The year 1928 was a leap year.
6 January – 14 people drown in Thames floods.
January 6 - Pope Pius XI condemned the ecumenical movement.
January 7 – Suomen Kuvalehti organized a competition to replace the word advertising with a Finnish expression.
January 15 − The Parliament approved by 157−22 the new rules of the Diet, which replaced the 1906 Rules of the Diet.
January 17 - Lev Trotsky arrested by the OGPU, deported to Kazakhstan.
January 26 - The magnificent cinema Titania-Palast opened in Berlin. The theater is located in the current Steglitz-Zehlendorf district.
February 4 - Vienna's National Socialists demand a ban on the performances of Joséphine Baker, the American variety artist who visited Austria.
February 5 - Toto was played for the first time in Finland in the trotting competitions organized on the ice of Helsinki's North Port.
February 29 – was a leap day.
February 10 - First telephone connection between Germany and the United States.
February 11 - The Winter Olympics began in Sankt Moritz.
March 7 – Virittäjä-lehti's editor-in-chief E. A. Saarimaa won the advertising word replacement competition organized by Suomen Kuvalehti with his proposal "advertisement".
March 12 - The St. Francis Dam north of Los Angeles breaks. 600 dead.
March 12 – Malta became a British dominion.
March 22 - Soviet farmers organized riots due to the poor food supply situation in the country.
March 25 - Pope Pius XI condemned fascist school policies.
March 30 - In Italy, all youth movements, including the scout movement, were ordered to be abolished within 30 days, with the exception of the fascist youth movement.
April 12 – Bombing of the King of Italy in Milan, 17 bystanders killed.
April 12 - 14 - First east-west transatlantic flight. The place of departure was Dublin, Ireland, and the destination was Greenly Island, Canada, the plane was a German Junkers W33 Bremen.
April 14 - Earthquakes in Chirpan and Plovdiv, Bulgaria destroy 21,000 buildings. About 130 deaths.
April 18 – Viipur's Reippaa became the first Finnish ice hockey champion team.
April 20 - The Library Act came into force in Finland. A state library office was established under the school board, and master of philosophy Helle Cannelin was elected as its director.
April 22 – Lahti radio station started broadcasting.
April 22 - An earthquake destroys Korinthos, 200,000 buildings are destroyed.
April 29 - President Lauri Kristian Relander inaugurated the Lahti radio station.
May 2 - Pope Pius XI publicly disapproved of women's athletic competitions held in Rome.
May 15 - King Kristian X of Denmark arrived on a three-day state visit to Finland.
May 21 – Vyborg air crash: An Air Force Hansa-Brandenburg maritime action plane crashed into a street in Vyborg after losing its rudder. Two pilots of the plane and two civilians on the ground died in the accident.
May 23 – A bomb explodes at the Italian consulate in Buenos Aires, 22 dead
May 26 - The frescoes painted by Akseli Gallén-Kallela were unveiled at the National Museum of Finland.
June 2 - King Haakon VII of Norway arrived in Finland for a three-day state visit.
June 2 - In Finland, a 10-month nationwide port strike began in Finland, as demanded by the Finnish Transport Workers' Union, the collective agreement for the ports. The strike ended on April 16, 1929 with the union's defeat. During the strike, the employers used Vientirauu strikebreakers for port loading work.
June 4 − The Yrjönkatu swimming pool was inaugurated in Helsinki.
June 4 - Japanese officers