June 28 - Velimir Khlebnikov, Russian poet (b. 1885)
July 4 - Lothar von Richthofen, German pilot (b. 1894)
October 24 - George Cadbury, British chocolate and cocoa manufacturer (b. 1839)
November 7 - Sam Thompson, baseball player (b. 1860)
November 17 - Robert Comtesse, Swiss Federal Councillor (b. 1847)
November 18 - Marcel Proust, French novelist (b. 1871)
November 21 - Ricardo Flores Magón, Mexican anarchist (b. 1874).
November 24 - Robert Erskine Childers, Irish nationalist (executed) (b. 1870)
Events
January 1 - The Greek Constitution of 1822 is adopted by the First National Assembly of Epidaurus.
January 7 - Dáil Éireann ratifies the Anglo-Irish Treaty by a 64-57 vote.
January 10 - Arthur Griffith is elected President of the Irish Free State.
January 11 - First use of insulin to treat diabetes in a human patient.
January 28 - Knickerbocker Storm, Washington D.C.'s biggest snowfall, causes the city's greatest loss of life when the roof of the Knickerbocker Theater collapses.
February 6 - The Washington Naval Treaty was signed in Washington, DC, limiting the naval armaments of United States, Britain, Japan, France, and Italy.
February 8 - President Warren G. Harding introduces the first radio in the White House.
February 9 - Brazil becomes a member of the Berne Convention copyright treaty.
February 27 - A challenge to the Nineteenth Amendment to the United States Constitution, allowing women the right to vote, is rebuffed by the Supreme Court of the United States in Leser v. Garnett.
February 28 - The United Kingdom accepts the independence of Egypt.
March 10 - Mahatma Gandhi is arrested in India, tried for sedition, and sentenced to six years in prison, although he is released after two years in February 1924 after an operation for appendicitis.
March 15 - After Egypt gains nominal independence from the United Kingdom, Fuad I becomes King of Egypt.
March 18 - In India, Mohandas Gandhi is sentenced to six years in prison for civil disobedience. He would serve only 2 years.
March 18 - The first public celebration of Bat mitzvah, for the daughter of Rabbi Mordecai Kaplan, is held in New York City.
March 20 - The USS Langley is commissioned as the first United States Navy aircraft carrier.
April 3 - Joseph Stalin becomes the first General Secretary of the Communist Party of the Soviet Union.
April 7 - Teapot Dome scandal: United States Secretary of the Interior leases Teapot Dome petroleum reserves in Wyoming.
April 16 - The Treaty of Rapallo, in which Germany and the Soviet Union re-establish diplomatic relations between Berlin and Moscow, is signed.
April 21 - The first Aggie Muster is held as a remembrance for fellow Aggies who had died in the previous year.
May 10 - The United States annexes the Kingman Reef.
May 19 - The Young Pioneer organization of the Soviet Union is established.
May 30 - In Washington, D.C. the Lincoln Memorial is dedicated.
July 20 - The League of Nations awards mandates of Togoland to France and Tanganyika to the United Kingdom.
August 26 - The Turkish Army launches the last attack on Greeks in the Turkish War of Independence.
August 29 - Turkish forces set fire to Smyrna in Asia Minor.
August 30 - Battle of Dumlupinar, final battle in Greco-Turkish War (1919-1922) ("Turkish War of Independence").
September 7 - In Aydin, Turkey, independence of Aydin, from Greek occupation.
September 9 - Greco-Turkish War of 1919-1922 has ended with Turkish victory over the Greeks.
September 11 - The British Mandate of Palestine begins.
September 11 - The Treaty of Kars is ratified in Yerevan, Armenia.
September 11 - One of the Herald Sun of Melbourne, Australia's predecessor papers The Sun News-Pictorial is founded.
September 13 - The temperature (in the shade) at Al 'Aziziyah, Libya reaches a world record 57.7°C (135.9°F).
September 18 - Hungary is admitted to League of Nations.
September 23 - Gdynia Seaport Construction Act is passed by the Polish parliament.
October 6 - The great powers of World War I withdraw from Istanbul
October 18 - The British Broadcasting Company (later Corporation) is founded by a consortium, to establish a nationwide network of radio transmitters to provide a national broadcasting service.
October 27 - A referendum in Rhodesia rejects the country's annexation to the South African Union.
October 28 - March on Rome: Italian fascists led by Benito Mussolini march on Rome and take over the Italian government.
October 29 - The King of Italy, Victor Emmanuel III, appoints Benito Mussolini as Prime Minister.
October 30 - Benito Mussolini is made Prime Minister of Italy.
November 1 - The last sultan of the Ottoman Empire, Mehmed VI, abdicates.
November 4 - In Egypt, British archaeologist Howard Carter and his men find the entrance to King Tutankhamun's tomb in the Valley of the Kings.
November 12 - The Sigma Gamma Rho Sorority is founded on the campus of Butler University in Indianapolis, Indiana.
November 14 - The BBC begins radio service in the United Kingdom.
November 17 - Former Ottoman sultan Mehmed VI goes into exile in Italy.
November 21 - Rebecca Latimer Felton of Georgia takes the oath of office, becoming the first female United States Senator.
November 22 - Egyptology: Howard Carter, assisted by Lord Carnarvon, opens the tomb of Tutankhamun.
November 24 - Author and Irish Republican Army member Robert Erskine Childers is executed by an Irish Free State firing squad for illegally carrying a revolver.
November 26 - Howard Carter and Lord Carnarvon become the first people to enter the tomb of Egyptian King Tutankhamun in over 3000 years.
November 26 - Toll of the Sea debuts as the first general release film to use two-tone Technicolor (The Gulf Between was the first film to do so but it was not widely distributed).
November 29 - Howard Carter opens the tomb of Pharaoh Tutankhamun to the public.
December 6 - One year to the day after the signing of the Anglo-Irish Treaty, the Irish Free State comes into existence.
December 9 - Gabriel Narutowicz is announced the first president of Poland.
December 16 - President of Poland Gabriel Narutowicz is assassinated by Eligiusz Niewiadomski at the Zachęta Gallery in Warsaw.
December 27 - Japanese aircraft carrier Hôshô becomes the first purpose built aircraft carrier to be commissioned in the world.
December 30 - The Union of Soviet Socialist Republics is formed.
