1906 1907 1908 - 1909 - 1910 1911 1912
1870s 1880s 1890s - 1900s - 1910s 1920s 1930s
Events of 1909
- January – The Old Age Pensions Act 1908 comes into force in Britain.
- January 1 – Drilling begins on the Lakeview Gusher.
- January 5 – Colombia recognizes the independence of Panama.
- January 16 – Ernest Shackleton's expedition claims to have found the magnetic South Pole, but the location recorded for it may be incorrect. 
- January 27 – The Young Left is founded in Norway.
- January 28 – United States troops leave Cuba after being there since the Spanish-American War.
- February 12 – The National Association for the Advancement of Colored People (NAACP) is founded, commemorating the 100th anniversary of President Abraham Lincoln's birth.
- February 20- The Futurist Manifesto, written by Filippo Marinetti, is published in the Paris newspaper Le Figaro.
- February 23 – The Silver Dart makes the first powered flight in Canada.
- February 24 – The Hudson Motor Car Company is founded.
- March 4 – William Howard Taft succeeds Theodore Roosevelt as the 27th President of the United States.
- March 10 – The Anglo-Siamese Treaty of 1909 is signed in Bangkok.
- March 18 – Einar Dessau uses a short-wave radio transmitter, becoming the first radio broadcaster.
- March 23 – Theodore Roosevelt leaves New York for a post-presidency safari in Africa. The trip is sponsored by the Smithsonian Institution and National Geographic Society.
- March 31
- April 4 – The Sport Club Internacional is founded in Porto Alegre, Rio Grande do Sul, Brazil.
- April 6 – Robert Peary, Matthew Henson, and four Eskimo explorers come within a few miles of the North Pole.
- April 11 – The city of Tel Aviv (then known as Ahuzat Bayit) is founded.
- April 18 – Joan of Arc is beatified in Rome.
- April 19 – The Anglo-Persian Oil Company, now BP, is incorporated.
- April 27 – Sultan of the Ottoman Empire Abdul Hamid II is overthrown and succeeded by his brother, Mehmed V. He is sent to the Ottoman port city of Thessaloniki (Selanik) the next day.
- June 1 – The Alaska-Yukon-Pacific Exposition opens in Seattle.
- June 2 – Alfred Deakin becomes Prime Minister of Australia for the third time.
- June 9 – Alice Huyler Ramsey, a 22-year-old housewife and mother from Hackensack, New Jersey, becomes the first woman to drive across the United States. With 3 female companions, none of whom could drive a car, for 59 days she drives a Maxwell automobile 3,800 miles, from Manhattan, New York to San Francisco, California.
- June 15 – Representatives from England, Australia and South Africa meet at Lord's and form the Imperial Cricket Conference.
- June 22 – Construction begins on the Cape Cod Canal, which would separate Cape Cod from mainland Massachusetts, United States.
- June 26 – The Science Museum in London comes into existence as an independent entity.
- July 13 – Gold is discovered near Cochrane, Ontario.
- July 16 – A revolution forces Mohammad Ali Shah, Persian Shah of the Qajar dynasty to abdicate in favor of his son Ahmad Shah Qajar. He proceeds to leave Persia for Imperial Russia, reportedly seeking the assistance of Nicholas II of Russia in regaining the throne.
- July 25 – Louis Bleriot is the first man to fly across the English Channel (thus a large open body of water) in a heavier-than-air craft.
- July 25 – August 2 – The city of Barcelona experiences a worker's uprising known as the Tragic Week.
- August 2 – The United States Army Signal Corp Division purchases the world's first military airplane. They buy the Wright Military Flyer from the Wright Brothers.
- August 8 – The Rosicrucian Fellowship is launched at Seattle, Washington.
- August 12 – The first event is held at Indianapolis Motor Speedway.
- August 23 – Welshman Fred ‘Tenby’ Davies beats Irishman Bert Day at Pontypridd to become world champion over the half-mile distance run.
- September 4 – Japan and China sign the Jiandao/Gando Treaty, which gives Imperial Japan a way to receive railroad concessions in Manchuria.
- October – The Trade Boards Act, a form of minimum wage legislation, is passed in the UK.
- October 8
- October 8
- October 13 – An agreement by Germany, Italy and Switzerland gives the Germans and Italians access to the Gotthard Rail Tunnel.
- October 26 – Korean nationalist An Jung-geun assassinates Ito Hirobumi, a former Prime Minister of Japan, in Harbin, China, in protest of the Japanese annexation of Korea.
- November 2 – The Lambda Chi Alpha Fraternity is founded at Boston University.
- November 11 – The U.S. Navy founds a navy base in Pearl Harbor, Hawaii.
- November 13 – Ballinger–Pinchot scandal begins: Collier's Magazine accuses U.S. Secretary of the Interior Richard Ballinger of questionable dealings in Alaskan coal fields.
- November 18 – Two United States warships are sent to Nicaragua after 500 revolutionaries (including 2 Americans) are executed by order of dictator Jose Santos Zelaya.
- December 3 – the Ellan Vannin sinks in Liverpool Bay
- December 4
- December 17 – Leopold II of Belgium dies and is succeeded by his nephew Albert I of Belgium.
- December 31 – The Manhattan Bridge opens.
- January 1 - Barry Goldwater, American politician (d. 1998)
- January 30 - Saul Alinsky, leftist community organizer and political idol to Hillary Clinton and Barack Obama (d. 1972)
- April 4 - John Roy Carlson, anti-fascist author and investigator (d. 1991)
- June 8 - Eldon Lee Edwards, 1950s Ku Klux Klan leader (d. 1960)
- August 21 - Karl Hans Janke, institutionalized German inventor and futurist (d. 1988)