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1927 (MCMXXVII) was a common year starting on Saturday 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 8th 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 9 - A fire at the Laurier Palace movie theatre in Montreal, Quebec, Canada, kills 78 children.
- January 10 - Fritz Lang's futuristic film Metropolis is released in Germany.
- January 11 - Louis B. Mayer, head of film studio Metro-Goldwyn-Mayer (MGM), announces the creation of the Academy of Motion Picture Arts and Sciences, at a banquet in Los Angeles, California.
- 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 also July 15).
- 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 recognizes 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 airplane flight, carried out from New York City to Paris, France, in his single-engined aircraft, the Spirit of St. Louis.
- May 22 – The 7.6 Mw Gulang earthquake affects Gansu in northwest China with a maximum Mercalli intensity of XI (Extreme), leaving over 40,000 dead.
- 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.
: Solo flight New York to Paris
- June – The volcanic island of Anak Krakatau begins to form in the Sunda Strait.
- 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 – Spanish airline Iberia is established.
- June 29 – Solar eclipse of June 29, 1927: 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 airplane 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-Treaty Irish 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 also reported in many areas of Palestine and Transjordan such as Amman, Salt, Jordan, and Lydda.
- July 13 (Wednesday, Tamuz 13, 5687): 12:30 – Rebbe Yosef 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.
- 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 some 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.
- 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 3 - Putting Pants on Philip, the first Laurel and Hardy film, is released.
- 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 is 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 despite 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.
- February 1 – Galway Kinnell, American poet (d. 2014)
- February 2
- February 3
- February 4 – Horst Ehmke, German lawyer, law professor and politician (d. 2017)
- February 7
- February 10
- February 11
- February 12 – Rita Meyer, American female professional baseball player (d. 1992)
- February 13 – Buck Hill, American jazz tenor and soprano saxophonist (d. 2017)
- February 14
- February 15
- February 16 – June Brown, British actress
- February 17 – John Selfridge, American mathematician (d. 2010)
- February 20
- February 21
- February 22 – Emil Bobu, Romanian Communist activist and politician (d. 2014)
- February 23
- February 24
- February 25
- February 26 – Tom Kennedy, American game show host
- February 27 – Lynn Cartwright, American actress (d. 2004)
- March 1
- March 2 – Roger Walkowiak, French road bicycle racer (d. 2017)
- March 3 – Pierre Aubert, member of the Swiss Federal Council (d. 2016)
- March 4
- March 5 – Jack Cassidy, American actor of stage, film and screen (d. 1976)
- March 6
- March 7 – James Broderick, American actor (d. 1982)
- March 8
- March 10
- March 11
- March 12 – Raúl Alfonsín, former President of Argentina (d. 2009)
- March 13
- 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 26 – Robert Rosencrans, American public affairs television network (d. 2016)
- March 27
- March 29 – John Vane, British pharmacologist, Nobel Prize laureate (d. 2004)
- March 31
- April 1
- April 2
- April 3
- April 4 – Frederick I. Ordway III, American space scientist (d. 2014)
- April 5
- April 6
- April 8 – Tilly Armstrong (alias Tania Langley and Kate Alexander), British writer (d. 2010)
- April 11 – Abd al-Majid al-Rafei, Lebanese politician (d. 2017)
- 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
- April 18
- April 20
- April 21 – Daniel McKinnon, American ice hockey player (d. 2017)
- April 24 – Josy Barthel, Luxembourgish athlete (d. 1992)
- April 25 – Dickie Dale, English motorcycle road racer (d. 1961)
- April 26
- April 27
- April 29 – Lois Florreich, American female professional baseball player (d. 1991)
- April 30 – Ellen Alaküla, Estonian actress (d. 2011)
- May 1
- May 3 – Jean-Paul Martin-du-Gard, French runner (d. 2017)
- May 4
- May 5 – Pat Carroll, American actress
- May 6 – Ettore Manni, Italian actor (d. 1979)
- May 9
- May 11
- May 13
- May 17 – Marilyn Hall, Canadian-born American television producer (d. 2017)
- May 20 – Bud Grant, Canadian and American football coach
- May 21 – Chuck Stewart, American photographer (d. 2017)
- May 22 – George Andrew Olah, Hungarian-born chemist, Nobel Prize laureate (d. 2017)
- May 23 – Dieter Hildebrandt, German comedian (d. 2013)
- May 25
- May 26 – Endel Tulving, Estonian-Canadian experimental psychologist and cognitive neuroscientist
- May 28
- May 30
- May 31 – Michael Sandberg, Baron Sandberg, British banker and life peer (d. 2017)
- June 3
- June 4 – Geoffrey Palmer (actor), British actor As Time Goes By (UK TV series)
- June 6
- June 7 – Herbert R. Axelrod, American ichthyologist and musical instrument collector (d. 2017)
- June 8 – Jerry Stiller, American comedian and actor
- June 10
- June 12 – Al Fairweather, Scottish jazz musician (d. 1993)
- June 16
- June 17 – Wally Wood, American cartoonist (d. 1981)
- June 18 – Paul Eddington, British actor (d. 1995)
- June 19 – Luciano Benjamín Menéndez, Argentine general
- June 20 – Bernard Cahier, French F1 photo journalist (d. 2008)
- June 21
- June 22 – Karl Schügerl, Hungarian chemical engineering studies
- June 23
- June 24
- June 25
- June 26
- Jerry Schatzberg, photographer and film director
- Ben Turok, former anti-apartheid activist, Economics Professor and former South African member of parliament and a member of the African National Congress
- June 27
- June 28
- June 29
- Viola Myers, Canadian sprinter
- Pierre Savard, Canadian politician
- Roy Radner, American economist
- Marie Thérèse Killens, Canadian politician
- Bert Hubbard, American synchronized swimmer, choreographer and coach
- Pat McGeer, Canadian physician, professor, baskebtall player and medical researcher
- Kenneth Snelson, American contemporary sculptor and photographer (d. 2016)
- June 30
- July 1
- July 2
- July 3
- July 4
- July 5
- July 6
- July 7
- July 8
- July 9
- July 10
- July 11
- July 12
- July 13
- July 14
- July 15
- Ann Jellicoe, British playwright, theatre director and actress
- Carmen Zapata, American actress (d. 2014)
- Håkon Brusveen, Norwegian cross-country skier
- Leo C. Zeferetti, American politician
- Joe Turkel, American actor
- Nan Martin, American actress (d. 2010)
- Caerwyn Roderick, British Labour Party politician (d. 2011)
- Gloria Pall, American model, showgirl, actress, author and businesswoman (d. 2012)
- Ted Slevin, English professional rugby league footballer
- July 16
- July 17
- July 18
- July 19
- July 20
- July 21
- July 22
- July 26 – Danny La Rue, Irish drag queen (d. 2009)
- July 27 – John Seigenthaler, American journalist, writer, and political figure (d. 2014)
- July 28 – John Ashbery, American poet (d. 2017)
- July 30
- August 4
- August 5 – Rolf Wütherich, German automotive engineer and racer (d. 1981)
- August 6
- 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 10 – Eivind Eckbo, Norwegian politician, lawyer and farmer (d. 2017)
- August 11
- August 12 – Porter Wagoner, American country singer (d. 2007)
- August 13 – David Padilla, 64th President of Bolivia (d. 2016)
- August 14
- August 15 – Carmela Marie Cristiano, American Roman Catholic nun (d. 2011)
- August 17
- August 18 – Rosalynn Carter, First Lady of the United States
- August 19 – L. Q. Jones, American actor
- August 20 – Peter Oakley, also known as geriatric1927, British vlogger (d. 2014)
- August 21 – Thomas S. Monson, American religious leader (d. 2018)
- August 23
- August 25 – Althea Gibson, African-American tennis player (d. 2003)
- August 26
- August 27 – Fouad al-Tikerly, prominent Iraqi novelist and writer (d. 2008)
- August 29 – A. Ross Eckler Jr., American logologist, statistician and author (d. 2016)
- August 30
- September 3 – Br. John Hamman S.M. (d. 2000), close-up magician, inventor, Marianist brother (d. 2000)
- September 4 – Antônio Carlos Magalhães, Brazilian politician (d. 2007)
- September 5 – Paul Volcker, American economist and academic
- September 7 – Eric Hill, English author and illustrator (d. 2014)
- September 10
- September 11
- September 13 – Laura Cardoso, Brazilian actress
- September 15 – John M. Jacobus Jr., American art historian (d. 2017)
- September 16
- September 19
- September 21
- September 22
- September 23
- September 24 – Arthur Malet, English actor (d. 2013)
- September 25
- September 27 – Steve Stavro, Canadian businessman and sports team owner (d. 2006)
- September 28 – Alícia Raquel de Videla, former first Lady of Argentina
- September 29
- 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
- Turgut Özal, 8th President and 26th Prime Minister of Turkey (d. 1993)
- October 14 – Roger Moore, English actor (d. 2017)
- October 15 – Peter Pollen, Canadian politician (d. 2017)
- 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 25
- October 27 – Silvia Laidla, Estonian actress (d. 2012)
- October 28 – Roza Makagonova, Russian actress (d. 1995)
- December 2 – Prabhakar Thokal, Indian cartoonist (d. 1999)
- December 3
- December 4 – Rafael Sánchez Ferlosio, Spanish writer
- December 5
- December 6 – Marcel Pelletier, Canadian ice hockey player (d. 2017)
- December 7 – Helen Watts, Welsh contralto (d. 2009)
- December 8 – Vladimir Shatalov, Russian cosmonaut
- December 9 – Pierre Henry, French composer (d. 2017)
- December 10 – Bob Farrell, American motivational speaker, author, and founder of Farrell's Ice Cream Parlour and Restaurant (d. 2015)
- December 11 – Stein Eriksen, Norwegian Olympic skiier (d. 2015)
- December 12 – Robert Noyce, Intel cofounder (d. 1990)
- December 13 – James Wright, American poet (d. 1980)
- December 16 – Akihiko Hirata, Japanese actor (d. 1984)
- December 17 – Richard Long, American actor (d. 1974)
- December 18
- December 20
- December 23 – Alexander Vedernikov, Russian singer and teacher (d. 2018)
- December 24 – Mary Higgins Clark, American novelist
- December 25
- December 26
- December 27
- December 28 – Edward Babiuch, Polish Communist political figure
- December 29
- December 30
- December 31 – NOF4, Italian painter and graffiti artist (d. 1994)
- Charles J. Shindo. 1927 and the Rise of Modern America (University Press of Kansas; 244 pages; 2010).