- January 6 - The first diesel-engine automobile trip is completed (Indianapolis, Indiana, to New York City).
- January 27 - Miguel Primo de Rivera resigns
- January 30 - General Damaso Berenquer becomes the new prime minister of Spain
- February 18 - While studying photographs taken in January, Clyde Tombaugh discovers Pluto
- February 18 - Elm Farm Ollie becomes the first cow to fly in an airplane and also the first cow to be milked in an airplane.
- March 2 - Mohandas Gandhi informs British viceroy of India that civil disobedience would begin nine days later
- March 5 - Danish painter Einar Wegener goes through a sexual reassignment surgery and takes the name Lili Elbe
- March 6 - First frozen food products in USA
- March 12 - Mohandas Gandhi sets off to a 200-mile protest march towards the sea with 78 followers to protest the British monopoly on salt - more will join them during the Salt March that ends in April 5
- March 28 - Constantinople and Angora change their names to Istanbul and Ankara
- March 29 - [[Heinrich Br�ning]] is appointed German Reichskanzler.
- March 31 - The Motion Pictures Production Code is instituted, imposing strict guidelines on the treatment of sex, crime, religion and violence in motion pictures for the next forty years.
- April 5 - In an act of civil disobedience, Mahatma Gandhi breaks British law after marching to the sea and making salt.
- April 6 - Hostess Twinkies are invented.
- April 21 - Fire in Ohio State Penitentiary near Columbus kills 320
- April 22 - The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
- April 28 - The first night game in organized baseball history takes place in Independence, Kansas.
- May 4-5 - Mohandas Gandhi is arrested again
- May 15 - Aboard a Boeing tri-motor, Ellen Church becomes the first airline stewardess (the flight was from Oakland, California to Chicago, Illinois).
- May 17 - French foreign minister [[Andr� Tardieu]] decides to withdraw the remaining French troops from the Rheinland. They depart by June 30
- May 20 - Sergei Eisenstein arrives to New York City
- May 24 - Amy Johnson lands in Darwin, Australia becoming the first woman to fly from England to Australia (she left on May 5 for the 11,000 mile flight).
- May 30 - Sergei Eisenstein arrives to Hollywood to work for Paramount Pictures - they part ways by October
- June 9 - Chicago Tribune journalist Alfred Liddle is shot in Chigaco, Illinois, USA. Newspapers promise $55,000 reward for information. Liddle is later found to have had contacts to organized crime
- June 17 - U.S. President Herbert Hoover signs the Smoot-Hawley Tariff into law.
- June 17 - Bonus Army: Around a thousand World War I veterans mass at the United States Capitol as the U.S. Senate considers a bill that would give them certain benefits.
- June 21 - One-year conscription comes into force in France
- July 7 - Lapua Movement marches in Helsinki, Finland
- July 7 - Building of the Boulder Dam (now known as Hoover Dam) is started.
- July 30 - Uruguay beat Argentina in the first football World Cup Final
- July 31 - The radio mystery program The Shadow airs for the first time.
- August 7 - Richard Bedford Bennett becomes Canada's eleventh prime minister.
- August 9 - Betty Boop premiers in the animated film Dizzy Dishes.
- August 12 - Turkish troops move into Persia to fight Kurdish insurgents
- August 27 - Military junta takes over in Peru
- September 6 - Josef Felix Urileu makes a successful military coup in Argentina
- September 14 - National socialists win 107 seats in German parliament - 18.3% of all the votes makes them second largest party
- September 16 - overthrow of [[Hip�lito Yrigoyen]], President of Argentina.
- October 5 - British Airship R101 crashed in France en-route to India on its maiden voyage.
- October 24 - Brazil - Revolution of 1930 by Getulio Vargas
- November 2 - Haile Selassie is crowned emperor of Ethiopia.
- December 2 - Great Depression: US President Herbert Hoover goes before Congress and asks for a US$150 million public works program to help generate jobs and stimulate the economy.
- December 19 - Merap volcano erupts - 1300 dead
- December 28 - Mohandas Gandhi leaves for Britain for negotiations
- British White Paper demands restrictions on Jewish immigration into Palestine
- [[Rafael Le�nidas Trujillo]] takes over in the Dominican Republic
- Federal Bureau of Narcotics replaces the Narcotics Division of the Prohibition Unit (predecessor of DEA
- Walther Bothe and H. Becker discover neutron
Year in topic
- 1930 in aviation
- 1930 in film
- 1930 in literature
- 1930 in music
- 1930 in sports
- 1930 in television
- May 22 - An audience at Proctor's Theatre in Schenectady becomes the first to see a closed-circuit television signal projected onto a big screen.
- November - W9XAP in Chicago broadcasts the U.S. senatorial election returns, which was apparently the first time a senatorial race, with non-stop vote tallies, was ever televised
- December 7 - W1XAV in Boston broadcasts video from a CBS radio program, The Fox Trappers orchestra program. The broadcast also included the first television commercial (for I. J. Fox Furriers, who sponsored the radio show)
- The BBC begins regular television transmission
- January 3 - Robert Loggia, actor
- January 4 - Don Shula, American football coach
- January 10 - Roy Edward Disney, film executive
- January 11 - Rod Taylor, Australian actor
- January 12 - Tim Horton, NHL player, Hockey Hall of Famer, founder of Tim Hortons doughnut shops (d. 1974)
- January 12 - Glenn Yarborough, singer, songwriter
- January 13 - Frances Sternhagen, actress
- January 20 - Buzz Aldrin, astronaut, second person to walk on Earth's Moon
- January 23 - Derek Walcott, author
- January 25 - Dean Jones, actor
- January 30 - Gene Hackman, actor
- February 3 - Gillian Ayres, painter
- February 10 - Robert Wagner, actor
- February 11 - Alevtina Koltschina Soviet skier.
- February 11 - C. H. Dearnley, organist.
- February 13 - Ernst Fuchs, painter and graphic artist
- February 17 - Ruth Barbara Rendell, writer
- February 27 - Joanne Woodward, actress
- March 3 - Heiner Gei�ler, politician
- March 6 - Lorin Maazel, opera conductor
- March 7 - Antony Armstrong-Jones, Lord Snowdon
- March 19 - Ornette Coleman, musician
- March 22 - Stephen Sondheim, composer and lyricist
- March 22 - Pat Robertson, televangelist
- March 24 - Steve McQueen, film director and producer (d. 1980)
- March 26 - Sandra Day O'Connor, US Supreme Court Justice.
- March 27 - David Janssen, actor (d. 1980)
- March 30 - John Astin, actor
- March 30 - Rolf Harris, entertainer
- April 3 - Helmut Kohl, German chancellor
- April 15 - [[Vigd�s Finnbogad�ttir]], President of Iceland
- April 21 - Silvana Mangano, actress (d. 1989)
- April 22 - Georges Schoeters, Belgian born FLQ activist
- April 25 - Paul Mazursky, director, writer
- May 10 - Pat Summerall, American football player, broadcaster
- May 15 - Jasper Johns, painter
- May 19 - Lorraine Hansberry, playwright (d. 1965)
- May 21 - Malcolm Fraser, twenty-second Prime Minister of Australia
- May 22 - Harvey Milk, politician, civil rights activist (d. 1978)
- May 31 - Clint Eastwood, actor, director, producer
- June 12 - Jim Nabors, actor, musician, comedian
- June 22 - Yuri Artyukhin, cosmonaut (d. 1998)
- June 27 - Ross Perot, billionaire and politician
- July 2 - Carlos Menem, former President of Argentina.
- July 4 - George Steinbrenner, owner of the New York Yankees
- July 11 - Harold Bloom, literary critic
- August 1 - Pierre Bourdieu, French sociologist
- August 5 - Neil Armstrong, astronaut, first person to walk on Earth's Moon
- August 12- George Soros, Hungarian-born American businessman
- August 21 - Princess Margaret, Countess of Snowdon, sister of Queen Elizabeth II
- August 25 - Sir Sean Connery, actor
- September 3 - Cherry Wilder, author
- September 7 - Baudouin I of Belgium
- September 25 - Shel Silverstein, author, poet, humorist (d. 1999)
- September 26 - Fritz Wunderlich, tenor (d. 1966)
- September 30 - Ray Charles, singer, musician (d. 2004)
- October 1 - Sir Richard Harris, actor (d. 2002)
- October 5 - Pavel Popovich, cosmonaut
- October 8 - Toru Takemitsu, composer (d. 1996)
- October 10 - Harold Pinter, playwright
- October 11 - Sam Johnson, American politician
- October 28 - Bernie Ecclestone, Formula 1 racing tycoon
- October 30 - Timothy Findley, Canadian author
- November 14 - Edward White, American astronaut (d. 1967)
- November 16 - Chinua Achebe, Nigerian writer
- December 11 - Jean-Louis Trintignant, actor
- December 21 - Adebayo Adedeji, professor
- February 23 - Horst Wessel, Nazi ideologue, composer
- February 27 - Ahmad Shah Qajar , former Persian Shah of the Qajar dynasty
- March 8 - William Howard Taft, President of the United States, Chief Justice of the United States
- March 19 - Arthur James Balfour, Prime Minister of the United Kingdom.
- March 24 - Eugeen Van Mieghem, painter
- April 1 - Empress Zawditu of Ethiopia
- May 13 - Fridtjof Nansen, explorer
- June 5 - Pascin, the "Prince of Montparnasse"
- July 7 - Arthur Conan Doyle, British author and creator of Sherlock Holmes.
- August 15 - Florian Cajori, historian of mathematics.
- August 29 - William Archibald Spooner, British scholar and Anglican priest
- October 26 � Harry Payne Whitney, businessman, horse breeder
- November 4 - Buddy Bolden, jazz musician (b. 1877)
- December 9 - Andrew "Rube" Foster, pioneer of Negro League baseball
- December 9 - Laura Muntz Lyall, Canadian impressionist painter
- Physics - Sir Chandrasekhara Venkata Raman
- Chemistry - Hans Fischer
- Medicine - Karl Landsteiner
- Literature - Sinclair Lewis
- Peace - Archbishop [[Nathan S�derblom|Lars Olof Nathan Söderblom]]
Heads of state in 1930
- Victor Emmanuel III of Italy, King of Italy (1900 - 1946).
- Albert I of Belgium, King of Belgium (1909 - 1934).
- George V of the United Kingdom, King of the United Kingdom, Emperor of India (1910 - 1936).
- Christian X of Denmark, King of Denmark and Iceland (1912 - 1947).
- [[Mikl�s Horthy]], Regent of Hungary (1920 - 1944).
- Mikhail Kalinin, President of the Soviet Union (1922 - 1946).
- [[Mustafa Kemal Atat�rk]], President of Turkey (1923 - 1938).
- Paul von Hindenburg, President of Germany (1925 - 1934).
- Hirohito, (Showa Emperor of Japan) (1926 - 1989).
- Zog of Albania, King of Albania (1928 - 1939).
- Herbert Clark Hoover, President of the United States (1929 - 1933).
- Haile Selassie, Emperor of Ethiopia (1930 - 1936, 1941 - 1974).
- Getulio Vargas, President of Brazil (1930 - 1945, 1950 - 1954).af:1930
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