|Ab urbe condita||2674|
|British Regnal year||11 Geo. 5 – 12 Geo. 5|
|Chinese calendar||庚申年 (Metal Monkey)
4617 or 4557
— to —
辛酉年 (Metal Rooster)
4618 or 4558
|- Vikram Samvat||1977–1978|
|- Shaka Samvat||1842–1843|
|- Kali Yuga||5021–5022|
|Japanese calendar||Taishō 10
|Julian calendar||Gregorian minus 13 days|
|Minguo calendar||ROC 10
|Thai solar calendar||2463–2464|
|Wikimedia Commons has media related to 1921.|
1921 (MCMXXI) was a common year starting on Saturday (dominical letter B) of the Gregorian calendar and a common year starting on Friday (dominical letter C) of the Julian calendar, the 1921st year of the Common Era (CE) and Anno Domini (AD) designations, the 921st year of the 2nd millennium, the 21st year of the 20th century, and the 2nd year of the 1920s decade. As of the start of 1921, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.
- 1 Events
- 2 Births
- 3 Deaths
- 4 Nobel Prizes
- 5 References
- 6 Sources
- January 1 – In American football, the University of California, Berkeley defeats Ohio State 28–0 in the Rose Bowl.
- January 2
- The football club Cruzeiro Esporte Clube from Belo Horizonte is founded as Palestra Italia in Brazil.
- The first religious radio broadcast is heard over station KDKA AM in Pittsburgh.
- The Spanish liner Santa Isabel sinks off Villa Garcia; 244 die.
- The De Young Museum opens in Golden Gate Park, San Francisco.
- January 20 – The British K-class submarine HMS K5 sinks in the English Channel; all 56 on board die.
- January 21
- The Italian Communist Party is founded in Livorno.
- The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa.
- Women's suffrage is attained in Sweden.
- The full-length silent comedy-drama film The Kid, written, produced, directed by and starring Charlie Chaplin (in his Tramp character), with Jackie Coogan, is released in the United States.
- January 25 – The Italian battleship Leonardo da Vinci is righted in Taranto Harbour.
- February 12 – Red Army invasion of Georgia: The Democratic Republic of Georgia is invaded by forces of Bolshevist Russia.
- February 20 – The Young Communist League of Czechoslovakia is founded.
- February 21 – 1921 Persian coup d'état: Rezā Khan and Zia'eddin Tabatabaee stage a coup d'état in Iran.
- February 23 – The moderately conservative public official Oscar von Sydow takes over the Swedish premiership from Baron Louis De Geer the younger.
- February 25 – Red Army invasion of Georgia: The Red Army enters the Georgian capital Tbilisi and installs a Moscow-directed communist government.
- February 27 – The International Working Union of Socialist Parties is formed in Vienna.
- February 28 – The Kronstadt rebellion is initiated by sailors of the Soviet Navy's Baltic Fleet.
- March – Group Settlement Scheme in Western Australia begins.
- March 1 – The city of Kiryū, located in Gunma Prefecture, Japan, is founded.
- March 4 – Warren G. Harding is sworn in as President of the United States.
- March 5 – Irish War of Independence: Clonbanin Ambush: Irish Republican Army kills Brigadier General Cumming.
- March 6 – The Portuguese Communist Party is founded.
- March 8
- March 12 – The İstiklâl Marşı (Independence March), the Turkish national anthem, is officially adopted.
- March 13 – Occupation of Mongolia: The Russian White Army captures Mongolia from China. Roman von Ungern-Sternberg declares himself ruler.
- March 14 – Armenian Soghomon Tehlirian assassinates Mehmed Talaat, former Interior Minister of Turkey, in Charlottenburg, Berlin.
- March 16 – Six Irish Republican Army men of the Forgotten Ten are hanged in Mountjoy Prison, Dublin.
- March 17
- March 18 – The second Peace of Riga ends the Polish–Soviet War. A permanent border is established between the Polish and Soviet states.
- March 20 – Upper Silesia plebiscite votes for re-annexation to Germany.
- March 21
- March 24 – The 1921 Women's Olympiad begins in Monte Carlo, first international women's sports event
- March 31 – Abkhazia becomes a republic Abkhazian SSR.
- April – The United States Figure Skating Association is formed.
- April 11 – The Emirate of Transjordan is created, with Abdullah I as emir.
- April 14 – In Britain, labour unions for mining, railway and transportation workers call for a strike; the government threatens to call in the army.
- April 20 – Ferenc Molnár's play Liliom is first produced on Broadway in English.
- April 27 – The Allies of World War I reparations commission announce that Germany has to pay 132 billion gold marks ($33 trillion) in annual installments of 2.5 billion.
- May 1–May 7 – Jaffa riots: Riots at Jaffa in Mandatory Palestine result in 47 Jewish and 48 Arab deaths.
- May 2–July 5 – Third Silesian Uprising: Poles in Upper Silesia rise against the Germans.
- May 3 – The province of Northern Ireland is created within the United Kingdom.
- May 5 – Only thirteen spectators attend the football match between Leicester City and Stockport County, the lowest attendance in The Football League's history.
- May 6 – German-Russian Provisional Agreement signed, Germany recognised Soviet regime in Russia.
- May 14–May 15 – Major geomagnetic storm.
- May 14–May 17 – Violent anti-European riots occur in Cairo and Alexandria.
- May 16 – The Communist Party of Czechoslovakia is founded.
- May 19 – The Emergency Quota Act is passed by the United States Congress, establishing national quotas on immigration.
- May 23 – In Leipzig the Leipzig War Crimes Trials start. They will end on July 16.
- May 24 – First Northern Ireland general election for the new Parliament of Northern Ireland is held.
- May 26 – A general strike begins in Norway.
- May 31 – Tulsa race riot begins in Tulsa, Oklahoma. The official death toll is 39, but later investigations suggest the actual toll may be much higher.
- June 21 – International Hydrographic Bureau (IHB) established as an agency of the League of Nations; continues in this form until April 19, 1946.
- June 27 – The first signings of Treaty 11, an agreement between George V, King of Canada, and various Canadian First Nations, are conducted at Fort Providence.
- June 28 – The Constitutional Assembly of the Kingdom of Serbs, Croats and Slovenes passes the Vidovdan Constitution, despite a boycott of the vote by the communists, and Croat and Slovene parties.
- June 30 – The death penalty is abolished in Sweden.
- July 1
- The Communist Party of China (CPC) is founded.
- A coal strike ends in England.
- July 2 – U.S. President Warren Harding signs a joint congressional resolution declaring an end to America's state of war with Germany, Austria and Hungary.
- July 4 – A new conservative government is formed in Italy by Ivanoe Bonomi.
- July 11
- July 14 – A Massachusetts jury finds Nicola Sacco and Bartolomeo Vanzetti guilty of first degree murder following a widely publicized trial.
- July 17 – The Republic of Mirdita is proclaimed near the Albanian-Serbian border with Yugoslav support.
- July 18 – The first BCG vaccination against tuberculosis is given.
- July 21 – Rif War – Battle of Annual: Spanish troops are dealt a crushing defeat at the hands of Abd el-Krim.
- July 22 – The Anglo-Irish truce, agreed 10 days earlier, is officially declared in London.
- July 23 – The Communist Party of China (CPC) launched the first time of founding National Congress, Communist party in China are established.
- July 26 – U.S. President Warren G. Harding receives Princess Fatima of Afghanistan and Stanley Clifford Weyman.
- July 27 – Researchers at the University of Toronto led by biochemist Frederick Banting announce the discovery of the hormone insulin.
- July 29 – Adolf Hitler becomes Führer of the Nazi Party.
- August – The United States formally ends World War I.
- August 5 – The first radio baseball game is broadcast; Harold Arlin announces the Pirates-Phillies game from Forbes Field over Westinghouse KDKA, in Pittsburgh.
- August 11 – The temperature reaches 39 degrees Celsius in Breslau; the heat wave continues elsewhere in Europe as well.
- August 23 – King Faisal I of Iraq is crowned in Baghdad.
- August 24 – R38-class airship ZR-2 explodes on her fourth test flight near Kingston upon Hull, England, killing 44 of the 49 Anglo-American crew on board.
- August 25 – Franklin Roosevelt, 39, is diagnosed with poliomyelitis following a two-week illness characterized by paralysis and fevers. He would be permanently disabled after this illness.
- August 26
- September 1 – Poplar Strike in London: Nine members of the Poplar borough council are arrested.
- September 7 – In Atlantic City, New Jersey, the first Miss America Pageant is held.
- September 8 – Sixteen-year-old Margaret Gorman wins the Atlantic City Pageant's Golden Mermaid trophy; pageant officials later dub her the first Miss America.
- September 12 – The Lotta Svärd women's paramilitary auxiliary is founded in Finland.
- September 13 – White Castle hamburger restaurant opens in Wichita, Kansas, the foundation of the world's first fast food chain.
- September 21 – The Oppau explosion occurs at BASF's nitrate factory in Oppau, Germany; 500—600 are killed.
- October 5 – The first broadcast of a World Series game on the radio, by Newark, New Jersey, station WJZ; Pittsburgh station KDKA; and a group of other commercial and amateur stations throughout the eastern United States.
- October 8 – The first Sweetest Day is staged in Cleveland, Ohio.
- October 10 – Teaching at the University of Szeged starts in the Kingdom of Hungary.
- October 13
- The Treaty of Kars is signed between the Grand National Assembly of Turkey and the Soviet Socialist Republics of Armenia, Azerbaijan and Georgia, establishing the boundaries between Turkey and the states of the south Caucasus.
- Swedish Social Democratic party leader Hjalmar Branting becomes yet again Prime Minister, after strong general election gains for his party.
- October 19 – 'Bloody Night' (Noite Sangrenta): A massacre in Lisbon claims the lives of Portuguese Prime-Minister António Granjo and other politicians.
- October 21
- October 24 – The Spanish Army defeats rifkabyl rebels in Morocco.
- October 29 – In the United States
- Construction of the Link River Dam, a part of the Klamath Project in Oregon, is completed.
- Centre College's American football team, led by quarterback Bo McMillin, defeats Harvard University 6–0 to break Harvard's five-year winning streak. For decades afterward, this is called "football's upset of the century."
- November 4 – After a speech by Adolf Hitler in the Hofbräuhaus in Munich (Germany), members of the Sturmabteilung ("brownshirts") physically assault his opposition.
- November 9
- November 11 – During an Armistice Day ceremony at Arlington National Cemetery, the Tomb of the Unknown Soldier is dedicated by Warren G. Harding, President of the United States.
- November 14 – The Spanish Communist Party is founded.
- November 23 – The Sheppard–Towner Act is signed by President Harding, providing federal funding for maternity and child care.
- Undated – Hyperinflation rampant in Germany, where 263 marks are now needed to buy a single American dollar, more than 20 times greater than the 12 marks needed in April 1919.
- December 1 – Rising prices cause riots in Vienna.
- December 6
- December 13 – In the Four-Power Treaty on Insular Possessions, Japan, the United States, United Kingdom, and France agree to recognize the status quo in the Pacific.
- December 23 – Visva-Bharati College is founded by Rabindranath Tagore in Santiniketan, Bengal Presidency, British India.
- December 29 – William Lyon Mackenzie King becomes Canada's tenth prime minister.
- Russian famine: Roughly 5,000,000 people die.
- Jewish immigration to Palestine grows rapidly after the United States drastically limits immigration from Eastern Europe.
- Regular radio broadcasting services begin in Italy.
- Edward Harper, the "father of broadcasting" in Ceylon, arrives in Colombo to take up his post as Chief Engineer of the Ceylon Telegraph Department.
- The vibraphone in its original form is invented in the United States.
- E. W. Scripps and William Emerson Ritter found Science Service, later renamed Society for Science and the Public, in the United States with the goal of keeping the public informed of scientific developments.
- The Sauerländer Heimatbund is founded in Meschede, Germany.
- Weimar Republic makes its first payment of reparations.[clarification needed]
- January 1
- January 5
- January 9
- January 10 – Rodger Ward, American race car driver (d. 2004)
- January 14 – Murray Bookchin, American libertarian socialist (d. 2006)
- January 19 – Patricia Highsmith, American author (d. 1995)
- January 21 – Howard Unruh, American spree killer (d. 2009)
- January 24 – Beatrice Mintz, American biologist
- January 26 – Akio Morita, Japanese businessman, co-founder of Sony (d. 1999)
- January 27 – Donna Reed, American actress (d. 1986)
- January 31
- February 1 – Peter Sallis, English actor (Last of the Summer Wine; Wallace and Gromit)
- February 4 – Betty Friedan, American feminist (d. 2006)
- February 5
- February 7 – Nexhmije Hoxha, widow of Enver Hoxha
- February 8
- February 11 – Lloyd Bentsen, American politician (d. 2006)
- February 14 – Hugh Downs, American game show host and journalist
- February 16
- February 17 – Muriel Coben, Canadian professional baseball and curling player (d. 1979)
- February 20 – "Nature Boy" Rogers, American professional wrestler (d. 1992)
- February 22
- February 24 – Abe Vigoda, American actor (d. 2016)
- February 25 – Pierre Laporte, Canadian statesman (d. 1970)
- February 26 – Betty Hutton, American actress (d. 2007)
- February 28 – Pierre Clostermann, French World War II pilot (d. 2006)
- March 1
- March 2 – Robert Simpson, English composer (d. 1997)
- March 3
- March 4
- March 5 – Elmer Valo, Czechoslovakia-born Major League Baseball player (d. 1998)
- March 8 – Alan Hale, Jr., American actor (Gilligan's Island) (d. 1990)
- March 11
- March 12
- March 13
- March 16 – King Faud of Saudi Arabia (d. 2005)
- March 14 – Lis Hartel, Danish equestrian athlete (d. 2009)
- March 17 – Meir Amit, Israeli politician and general (d. 2009)
- March 19 – Tommy Cooper, Welsh prop comedian and magician (d. 1984)
- March 20 – Alfréd Rényi, Hungarian mathematician (d. 1970)
- March 21 – Arthur Grumiaux, Belgian violinist (d. 1986)
- March 24
- March 25 – Simone Signoret, French actress (d. 1985)
- March 28 – Dirk Bogarde, English actor (d. 1999)
- April 1 – Beau Jack, American boxer (d. 2000)
- April 3
- April 8 – Franco Corelli, Italian opera singer (d. 2003)
- April 9
- April 10
- April 14 – Thomas Schelling, American economist, Nobel Prize laureate (d. 2016)
- April 15 – Georgy Beregovoy, Soviet cosmonaut (d. 1995)
- April 16 – Peter Ustinov, English actor and director (d. 2004)
- April 17 – Sergio Sollima, Italian director (d. 2015)
- April 19 – Roberto Tucci, Italian cardinal and theologian (d. 2015)
- April 22 – Vivian Dandridge, African-American actress (d. 1991)
- April 23
- April 25 – Karel Appel, Dutch painter (d. 2006)
- April 26 – Jimmy Giuffre, American jazz musician (d. 2008)
- April 27
- April 30
- May 2 – Satyajit Ray, Indian filmmaker (d. 1992)
- May 3 – Sugar Ray Robinson, American boxer (d. 1989)
- May 5 – Arthur Leonard Schawlow, American physicist, Nobel Prize laureate (d. 1999)
- May 6 – Erich Fried, Austrian author (d. 1988)
- May 9
- May 11 – Hildegard Hamm-Brücher, German politician (d. 2016)
- May 12
- May 14 – Richard Deacon, American actor (d. 1984)
- May 16 – Harry Carey, Jr., American actor (d. 2012)
- May 17 – Dennis Brain, English musician (d. 1957)
- May 18 – Sir Michael A. Epstein, British medical researcher
- May 19 – Karel van het Reve, Dutch writer (d. 1999)
- May 20
- May 21
- May 23
- May 25
- May 26 – Stan Mortensen, English footballer (d. 1991)
- May 28
- May 29
- June 1 – Nelson Riddle, American bandleader (d. 1985)
- June 3
- June 7
- June 8
- June 9 – Margaret Danhauser, American female professional baseball player (d. 1987)
- June 10 – Prince Philip, Duke of Edinburgh, consort of Elizabeth II
- June 12
- June 13 – Nancy Warren, American female professional baseball player (d. 2001)
- June 15 – Erroll Garner, American jazz musician (d. 1977)
- June 19 – Louis Jourdan, French actor (d. 2015)
- June 21
- June 22 – Ralph K. Hofer, American fighter pilot (d. 1942)
- June 23 – Paul Findley, American politician
- June 24 – Gerhard Sommer, German soldier
- June 25 – Celia Franca, Canadian ballet dancer (d. 2007)
- June 26 – Violette Szabo, French World War II heroine (d. 1945)
- June 27 – Muriel Pavlow, English actress
- June 28 – P. V. Narasimha Rao, Prime Minister of India (d. 2004)
- July 1
- July 3 – Levi Yitzchak Horowitz, Hasidic rebbe (d. 2009)
- July 4
- July 5 – Vito Ortelli, Italian racing cyclist
- July 6
- July 7 – Joe Wade, English footballer and manager (d. 2005)
- July 8 – Edgar Morin, French philosopher and sociologist
- July 10
- July 11
- July 13 – Friedrich Peter, Austrian politician (d. 2005)
- July 14
- July 15
- July 16
- July 17
- July 18
- July 19 – Rosalyn Sussman Yalow, American physicist, recipient of the Nobel Prize in Physiology or Medicine (d. 2011)
- July 22
- July 24 – Billy Taylor, American jazz musician (d. 2010)
- July 30 – Grant Johannesen, American concert pianist (d. 2005)
- August 3 – Richard Adler, American Broadway composer (d. 2012)
- August 4 – Maurice Richard, Canadian hockey player (d. 2000)
- August 8 – Esther Williams, American swimmer and actress (d. 2013)
- August 9
- August 10 – Yuki Shimoda, American actor (d. 1981)
- August 13 – Barney Liddell, American musician (d. 2003)
- August 15 – K. Kailasanatha Kurukkal, Researcher, Writer and Professor of Jaffna, Sri Lanka (d. 2000)
- August 18 – Zdzisław Żygulski, Jr., Polish art historian (d. 2015)
- August 19 – Gene Roddenberry, American television producer (d. 1991)
- August 21 – John Osteen, American televangelist (d. 1999)
- August 23 – Kenneth Arrow, American economist, Nobel Prize laureate
- August 25
- August 26
- August 27 – Georg Alexander, Duke of Mecklenburg, head of the House of Mecklenburg-Strelitz (d. 1996)
- August 28
- September 2 – Josephine Lenard, American professional baseball player (d. 2007)
- September 3 – Thurston Dart, English harpsichordist and conductor (d. 1971)
- September 8
- September 12
- September 13
- September 14 – Dario Vittori, Argentine actor (d. 2001)
- September 15 – Norma MacMillan, voice actress (d. 2001)
- September 17 – Virgilio Barco Vargas, 27th President of Colombia (d. 1997)
- September 24
- September 25 – Robert Muldoon, 31st Prime Minister of New Zealand (d. 1992)
- September 27
- September 30
- October 1 – James Whitmore, American actor (d. 2009)
- October 2 – Robert Runcie, Archbishop of Canterbury (d. 2000)
- October 4 – Francisco Morales Bermúdez, President of Peru
- October 5 – Bill Willis, American football player (d. 2007)
- October 7 – Tommy Farrell, American supporting actor and comedian (d. 2004)
- October 8 – Abraham Sarmiento, Filipino Supreme Court jurist (d. 2010)
- October 11 – Shaw McCutcheon, American cartoonist (d. 2016)
- October 13
- October 14
- October 17 – Maria Gorokhovskaya, Soviet gymnast (d. 2001)
- October 18
- October 19
- October 21
- October 22 – Georges Brassens, French singer-songwriter (d. 1981)
- October 23 – André Turcat, French aviator and first pilot of Concorde (d. 2016)
- October 24 – Sena Jurinac, Bosnian operatic soprano (d. 2011)
- October 25 – King Michael I of Romania
- October 26 – Frances Scott Fitzgerald, writer; daughter of F. Scott and Zelda Fitzgerald (d. 1986)
- October 27 – Warren Allen Smith, American gay rights activist, writer and humanities humanist (d. 2017)
- November 3 – Charles Bronson, American actor (d. 2003)
- November 5 – Princess Fawzia Fuad of Egypt (d. 2013)
- November 6 – James Jones, American writer (d. 1977)
- November 8 – Gene Saks, American actor and film director (d. 2015)
- November 10 – Owen Bush, American actor (d. 2001)
- November 11
- November 13 – Joonas Kokkonen, Finnish composer (d. 1996)
- November 14 – Brian Keith, American actor (d. 1997)
- November 17 – Albert Bertelsen, Danish artist
- November 20 – Dan Frazer, American actor (d. 2011)
- November 22 – Rodney Dangerfield, American actor and comedian (d. 2004)
- November 23 – Fred Buscaglione, Italian singer and actor (d. 1960)
- November 24 – John Lindsay, American lawyer and politician, Mayor of New York City (d. 2000)
- November 27 – Alexander Dubček, Slovak politician and First Secretary of the Central Committee of the Communist Party of Czechoslovakia (d. 1992)
- November 29 – Jackie Stallone, American astrologer and mother of Sylvester Stallone
- December 2 – Carlo Furno, Italian cardinal (d. 2015)
- December 3 – Phyllis Curtin, American soprano (d. 2016)
- December 4 – Deanna Durbin, Canadian singer (d. 2013)
- December 5 – Alvy Moore, American actor (d. 1997)
- December 6 – Otto Graham, American football player (d. 2003)
- December 11 – Liz Smith, British actress (d. 2016)
- December 15 – Alan Freed, American disc jockey, known for introducing rock and roll to mainstream radio (d. 1965)
- December 19 – Blaže Koneski, Macedonian poet and linguist (d. 1993)
- December 21
- December 23 – Marge Callaghan, Canadian female professional baseball player
- December 26 – Steve Allen, American actor, composer, comedian, and author (d. 2000)
- December 31 – Maurice Yaméogo, President of Upper Volta (d. 1993)
- January 1 – Theobald von Bethmann-Hollweg, 5th Chancellor of Germany (b. 1856)
- January 18 – Adolf von Hildebrand, German sculptor (b. 1847)
- January 29 – H. G. Haugan, Norwegian-born American railroad and banking executive (b. 1840)
- February 2 – Antonio Jacobsen, maritime artist (b. 1850)
- February 7 – John J. Gardner, American politician (b. 1845)
- February 8
- February 26 – Carl Menger, Austrian economist (b. 1840)
- February 27 – Schofield Haigh, English cricketer (b. 1871)
- March 1 – King Nicholas I of Montenegro (b. 1841)
- March 8 – Eduardo Dato, 3-Time Prime Minister of Spain (b. 1856) (assassinated)
- March 29 – John Burroughs, American naturalist and essayist (b. 1837)
- April 1 – Edmund Poë, British admiral (b. 1849)
- April 11 – Augusta Victoria of Schleswig-Holstein, last German Empress, wife of Wilhelm II (b. 1858)
- April 17 – Manwel Dimech, Maltese philosopher and social reformer (b. 1860)
- April 21 – Tom O'Brien, American Major League Baseball player (b. 1860)
- April 27 – Arthur Mold, English cricketer (b. 1863)
- May 5 – Alfred Hermann Fried, Austrian writer and pacifist, recipient of the Nobel Peace Prize (b. 1864)
- May 12 – Emilia Pardo Bazán, Spanish writer (b. 1851)
- May 19
- May 25 – Émile Combes, French politician, 69th Prime Minister of France (b. 1835)
- June 5 – Georges Feydeau, French playwright (b. 1862)
- June 18 – Eduardo Acevedo Díaz, Uruguayan writer (b. 1851)
- June 26 – Alfred Percy Sinnett, British writer (b. 1840)
- June 28 – Gyorche Petrov, Macedonian and Bulgarian revolutionary (b. 1865) (assassinated)
- June 29
- July 1 – Maurice Bailloud, French general (b. 1847)
- July 26 – Howard Vernon, Australian actor (b. 1848)
- August 2 – Enrico Caruso, Italian tenor (b. 1873)
- August 7 – Alexander Blok, Russian poet (b. 1880)
- August 8 – Juhani Aho, Finnish author and journalist (b. 1861)
- August 16 – Peter I of Serbia, King of Yugoslavia (b. 1844)
- August 19 – Georges Darien, French writer (b. 1862)
- August 31 – Karl von Bülow, German field marshal (b. 1846)
- September 2 – Henry Austin Dobson, English poet (b. 1840)
- September 7 – Alfred William Rich, English watercolour painter (b. 1856)
- September 9 – Virginia Rappe, American model and actress (b. 1895)
- September 11
- September 27 – Engelbert Humperdinck, German composer (b. 1854)
- October 12 – Philander C. Knox, American politician (b. 1853)
- October 17 – Yaa Asantewaa, Asante warrior queen (b. c. 1840)
- October 18 – Ludwig III of Bavaria, last king of Bavaria (b. 1845)
- October 21 – William Wallace Wotherspoon, American general (b. 1850)
- October 23 – John Boyd Dunlop, Irish Scottish-born inventor and veterinary surgeon (b. 1840)
- October 25 – Bat Masterson, American gunfighter (b. 1853)
- November 4 – Hara Takashi, Japanese politician, 10th Prime Minister of Japan (b. 1856) (assassinated)
- November 12 – Fernand Khnopff, Belgian painter (b. 1858)
- November 14 – Isabel, Princess Imperial of Brazil, daughter of Emperor Pedro II of Brazil (b. 1846)
- November 20 – Christina Nilsson, Swedish operatic soprano (b. 1843)
- November 26
- November 27 – Douglas Colin Cameron, Canadian politician (b. 1854)
- November 28 – `Abdu'l-Bahá, Persian religious leader (b. 1844)
- December 10 – George Ashlin, Irish architect (b. 1837)
- December 12 – Henrietta Swan Leavitt, American astronomer (b. 1868)
- December 16 – Camille Saint-Saëns, French composer (b. 1835)
- December 20
- December 31 – Boies Penrose, U.S. Senator from Pennsylvania (b. 1860)
- Physics – Albert Einstein
- Chemistry – Frederick Soddy
- Medicine – not awarded
- Literature – Anatole France
- Peace – Karl Hjalmar Branting, Christian Lous Lange
- Staff (3 July 1921). "Harding Ends War; Signs Peace Decree at Senator's Home. Thirty Persons Witness Momentous Act in Frelinghuysen Living Room at Raritan.". The New York Times.
- Driggs, Laurence La Tourette (September 7, 1921). "The Fall of the Airship". The Outlook. New York. 129: 14–15. Retrieved 2009-07-30.
- "Weimar Germany 1919-1933". Historyhome.co.uk. 2011-01-05. Retrieved 2013-03-19.
|Wikimedia Commons has media related to:|
- New International Year Book: 1921 (1922) online edition
- 1921 Aviation Comes North- NWT Historical Timeline- A Prince of Wales Northern Heritage Centre Online Exhibit