January 3 - English explorer Howard Carter discovers the sarcophagus of Tutankhamen in the Valley of the Kings, near Luxor, Egypt.
January 21 - Vladimir Lenin dies; a lengthy power struggle emerges between Leon Trotsky and Joseph Stalin begins, culminating to the latter's consolidation of power c. 1928.
January 22 - Ramsay MacDonald becomes the first Labour Prime Minister.
January 24 - Petrograd, formerly Saint Petersburg, Russia, is renamed Leningrad.
January 25 - The 1924 Winter Olympics open in Chamonix, France (in the French Alps), inaugurating the Winter Olympic Games.
February 5 - The Royal Greenwich Observatory begin broadcasting the hourly time signals known as the Greenwich Time Signal or the "BBC pips".
February 8 - Capital punishment: The first state execution using gas in the United States takes place in Nevada.
February 12 - Calvin Coolidge becomes the first President of the United States to deliver a political speech on radio.
February 14 - The International Business Machines Corporation (IBM) is founded.
February 17 - In Miami, Florida, Johnny Weissmuller sets a new world record in the 100-yard freestyle swimming competition with a time of 52-2/5 seconds.
February 22 - Calvin Coolidge becomes the first President of the United States to deliver a radio broadcast from the White House.
March 3 - The 1400-year-old Islamic caliphate is abolished when Caliph Abdul Mejid II of the Ottoman Empire is deposed. The last remnant of the old regime gives way to the reformed Turkey of Kemal Atatürk.
March 3 - Free State of Fiume is annexed by Kingdom of Italy.
March 8 - The Castle Gate mine disaster kills 172 coal miners near Castle Gate, Utah.
March 16 - The free port of Fiume is formally annexed by Mussolini's fascist regime.
April 1 - Adolf Hitler is sentenced to five years in jail for his participation in the "Beer Hall Putsch". However, he spends only nine months in jail, during which he writes the book Mein Kampf.
April 1 - First revenue flight for Belgium's Sabena Airlines
April 15 - Rand McNally publishes its first road atlas.
April 17 - Metro-Goldwyn-Mayer studios is formed from a merger of Metro Pictures, Goldwyn Pictures, and the Louis B. Mayer Company.
April 18 - Simon & Schuster publishes the first Crossword Puzzle book.
May 3 - Aleph Zadik Aleph is formed in Omaha, Nebraska by Sam Beber.
May 10 - J. Edgar Hoover is appointed the Director of the United States' Federal Bureau of Investigation, and remains so until his death in 1972.
May 11 - Mercedes-Benz is formed by Gottlieb Daimler and Karl Benz merging the two companies.
May 21 - University of Chicago students Richard Loeb and Nathan Leopold, Jr. murder 14-year-old Bobby Franks in a "thrill killing".
May 29 - AEK Athens FC is established on the anniversary of the siege of Constantinople by the Turks.
May 31 - The Soviet Union signs an agreement with the Peking government, referring to Outer Mongolia as an "integral part of the Republic of China", whose "sovereignty" therein the Soviet Union promises to respect.
June 2 - U.S. President Calvin Coolidge signs the Indian Citizenship Act into law, granting citizenship to all Native Americans born within the territorial limits of the United States.
June 10 - Fascists kidnap and kill Italian socialist leader Giacomo Matteotti in Rome.
June 16 - The Whampoa Military Academy is founded.
June 26 - American occupying forces leave the Dominican Republic.
July 20 - Teheran, Persia comes under martial law after the American vice consul, Robert Imbrie, is killed by a religious mob enraged by rumors he had poisoned a fountain and killed several people.
July 24 - The World Chess Federation FIDE is founded in Paris.
August 4 - Diplomatic relations between Mexico and the Soviet Union are established.
August 26 - (August 13 Old Style) The Catastrophe of Smyrna, known as the Asia Minor Catastrophe to Greeks, occurs. The Ottoman army expels Greeks and other non-Turks from Asia Minor.
August 28 - Georgian opposition stages the August Uprising against the Soviet Union.
September 9 - Hanapepe Massacre occurs on Kauai, Hawaii.
September 17 - The Border Defence Corps is established in the Second Polish Republic for the defence of the eastern border against armed Soviet raids and local bandits.
October 2 - The Geneva Protocol is adopted as a means to strengthen the League of Nations.
October 22 - Toastmasters International is founded.
October 25 - The forged Zinoviev Letter is published in the Daily Mail, wrecking the British Labour Party's hopes of re-election.
October 27 - The Uzbek SSR is founded in the Soviet Union.
October 31 - World Savings Day is announced in Milan, Italy by the Members of the Association at the 1st International Savings Bank Congress (World Society of Savings Banks).
November 4 - Nellie Tayloe Ross of Wyoming is elected as the first female governor in the United States.
November 10 - Dion O'Banion, leader of the North Side Gang is assassinated in his flower shop by members of Johnny Torrio's gang, sparking the bloody gang war of the 1920s in Chicago.
November 11 - Prime Minister Alexandros Papanastasiou proclaims the first Greek Republic.
November 27 - In New York City, the first Macy's Thanksgiving Day Parade is held.
December 19 - The last Rolls-Royce Silver Ghost is sold in London, England.
