalist (d. 2016)
- February 26 – Tom Kennedy, American game show host
- February 27 – Lynn Cartwright, American actress (d. 2004)
- March 1
- March 3 – Pierre Aubert, member of the Swiss Federal Council (d. 2016)
- March 4
- March 6
- March 8 – Dick Hyman, American composer and pianist
- March 10
- March 11
- March 12 – Raúl Ricardo Alfonsín, former President of Argentina (d. 2009)
- March 13 – Robert Denning, American interior designer (d. 2005)
- March 15
- March 16
- March 17 – Roberto Suazo Córdova, President of Honduras
- March 18 – George Plimpton, American writer and actor (d. 2003)
- March 20
- March 21 – Hans-Dietrich Genscher, German politician (d. 2016)
- March 23 – Mato Damjanović, Croatian chess grandmaster (d. 2011)
- March 24 – Martin Walser, German author
- March 25
- March 27
- March 29 – John Robert Vane, British pharmacologist, Nobel Prize laureate (d. 2004)
- March 31
- April 1 – Peter Cundall, Australian horticulturist and television presenter
- April 2
- April 3 – Éva Székely, Hungarian swimmer
- April 5 – Chao-Li Chi, Shanxi-born actor (d. 2010)
- April 6 – Gerry Mulligan, American musician (d. 1996)
- April 8 – Tilly Armstrong (alias Tania Langley and Kate Alexander), British writer (d. 2010)
- April 10 – Marshall Warren Nirenberg, American scientist, Nobel Prize laureate (d. 2010)
- April 14 – Alan MacDiarmid, New Zealand chemist, Nobel Prize laureate (d. 2007)
- April 15 – Robert Mills, American physicist (d. 1999)
- April 16
- April 17 – Margot Honecker, East German politician (d. 2016)
- April 18
- April 20
- April 26
- April 27 – Coretta Scott King, African-American civil rights leader, wife of Dr. Martin Luther King Jr. (d. 2006)
- April 29 – Lois Florreich, American female professional baseball player (d. 1991)
- May 5 – Pat Carroll (actress), American actress
- May 9 – Manfred Eigen, German biophysicist, recipient of the Nobel Prize in Chemistry
- May 9 – Wim Thoelke, German television entertainer (d. 1995)
- May 11
- May 13 – Herbert Ross, American film director (d. 2001)
- May 20 – Bud Grant, Canadian and American football coach
- May 22 – George Andrew Olah, Hungarian-born chemist, Nobel Prize laureate
- May 23 – Dieter Hildebrandt, German comedian (d. 2013)
- May 25 – Robert Ludlum, American author (d. 2001)
- May 26 – Endel Tulving, Estonian-Canadian experimental psychologist and cognitive neuroscientist
- May 28 – Ralph Carmichael, American composer and arranger
- May 30
- June 3 – Boots Randolph, American saxophone player (d. 2007)
- June 4 – Geoffrey Palmer (actor), British actor As Time Goes By (TV series)
- June 8 – Jerry Stiller, American comedian and actor
- June 10 – Ladislao Kubala, Hungarian football player and manager (d. 2002)
- June 12 – Al Fairweather, Scottish jazz musician (d. 1993)
- June 18 – Paul Eddington, British actor (d. 1995)
- June 20 – Bernard Cahier, French F1 photo journalist (d. 2008)
- June 21 – Carl Stokes, American politician (d. 1996)
- June 23 – Bob Fosse, American choreographer and director (d. 1987)
- June 24 – Martin Lewis Perl, American physicist, Nobel Prize laureate (d. 2014)
- June 25 – Chuck Smith, American pastor (d. 2013)
- June 27
- June 28 – Frank Sherwood Rowland, American chemist, Nobel Prize laureate (d. 2012)
- July 1 – Winfield Dunn, Politician; Governor of Tennessee (1971–1975)
- July 4
- July 6
- July 7
- July 9 – David Diop, French West African poet (d. 1960)
- July 10
- July 15 – Joe Turkel, American actor
- July 17 – Roy Stuart, American actor (d. 2005)
- July 18 – Kurt Masur, German conductor (d. 2015)
- July 26 – Danny La Rue, Irish drag queen (d. 2009)
- July 28 -- John Ashbery, Poet
- July 30
- August 4 – Jess Thomas, American tenor (d. 1993)
- August 7
- August 8 – Johnny Temple, American baseball player (d. 1994)
- August 9 – Marvin Minsky, American computer scientist, Turing Award winner (Artificial intelligence) (d. 2016)
- August 11 – Stuart Rosenberg, American director (d. 2007)
- August 12 – Porter Wagoner, American country singer (d. 2007)
- August 14 – Roger Carel (Bancharel), French actor
- August 18 – Rosalynn Carter, First Lady of the United States
- August 19 – L. Q. Jones, American actor
- August 20 – Peter Oakley, additionally known as geriatric1927, British vlogger (d. 2014)
- August 25 – Althea Gibson, African-American tennis player (d. 2003)
- August 26 – Ma Jir Bo, Chinese Realism oil painter (d. 1985)
- August 27 – Fouad al-Tikerly, prominent Iraqi novelist and writer (d. 2008)
- August 30
- September 3 – Br. John Hamman S.M. (d. 2000), close-up magician, inventor, Marianist brother (d. 2000)
- September 7 – Eric Hill, English author and illustrator (d. 2014)
- September 10 – Johnny Keating, Scottish musician and songwriter (d. 2015)
- September 11
- September 16
- September 19
- September 21
- September 22
- September 24 – Arthur Malet, English actor (d. 2013)
- September 25 – Sir Colin Davis, English conductor (d. 2013)
- September 27 – Steve Stavro, Canadian businessman and sports team owner (d. 2006)
- September 29 – Adhemar Ferreira da Silva, Brazilian athlete (d. 2001)
- September 30 – W. S. Merwin, American poet
- October 1 – Tom Bosley, American actor (d. 2010)
- October 6 – Antony Grey, English gay rights activist (d. 2010)
- October 8 – César Milstein, Argentine scientist; received the Nobel Prize in Physiology or Medicine (d. 2002)
- October 10 – Dana Elcar, American actor and director (d. 2005)
- October 11 – Princess Joséphine Charlotte of Belgium, Grand Duchess of Luxembourg (d. 2005)
- October 13 – Lee Konitz, American jazz composer and alto saxophonist
- October 14 – Roger Moore, English actor
- October 16 – Günter Grass, German writer, Nobel Prize laureate (d. 2015)
- October 18 – George C. Scott, American actor (d. 1999)
- October 19 – Pierre Alechinsky, Belgian painter
- October 23 – Leszek Kołakowski, Polish philosopher (d. 2009)
- October 24 – Cal Hogue, American baseball player (d 2005)
- October 28 – Roza Makagonova, Russian actress (d. 1995)
- November 2 – Steve Ditko, American comic-book writer and artist
- November 3
- November 4 – Bobby Breen, Canadian-born American actor and singer (d. 2016)
- November 5 – Kenneth Waller, English actor (d. 2000)
- November 7 – Hiroshi Yamauchi, Japanese businessman and president of Nintendo (d. 2013)
- November 8 – Patti Page, American singer (d. 2013)
- November 10 – Sabah, Lebanese singer and actress (d. 2014)
- November 14 – McLean Stevenson, American actor (d. 1996)
- November 15 – Gregor Mackenzie, British politician (d. 1992)
- November 17
- November 18 – Hank Ballard, American musician (d. 2003)
- November 21 – Georgia Frontiere, co-owner of the Los Angeles/St. Louis Rams (d. 2008)
- November 23 – Guy Davenport, American author, artist, and scholar (d. 2005)
- November 24
- November 28
- November 29 – Vin Scully, American baseball broadcaster
- November 30 – Robert Guillaume, American actor
- December 2 – Prabhakar Thokal, Indian cartoonist (d. 1999)
- December 3 – Andy Williams, American singer (d. 2012)
- December 5
- December 7 – Helen Watts, Welsh contralto (d. 2009)
- December 8 – Vladimir Shatalov, Russian cosmonaut
- December 9 – Pierre Henry, French composer
- December 12 – Robert Noyce, Intel cofounder (d. 1990)
- December 13 – James Wright, American poet (d. 1980)
- December 17 – Richard Long, American actor (d. 1974)
- December 18 – Roméo LeBlanc, 25th Governor General of Canada (d. 2009)
- December 20
- December 24 – Mary Higgins Clark, American novelist
- December 25
- December 26
- December 27 – Genevieve Audrey Wagner, American professional baseball player and Doctor of Medicine (d. 1984)
- December 29 – Andy Stanfield, American athlete (d. 1985)
- December 30 – Jan Kubíček, Czech constructivist painter and sculptor (d. 2013)
- January 9 – Houston Stewart Chamberlain, English-German author (b. 1855)
- January 19 – Empress Carlota of Mexico (b. 1840)
- January 21 – Charles Warren, British police officer and archaeologist (b. 1840)
- February 4 – Janko Vukotić, Montenegrin general (b. 1866)
- February 13 – Brooks Adams, American historian (b. 1848)
- February 16 – Carl Theodore Vogelgesang, American admiral (b. 1869)
- February 19
- February 26
- March 4
- March 11 – Xenophon Stratigos, Greek general (b. 1869)
- March 14 – Jānis Čakste, Latvian politician, first president of Latvian Republic (b. 1859)
- March 17 – Charles Emmett Mack, American actor (b. 1900)
- March 22 – Templin Potts, American naval officer; eleventh Naval Governor of Guam (b. 1855)
- March 23 – Paul César Helleu, French artist (b. 1859)
- March 25 – Marie-Alphonsine Danil Ghattas, Palestinian Catholic nun, canonised (b. 1843)
- March 27 – Joe Start, American baseball player (b. 1842)
- April 15 – Gaston Leroux, French journalist and author (b. 1868)
- April 20 – Enrique Simonet, Spanish painter (b. 1866)
- April 25 – Earle Williams, American actor (b. 1880)
- May 2 – Ernest Starling, English physiologist (b. 1866)
- May 3 – Ernest Ball, American singer and songwriter (b. 1878)
- May 8 – Charles Nungesser, French aviator and World War I fighter ace (date of disappearance) (b. 1892)
- May 11 – Juan Gris, Spanish sculptor and painter (b. 1887)
- May 25 – Henri Hubert, French archaeologist and sociologist (b. 1872)
- June 1
- June 4 – Robert McKim, American actor (b. 1886)
- June 9 – Victoria Woodhull, American feminist and spiritualist (b. 1838)
- June 11 – William Attewell, English cricketer (b. 1861)
- June 14 – Jerome K. Jerome, English writer (b. 1859)
- July 5
- July 8 – Max Hoffmann, German general (b. 1869)
- July 9 – John Drew, Jr., American stage actor (b. 1853)
- July 20 – King Ferdinand of Romania (b. 1865)
- July 24 – Ryūnosuke Akutagawa, Japanese poet and writer (b. 1892)
- July 26 – June Mathis, American screenwriter (b. 1889)
- August 13 – James Oliver Curwood, American novelist and conservationist (b. 1878)
- August 17 – Johannes Theodor Baargeld, German painter and poet (b. 1892)
- August 23
- August 24 – Manuel Díaz Rodríguez, Venezuelan writer (b. 1871)
- September 1 – Amelia Bingham, American stage actress (b. 1869)
- September 5
- September 14
- September 19 – Michael Ancher, Danish painter (b. 1849)
- September 29 – Willem Einthoven, Dutch inventor, recipient of the Nobel Prize in Physiology or Medicine (b. 1860)
- September 30 – Charles Kilpatrick (cyclist), American one-legged trick cyclist (b. 1869)
- October 2 – Svante Arrhenius, Swedish chemist, Nobel Prize laureate (b. 1859)
- October 5 – Sam Warner, Hollywood studio executive (b. 1887)
- October 10 – Gustave Whitehead, German-born aviation pioneer (b. 1874)
- October 16 – David Macpherson, Canadian-born American civil engineer (b. 1854)
- October 22
- October 27 – Joseph "Squizzy" Taylor, Australian underworld figure (b. 1888)
- November 1 – Florence Mills, American cabaret singer (b. 1896)
- November 4
- November 11 – Wilhelm Johannsen, Danish botanist, physiologist and geneticist (b. 1857)
- November 18 – Emma Carus, American opera contralto, (b. 1879)
- November 23 – Alfred III, Prince of Windisch-Grätz, former Prime Minister of Austria (b. 1851)
- December 17
- December 18 – Pandit Ram Prasad Bismil, Indian Revolutionary, Hindustan Republican Association (b. 1897
- December 19