January
Main article: January 1927
January 1 – The Cristero War erupts in Mexico when Catholic rebels attack the government, which had placed heavy restrictions on the Catholic Church.
January 7 – The first transatlantic telephone call is made via radio from New York City to London.
January 9 – A military rebellion is crushed in Lisbon, Portugal.
January 15 – Teddy Wakelam gives the first sports commentary on BBC Radio.
January 19 – Great Britain sends troops to China to protect foreign nationals from spreading anti-foreign riots in Central China.
January 30 – Right-wing veterans and the Republican Schutzbund clash in Schattendorf, Austria, with two fatalities resulting (see also July 15).
February
Main article: February 1927
February – Werner Heisenberg formulates his famous uncertainty principle while employed as a lecturer at Niels Bohr's Institute for Theoretical Physics at the University of Copenhagen.
February 12 – The first British troops land in Shanghai.
February 14 – An earthquake in Yugoslavia kills 100.
February 19
A general strike in Shanghai protests the presence of British troops.
In the United States, the silent romantic comedy film It starring Clara Bow, is released, popularising the concept of the "It girl".
February 23 – The U.S. Federal Radio Commission (later renamed the Federal Communications Commission) begins to regulate the use of radio frequencies.
March
Main article: March 1927
March 4 – A diamond rush in South Africa includes trained athletes that have been hired by major companies to stake claims.
March 7 – A Richter Scale 7.6 magnitude earthquake kills at least 2,925 at Toyooka and Mineyama area, in western Honshu, Japan.
March 10 – Albania mobilizes in case of an attack by Yugoslavia.
March 11
In New York City, the Roxy Theatre is opened by Samuel Roxy Rothafel.
The first armored car robbery is committed by the Flatheads Gang near Pittsburgh.
March 13 – Fritz Lang's culturally influential film Metropolis premieres in Germany.
March 24 – Nanjing Incident: After six foreigners have been killed in Nanjing and it appears that Kuomintang and Communist Party of China forces would overrun the foreign consulates, warships of the U.S. Navy and the British Royal Navy fire shells and shot to disperse the crowds.
April
Main article: April 1927
April 1 – The U.S. Bureau of Prohibition is founded (under the Department of the Treasury).
April 5 – In Britain, the Trade Disputes and Trade Union Act 1927 forbids strikes of support.
April 7 – Bell Telephone Co. transmits an image of Herbert Hoover (then the Secretary of Commerce), which becomes the first successful long distance demonstration of television.
April 12
The Royal and Parliamentary Titles Act 1927 renames the United Kingdom of Great Britain and Ireland as the United Kingdom of Great Britain and Northern Ireland. The change acknowledges that the Irish Free State is no longer part of the Kingdom.
Kuomintang troops kill a number of communist-supporting workers in Shanghai. The incident is called the April 12 Incident, or the Shanghai Massacre. The 1st United Front between the Nationalists and Communist ends, and the Civil War lasting until 1949 begins.
April 14 – The first Volvo automobile rolled off the production line in Gothenburg, Sweden.
April 18 – The Kuomintang (Nationalist Chinese) set up a government in Nanking, China.
April 21 – A banking crisis hits Japan.
April 22–May 5 – The Great Mississippi Flood of 1927 strikes 700,000 people in the greatest natural disaster in American history through that time.
April 27
The Carabineros de Chile (Chilean national police force and gendarmery) are created.
João Ribeiro de Barros becomes the first non-European to make a transatlantic flight, flying from Genoa, Italy, to Fernando de Noronha, Brazil.
May
Main article: May 1927
May – Philo Farnsworth of the United States transmits his first experimental electronic TV motion pictures, as opposed to the electromechanical TV systems that others had used before.
May 9 – The Australian Parliament convenes for the first time in Canberra, Australian Capital Territory. Previously, the Parliament had met in Melbourne, State of Victoria.
May 11 – The Academy of Motion Picture Arts and Sciences, the "Academy" in "Academy Awards", is founded.
May 12 – British police officers raid the office of the Soviet trade delegation in London.
May 13 – King George V proclaims the change of his title from King of the United Kingdom of Great Britain and Ireland to King of Great Britain and Northern Ireland.
May 17 – U.S. Army aviation pioneer Major Harold Geiger dies in the crash of his Airco DH-4 airplane, at Olmsted Field, Pennsylvania.
May 18 – Bath School bombings: Criminal bombings result in 45 deaths, mostly of school children, in Bath Township, Michigan.
May 20 – By the Treaty of Jeddah, the United Kingdom recognizes the sovereignty of Ibn Saud over the Kingdom of Nejd and Hejaz, the future Saudi Arabia.
May 20–21 – Charles Lindbergh makes the first solo, nonstop transatlantic airplane flight, carried out from New York City to Paris, France, in his single-engined aircraft, the Spirit of St. Louis.
May 22 – A magnitude 8.6 earthquake in Xining, China kills about 200,000 people.
May 23 – Nearly 600 members of the American Institute of Electrical Engineers and the Institute of Radio Engineers view a live demonstration of television at the Bell Telephone Building in New York City, just over a year after John Logie Baird of Scotland had first demonstrated an electromechanical television system to the members of the Royal Society in London.
May 24 – The United Kingdom cuts its diplomatic relations with the Soviet Union due to revelations of espionage and underground agitation.
May 20: Solo flight New York to Paris.
June
Main article: June 1927
June 4 – Yugoslavia severs diplomatic relations with Albania.
June 4–6 – Clarence Chamberlain and Charles Albert Levine take off from Roosevelt Field, New York, and fly to Eisleben, Germany, in the Wright-Bellanca WB-2 Columbia aircraft Miss Columbia, two weeks after Charles Lindbergh's historic solo flight.
June 7 – Peter Voikov, the Soviet ambassador to Poland, is murdered.
June 9 – The Soviet Union executes 20 for alleged espionage.
June 13
Léon Daudet, the leader of the French monarchists, is arrested in France.
A ticker-tape parade is held for the aviator Charles Lindbergh down 5th Avenue in New York City.
June 28: Iberia Spanish Airlines is established.
June 29 – A total eclipse of the sun takes place over Wales, northern England, southern Scotland, Norway, northern Sweden, northmost Finland, and the northmost extremes of Russia.
June 29-July 1 – Commander Richard E. Byrd, Bernt Balchen, George Noville, and Bert Acosta take off from Roosevelt Field, New York, in the Fokker Trimotor airplane America and cross the Atlantic to the coast of France, having to ditch there because of bad weather. All four men survive the emergency landing.
July
Main article: July 1927
July 1 – The Food, Drug, and Insecticide Administration (FDIA) is established.
July 10 – Kevin O'Higgins, the Vice-President of the Irish Free State, is assassinated in Dublin.
July 11 – An earthquake strikes Palestine, killing around 300 people. The effects are especially severe in Nablus, but damage and fatalities are also reported in many areas of Palestine and Transjordan such as Amman, Salt, Jordan, and Lydda.
July 13 – On this day the Rebbe (R. Yosef Yitzchak) is actually freed. The imprisonment began at 2:15 a.m. on Wednesday, Sivan 15, 5687 (June 15, 1927). He remained in exile - in the town of Kostrama - Russia until one half-hour past mid-day, Wednesday, Tamuz 13, 5687 (July 13, 1927).
July 15 – 85 protesters and five policemen are left dead after left-wing protesters and the Austrian police clash in Vienna. More than 600 people are injured. See Massacre of July 15, 1927.
July 24 – The Menin Gate War Memorial is dedicated at Ypres, Belgium.
August
Main article: August 1927
August 1 – The Communist Chinese People's Liberation Army is formed during the Nanchang Uprising.
August 2 – U.S. President Calvin Coolidge announces, "I do not choose to run for President in 1928."
August 7 – The Peace Bridge opens between Fort Erie, Ontario and Buffalo, New York.
August 10 – The Mount Rushmore Park is rededicated. President Calvin Coolidge promises national funding for the proposed carving of the Presidential figures.
August 22 – 200 people demonstrate in Hyde Park, London against the death sentencing of Italian immigrant anarchists Sacco and Vanzetti.
August 23 – Sacco and Vanzetti are executed.
August 24 – August 25 – Hurricane hits the Atlantic Provinces of Canada, causing massive damage and at least 56 deaths.
August 26 – Paul R. Redfern leaves Brunswick, Georgia, flying his Stinson Detroiter "Port of Brunswick" to attempt a solo nonstop flight to Rio de Janeiro, Brazil. He later crashes in the Venezuelan jungle, but the crash site has never been found.
September
Main article: September 1927
September – The Autumn Harvest Uprising occurs in China.
September 7 – The University of Minas Gerais is founded in Brazil.
September 14 – An underwater earthquake in Japan kills over 100 people.
September 18 – The Columbia Phonographic Broadcasting System (later known as CBS) is formed and goes on the air with 47 radio stations.
September 25 – A treaty signed by the League of Nations Slavery Commission abolishes all types of slavery.
September 27 – 79 are killed and 550 are injured in the East St. Louis Tornado, the 2nd costliest and at least 24th deadliest tornado in U.S. history.
October
Main article: October 1927
October – The Fifth Solvay Conference, held in the latter half of the month, establishes the acceptance of the Copenhagen interpretation.
October 4 – The actual carving begins at Mount Rushmore, South Dakota.
October 6 – The Jazz Singer opens in the United States and it becomes a huge success, although silent films continue to be made for some time.
October 8 – Murderers' Row: The New York Yankees complete a four-game sweep of the Pittsburgh Pirates in the World Series.
October 9 – The Mexican government crushes a rebellion in Vera Cruz.
October 18 – The first flight of Pan American Airways takes off from Key West, Florida, bound for Havana, Cuba.
October 27
The Italian steamer ship Principessa Mafalda capsizes off Porto Seguro, Brazil. At least 314 people are killed.
Queen Wilhelmina of the Netherlands opens the Meuse-Waal Canal in Nijmegen, Holland
At 5:50 a.m. a ground fault gives way, causing the mine and part of the town of Worthington to collapse into a large chasm located in Ontario. Nobody is injured in the incident, as the area had been evacuated the night before after a mine foreman noticed abnormal rock shifts in the mine.
November
Main article: November 1927
November 1 – İsmet İnönü forms a new government in Turkey (The 5th government).
November 3 – November 4 – Floods devastating Vermont cause the "worst natural disaster in the state's history". November 4 – Frank Heath and his horse Gypsy Queen return to Washington, D.C., having completed a two-year journey of 11,356 miles to all 48 of the states (of that time).
November 12
Mahatma Gandhi makes his first and last visit to Ceylon.
Leon Trotsky is expelled from the Soviet Communist Party, leaving Joseph Stalin with undisputed control of the Soviet Union.
The Holland Tunnel opens to traffic as the first vehicular tunnel under the Hudson River linking New Jersey with New York City.
November 14 – The Pittsburgh Gasometer Explosion: Three Equitable Gas storage tanks in the North Side of Pittsburgh explode, killing 26 people and causing damage estimated between $4.0 million and $5.0 million.
November 21 – The Colorado state police open fire on 500 rowdy but unarmed miners during a strike, killing six of them.
December
Main article: December 1927
December – The Communist Party Congress condemns all deviation from the general party line in the USSR.
December 2 – Following 19 years of Ford Model T production, the Ford Motor Company unveils the Ford Model A as its new automobile.
December 14 – Iraq gains independence from Britain.
December 15 – Marion Parker, 12, is kidnapped in Los Angeles. Her dismembered body is found on December 19, prompting the largest manhunt to date on the West Coast for her killer, William Edward Hickman, who is arrested on December 22 in Oregon.
December 17 – The U.S. submarine S-4 is accidentally rammed and sunk by the United States Coast Guard cutter John Paulding off Provincetown, Massachusetts, killing everyone aboard despite several unsuccessful attempts to raise the submarine.
December 19 –3 Indian Revolutionaries, viz Pandit Ram Prasad Bismil, Thakur Roshan Singh, and Ashfaqulla Khan, are executed by the British Raj. Rajendra Nath Lahiri had been executed two days before.
December 27 – Kern and Hammerstein's musical play, Show Boat, based on Edna Ferber's novel, opens on Broadway and then goes on to become the first great classic of the American musical theater.
December 30 – The first Japanese commuter metro line, the Ginza Line in Tokyo, opens.
Main article: January 1927
January 1 – The Cristero War erupts in Mexico when Catholic rebels attack the government, which had placed heavy restrictions on the Catholic Church.
January 7 – The first transatlantic telephone call is made via radio from New York City to London.
January 9 – A military rebellion is crushed in Lisbon, Portugal.
January 15 – Teddy Wakelam gives the first sports commentary on BBC Radio.
January 19 – Great Britain sends troops to China to protect foreign nationals from spreading anti-foreign riots in Central China.
January 30 – Right-wing veterans and the Republican Schutzbund clash in Schattendorf, Austria, with two fatalities resulting (see also July 15).
February
Main article: February 1927
February – Werner Heisenberg formulates his famous uncertainty principle while employed as a lecturer at Niels Bohr's Institute for Theoretical Physics at the University of Copenhagen.
February 12 – The first British troops land in Shanghai.
February 14 – An earthquake in Yugoslavia kills 100.
February 19
A general strike in Shanghai protests the presence of British troops.
In the United States, the silent romantic comedy film It starring Clara Bow, is released, popularising the concept of the "It girl".
February 23 – The U.S. Federal Radio Commission (later renamed the Federal Communications Commission) begins to regulate the use of radio frequencies.
March
Main article: March 1927
March 4 – A diamond rush in South Africa includes trained athletes that have been hired by major companies to stake claims.
March 7 – A Richter Scale 7.6 magnitude earthquake kills at least 2,925 at Toyooka and Mineyama area, in western Honshu, Japan.
March 10 – Albania mobilizes in case of an attack by Yugoslavia.
March 11
In New York City, the Roxy Theatre is opened by Samuel Roxy Rothafel.
The first armored car robbery is committed by the Flatheads Gang near Pittsburgh.
March 13 – Fritz Lang's culturally influential film Metropolis premieres in Germany.
March 24 – Nanjing Incident: After six foreigners have been killed in Nanjing and it appears that Kuomintang and Communist Party of China forces would overrun the foreign consulates, warships of the U.S. Navy and the British Royal Navy fire shells and shot to disperse the crowds.
April
Main article: April 1927
April 1 – The U.S. Bureau of Prohibition is founded (under the Department of the Treasury).
April 5 – In Britain, the Trade Disputes and Trade Union Act 1927 forbids strikes of support.
April 7 – Bell Telephone Co. transmits an image of Herbert Hoover (then the Secretary of Commerce), which becomes the first successful long distance demonstration of television.
April 12
The Royal and Parliamentary Titles Act 1927 renames the United Kingdom of Great Britain and Ireland as the United Kingdom of Great Britain and Northern Ireland. The change acknowledges that the Irish Free State is no longer part of the Kingdom.
Kuomintang troops kill a number of communist-supporting workers in Shanghai. The incident is called the April 12 Incident, or the Shanghai Massacre. The 1st United Front between the Nationalists and Communist ends, and the Civil War lasting until 1949 begins.
April 14 – The first Volvo automobile rolled off the production line in Gothenburg, Sweden.
April 18 – The Kuomintang (Nationalist Chinese) set up a government in Nanking, China.
April 21 – A banking crisis hits Japan.
April 22–May 5 – The Great Mississippi Flood of 1927 strikes 700,000 people in the greatest natural disaster in American history through that time.
April 27
The Carabineros de Chile (Chilean national police force and gendarmery) are created.
João Ribeiro de Barros becomes the first non-European to make a transatlantic flight, flying from Genoa, Italy, to Fernando de Noronha, Brazil.
May
Main article: May 1927
May – Philo Farnsworth of the United States transmits his first experimental electronic TV motion pictures, as opposed to the electromechanical TV systems that others had used before.
May 9 – The Australian Parliament convenes for the first time in Canberra, Australian Capital Territory. Previously, the Parliament had met in Melbourne, State of Victoria.
May 11 – The Academy of Motion Picture Arts and Sciences, the "Academy" in "Academy Awards", is founded.
May 12 – British police officers raid the office of the Soviet trade delegation in London.
May 13 – King George V proclaims the change of his title from King of the United Kingdom of Great Britain and Ireland to King of Great Britain and Northern Ireland.
May 17 – U.S. Army aviation pioneer Major Harold Geiger dies in the crash of his Airco DH-4 airplane, at Olmsted Field, Pennsylvania.
May 18 – Bath School bombings: Criminal bombings result in 45 deaths, mostly of school children, in Bath Township, Michigan.
May 20 – By the Treaty of Jeddah, the United Kingdom recognizes the sovereignty of Ibn Saud over the Kingdom of Nejd and Hejaz, the future Saudi Arabia.
May 20–21 – Charles Lindbergh makes the first solo, nonstop transatlantic airplane flight, carried out from New York City to Paris, France, in his single-engined aircraft, the Spirit of St. Louis.
May 22 – A magnitude 8.6 earthquake in Xining, China kills about 200,000 people.
May 23 – Nearly 600 members of the American Institute of Electrical Engineers and the Institute of Radio Engineers view a live demonstration of television at the Bell Telephone Building in New York City, just over a year after John Logie Baird of Scotland had first demonstrated an electromechanical television system to the members of the Royal Society in London.
May 24 – The United Kingdom cuts its diplomatic relations with the Soviet Union due to revelations of espionage and underground agitation.
May 20: Solo flight New York to Paris.
June
Main article: June 1927
June 4 – Yugoslavia severs diplomatic relations with Albania.
June 4–6 – Clarence Chamberlain and Charles Albert Levine take off from Roosevelt Field, New York, and fly to Eisleben, Germany, in the Wright-Bellanca WB-2 Columbia aircraft Miss Columbia, two weeks after Charles Lindbergh's historic solo flight.
June 7 – Peter Voikov, the Soviet ambassador to Poland, is murdered.
June 9 – The Soviet Union executes 20 for alleged espionage.
June 13
Léon Daudet, the leader of the French monarchists, is arrested in France.
A ticker-tape parade is held for the aviator Charles Lindbergh down 5th Avenue in New York City.
June 28: Iberia Spanish Airlines is established.
June 29 – A total eclipse of the sun takes place over Wales, northern England, southern Scotland, Norway, northern Sweden, northmost Finland, and the northmost extremes of Russia.
June 29-July 1 – Commander Richard E. Byrd, Bernt Balchen, George Noville, and Bert Acosta take off from Roosevelt Field, New York, in the Fokker Trimotor airplane America and cross the Atlantic to the coast of France, having to ditch there because of bad weather. All four men survive the emergency landing.
July
Main article: July 1927
July 1 – The Food, Drug, and Insecticide Administration (FDIA) is established.
July 10 – Kevin O'Higgins, the Vice-President of the Irish Free State, is assassinated in Dublin.
July 11 – An earthquake strikes Palestine, killing around 300 people. The effects are especially severe in Nablus, but damage and fatalities are also reported in many areas of Palestine and Transjordan such as Amman, Salt, Jordan, and Lydda.
July 13 – On this day the Rebbe (R. Yosef Yitzchak) is actually freed. The imprisonment began at 2:15 a.m. on Wednesday, Sivan 15, 5687 (June 15, 1927). He remained in exile - in the town of Kostrama - Russia until one half-hour past mid-day, Wednesday, Tamuz 13, 5687 (July 13, 1927).
July 15 – 85 protesters and five policemen are left dead after left-wing protesters and the Austrian police clash in Vienna. More than 600 people are injured. See Massacre of July 15, 1927.
July 24 – The Menin Gate War Memorial is dedicated at Ypres, Belgium.
August
Main article: August 1927
August 1 – The Communist Chinese People's Liberation Army is formed during the Nanchang Uprising.
August 2 – U.S. President Calvin Coolidge announces, "I do not choose to run for President in 1928."
August 7 – The Peace Bridge opens between Fort Erie, Ontario and Buffalo, New York.
August 10 – The Mount Rushmore Park is rededicated. President Calvin Coolidge promises national funding for the proposed carving of the Presidential figures.
August 22 – 200 people demonstrate in Hyde Park, London against the death sentencing of Italian immigrant anarchists Sacco and Vanzetti.
August 23 – Sacco and Vanzetti are executed.
August 24 – August 25 – Hurricane hits the Atlantic Provinces of Canada, causing massive damage and at least 56 deaths.
August 26 – Paul R. Redfern leaves Brunswick, Georgia, flying his Stinson Detroiter "Port of Brunswick" to attempt a solo nonstop flight to Rio de Janeiro, Brazil. He later crashes in the Venezuelan jungle, but the crash site has never been found.
September
Main article: September 1927
September – The Autumn Harvest Uprising occurs in China.
September 7 – The University of Minas Gerais is founded in Brazil.
September 14 – An underwater earthquake in Japan kills over 100 people.
September 18 – The Columbia Phonographic Broadcasting System (later known as CBS) is formed and goes on the air with 47 radio stations.
September 25 – A treaty signed by the League of Nations Slavery Commission abolishes all types of slavery.
September 27 – 79 are killed and 550 are injured in the East St. Louis Tornado, the 2nd costliest and at least 24th deadliest tornado in U.S. history.
October
Main article: October 1927
October – The Fifth Solvay Conference, held in the latter half of the month, establishes the acceptance of the Copenhagen interpretation.
October 4 – The actual carving begins at Mount Rushmore, South Dakota.
October 6 – The Jazz Singer opens in the United States and it becomes a huge success, although silent films continue to be made for some time.
October 8 – Murderers' Row: The New York Yankees complete a four-game sweep of the Pittsburgh Pirates in the World Series.
October 9 – The Mexican government crushes a rebellion in Vera Cruz.
October 18 – The first flight of Pan American Airways takes off from Key West, Florida, bound for Havana, Cuba.
October 27
The Italian steamer ship Principessa Mafalda capsizes off Porto Seguro, Brazil. At least 314 people are killed.
Queen Wilhelmina of the Netherlands opens the Meuse-Waal Canal in Nijmegen, Holland
At 5:50 a.m. a ground fault gives way, causing the mine and part of the town of Worthington to collapse into a large chasm located in Ontario. Nobody is injured in the incident, as the area had been evacuated the night before after a mine foreman noticed abnormal rock shifts in the mine.
November
Main article: November 1927
November 1 – İsmet İnönü forms a new government in Turkey (The 5th government).
November 3 – November 4 – Floods devastating Vermont cause the "worst natural disaster in the state's history". November 4 – Frank Heath and his horse Gypsy Queen return to Washington, D.C., having completed a two-year journey of 11,356 miles to all 48 of the states (of that time).
November 12
Mahatma Gandhi makes his first and last visit to Ceylon.
Leon Trotsky is expelled from the Soviet Communist Party, leaving Joseph Stalin with undisputed control of the Soviet Union.
The Holland Tunnel opens to traffic as the first vehicular tunnel under the Hudson River linking New Jersey with New York City.
November 14 – The Pittsburgh Gasometer Explosion: Three Equitable Gas storage tanks in the North Side of Pittsburgh explode, killing 26 people and causing damage estimated between $4.0 million and $5.0 million.
November 21 – The Colorado state police open fire on 500 rowdy but unarmed miners during a strike, killing six of them.
December
Main article: December 1927
December – The Communist Party Congress condemns all deviation from the general party line in the USSR.
December 2 – Following 19 years of Ford Model T production, the Ford Motor Company unveils the Ford Model A as its new automobile.
December 14 – Iraq gains independence from Britain.
December 15 – Marion Parker, 12, is kidnapped in Los Angeles. Her dismembered body is found on December 19, prompting the largest manhunt to date on the West Coast for her killer, William Edward Hickman, who is arrested on December 22 in Oregon.
December 17 – The U.S. submarine S-4 is accidentally rammed and sunk by the United States Coast Guard cutter John Paulding off Provincetown, Massachusetts, killing everyone aboard despite several unsuccessful attempts to raise the submarine.
December 19 –3 Indian Revolutionaries, viz Pandit Ram Prasad Bismil, Thakur Roshan Singh, and Ashfaqulla Khan, are executed by the British Raj. Rajendra Nath Lahiri had been executed two days before.
December 27 – Kern and Hammerstein's musical play, Show Boat, based on Edna Ferber's novel, opens on Broadway and then goes on to become the first great classic of the American musical theater.
December 30 – The first Japanese commuter metro line, the Ginza Line in Tokyo, opens.