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| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| 1909 by topic |
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| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
1909 (MCMIX) was a common year starting on Friday in the Gregorian calendar and a common year starting on Thursday in the Julian calendar.
Events
- March 31 – Construction of the RMS Titanic is started
- April 6 – Robert Peary arrived in the north pole.
- April – The Adana massacre takes place in the Ottoman city of Adana
- June 29 – Alfred Deakin becomes Prime Minister of Australia
- The first model of the Model T is sold
- The pH scale is developed.
- Emil Theodor Kocher, Swiss doctor, won the 1909 Nobel Prize in Physiology or Medicine
Births
- January 13 – Danny Barker, American musician (d. 1994)
- February 9 – Carmen Miranda, Brazilian singer and actress (d. 1955)
- March 20 – Juliana of the Netherlands (d. 2004)
- May 27
- Dolores Hope, American singer (d. 2011)
- Juan Vicente Pérez, Supercentenarian Venezuelan man fourth-oldest verified man ever (d. 2024)
- June 6 – Isaiah Berlin, Latvian philosopher and educator (d. 1997)
- June 10 – Errol Flynn, American actor (d. 1959)
- August 10 – Leo Fender, American guitar maker (d. 1991)
- August 21 – Ethel Caterham, British supercentenarian
- August 26 – Sylvère Maes, Belgian cyclist (d. 1966)
- September 21 – Kwame Nkrumah, President of Ghana (d. 1972)
Deaths
- February 17 – Geronimo, Native American leader (b. 1829)
- December 17 – Léopold II of Belgium, King of Belgium (b. 1835)
- January 12 – Hermann Minkowski, German mathematician (b. 1864)