Decades: 1880s - 1890s - 1900s - 1910s - 1920s - 1930s - 1940s - 1950s - 1960s - 1970s - 1980s
Years: 1925 - 1926 - 1927 - 1928 - 1929 - 1930 - 1931 - 1932 - 1933 - 1934 - 1935
Events:
- January 6 - The first diesel-engine automobile trip is completed (Indianapolis, Indiana, to New York City).
- 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 12 - Mahatma Gandhi leads a 200-mile march protest march to the sea in defiance of British opposition, to protest the British monopoly on salt
- March 28 - Constantinople and Angora change their names to Istanbul and Ankara
- 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 22 - The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
- August 7 - Richard Bedford Bennett becomes Canada's eleventh prime minister.
- Neutron discovered by W. Bothe and H. Becker
- 1930 in film
- 1930 in literature
- 1930 in music
- 1930 in sports
- Uruguay wins Football World Cup on home ground
- British Empire Games held in Hamilton, Canada
- 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 tallys, 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 - Glenn Yarborough, singer, songwriter
- January 13 - Frances Sternhagen, actress
- January 20 - Buzz Aldrin, astronaut
- 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 Geißler, 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 (+ 1980)
- March 26 - Sandra Day O'Connor, US Supreme Court Justice.
- March 27 - David Janssen, actor (+ 1980)
- March 30 - John Astin, actor
- April 3 - Helmut Kohl, German chancellor
- April 25 - Paul Mazursky, director, writer
- May 31 - Clint Eastwood (actor, director, producer)
- August 1 - Pierre Bourdieu, French sociologist
- August 5 - Neil Armstrong, astronaut, first person to walk on Earth's Moon
- August 25 - Sir Sean Connery, actor
- September 7 - Baudouin I of Belgium
- October 1 - Sir Richard Harris, actor
- October 5 - Pavel Popovich, cosmonaut
- October 10 - Harold Pinter, playwright
- October 30 - Timothy Findley, canadian author
- November 14 - Edward White, Americanastronaut
- December 11 - Jean-Louis Trintignant, actor
- February 23 - Horst Wessel, Nazi ideologue, composer
- March 8 - William Howard Taft, President of the United States, Chief Justice of the United States
- April 1 - Empress Zawditu of Ethiopia
- June 5 - Pascin, the "Prince of Montparnasse"
- July 7 - Arthur Conan Doyle, British author and creator of Sherlock Holmes.
- December 9 - Andrew "Rube" Foster, pioneer of Negro League baseball