1925 1926 1927 - 1928 - 1929 1930 1931
1890s 1900s 1910s - 1920s - 1930s 1940s 1950s
- January 1 - Estonia changes its currency from mark to kroon.
- January 6-7 - River Thames floods in London - 14 drowned.
- January 7 - Moat at the Tower of London, previously drained in 1843 (and planted with grass), is completely refilled by a tidal wave.
- January 12 - U.S. murderer Ruth Snyder executed at Ossining.
- January 17 - OGPU arrests Lev Trotsky in Moscow; he assumes a status of passive resistance and is exiled to Turkestan.
- February 11 - II Olympic Winter Games open in St. Moritz, Switzerland
- February 12 - Heavy hail kills 11 in England
- February 20 - Swung parliament produced in Japan after the general election.
- February 25 - Charles Jenkins Laboratories of Washington, DC becomes the first holder of a television license from the Federal Radio Commission.
- March 12
- March 21 - Charles Lindbergh is presented the Medal of Honor for his first trans-Atlantic flight.
- March 26 - China Academy of Art founded in Hangzhou in Republic of China, first named National Academy of Art
- April 10 - Pineapple Primary - Republican Party primary elections in Chicago preceded by assassinations and bombings
- April 12 - Bomb attack against the Dictator of Italy in Milan - 17 bystanders dead
- April 22 - Earthquake destroys Corinth - 200.000 buildings destroyed
- May 10 - The first regular schedule of television programming begins in Schenectady, New York by the General Electric's television station W2XB (the station was popularly known as WGY Television; after its sister radio station, WGY).
- May 15 - Royal Flying Doctor Service of Australia, commenced operations
- May 23 - Bomb attack against Italian consulate in Buenos Aires - 22 dead, 41 injured
- May 24 - Airship Italia crashes on the North Pole; one of the occupants is Italian general Umberto Nobile
- May 30 - A rescue expedition leaves for the North Pole
- June 4 - Zhang Zuolin, President of the Republic of China and warlord, is killed by Japanese agents during the Huanggutun Incident.
- June 8 - By seizing Beijing and renaming it Běipíng, the NRA puts an end to the Fengtian warlords' Běiyáng government there.
- June 11 - Medical doctor's strike begins in Vienna
- June 14 - Students take over the medical wing of Rosario University in Argentina
- June 17 - Aviator Amelia Earhart starts her attempt to become the first woman to successfully pilot an aircraft across the Atlantic Ocean (she succeeded the next day).
- June 20 - Shooting incident in Yugoslavian parliament - Puniša Račić shoots 3 opposition representatives and injures three others
- June 24 - Swedish aeroplane rescues part of Italian North Pole expedition, including Umberto Nobile. Soviet icebreaker Krasin saves the rest July 12
- June 28 - The Great Gorge and International Railway switches to one-man crews for its trolleys in Canada.
- June 29 - New York Governor Alfred E. Smith becomes the first Catholic nominated by a major political party for U.S. President, at the Democratic National Convention in Houston, Texas.
- July 2
- July 6 - The world's largest hailstone falls in Potter, Nebraska.
- July 12 - Mexican aviator Emilio Carranza dies in a solo plane crash in the New Jersey Pine Barrens while returning from a goodwill flight to New York City.
- July 17 - José de León Toral assassinates Álvaro Obregón, president of Mexico.
- July 25 - U.S.A. recalls its troops from China
- July 27 - Tich Freeman becomes only bowler ever to take 200 first-class wickets before end of July.
- July 27 - publication of The Well of Loneliness by Radclyffe Hall.
- July 28 - Official opening ceremony of the 1928 Summer Olympics in Amsterdam.
- August 16 - Murderer Carl Panzram is arrested in Washington, DC after killing about 20 people.
- August 22 - Alfred E. Smith accepts the Democratic presidential nomination, with WGY/W2XB simulcasting the event on radio and television.
- August 25 - Ahmet Zogu proclaims himself King Zog I of Albania; he is crowned September 1
- August 26 - May Donoghue finds the remains of a snail in her gingerbeer, launching Donoghue v. Stevenson.
- August 27 - The Kellogg-Briand Pact was signed in Paris - it was the first treaty which outlawed aggressive war.
- August 29 - Club Deportivo Motagua of Honduras is founded.
- September 1 - Richard Byrd leaves New York for Arctic.
- September 3 - Alexander Fleming discovers Penicillin.
- September 11 - Kenmore's WMAK station starts broadcasting in Buffalo, New York.
- September 15 - Tich Freeman sets all-time record for number of wickets taken in an English cricket season.
- September 16 - The 1928 Okeechobee Hurricane kills at least 2,500 people in Florida.
- September 25 - Motorola is founded.
- October 2 - Saint Josemaria Escriva, founds Opus Dei
- October 7 - Haile Selassie crowned king (not yet emperor) of Abyssinia
- October 12 - An iron lung respirator is used for the first time at Children's Hospital, Boston.
- October 19 - William Edward Hickman is executed at San Quentin prison for the 1927 murder of Marian Parker.
- October 22 - Phi Sigma Alpha fraternity is founded at the University of Puerto Rico, Rio Piedras Campus.
- November 4 - At Park Central Hotel in Manhattan, Arnold Rothstein, New York City's most notorious gambler, is shot to death over a poker game.
- November 6
- November 10 - Hirohito was enthroned as Emperor of Japan.
- November 17 - The Boston Garden opens in Boston.
- December 3 - In Rio de Janeiro, a seaplane sent to greet Alberto Santos-Dumont crashed near Cap Arcona, killing all on board.
- December 5 - Police disperses Sicilian gangs' meeting in Cleveland
- December 21 - U.S. Congress approves the construction of The Boulder Dam, later renamed The Hoover Dam
- February 26 - Ariel Sharon, Israeli Prime Minister (d. 2014)
- February 27 - George P. Dietz, first White nationalist publisher on the Internet (d. 2007)
- March 10 - James Earl Ray, American assassin (d. 1998)