September 9 is the 252nd day of the year (253rd in leap years). There are 113 days remaining.
- 1000 - Battle of Swold
- 1513 - In the Battle of Flodden Field James IV of Scotland was defeated.
- 1543 - Mary Stuart, at nine months old, is officially crowned "Queen of Scots" in the central Scottish town of Stirling.
- 1739 - Stono Rebellion, the largest slave uprising in the British mainland colonies prior to the American Revolution, erupted near Charleston
- 1776 - The Continental Congress officially names their new country the United States.
- 1839 - John Herschel takes the first glass plate photograph.
- 1850 - California is admitted as the thirty-first U.S. state.
- 1850 - The Compromise of 1850 strips Texas of a third of its claimed territory (now parts of Colorado, Kansas, New Mexico, Oklahoma, and Wyoming) in return for the federal government assuming $10 million of Texas's pre-annexation debt.
- 1863 - American Civil War: The Union Army enters Chattanooga, Tennessee.
- 1867 - Luxembourg gains its independence.
- 1886 - The Berne Convention is finalized.
- 1914 - World War I: The creation of the Canadian Automobile Machine Gun Brigade, the first fully mechanized unit in the British Army.
- 1926 - The National Broadcasting Company formed.
- 1942 - World War II: A Japanese floatplane drops an incendiary bomb on Oregon.
- 1943 - World War II: The Allies land at Salerno and Taranto, Italy.
- 1944 - World War II: Bulgaria is liberated by Russia.
- 1945 - "First actual case of (a computer) bug being found" - a moth lodged in a relay of a Mark II computer at Harvard.
- 1948 - The Democratic People's Republic of Korea is created.
- 1954 - Marilyn Bell swam for 20 hours and 57 minutes under grueling conditions to become the first person to swim across Lake Ontario
- 1956 - Elvis Presley appears on The Ed Sullivan Show for the first time.
- 1965 - The United States Department of Housing and Urban Development is established.
- 1966 - The National Traffic and Motor Vehicle Safety Act signed into law by U.S. President Lyndon Johnson.
- 1971 - Attica Prison riots
- 1983 - Aaron Pryor beats Alexis Arguello by knockout in round ten of a rematch of their 1982 controversial fight, dubbed "The Battle of The Champions".
- 2001, 01:46:40 UTC - the Unix billennium.
- 2001 - Ahmed Shah Massoud, leader of the Northern Alliance, was assassinated in Afghanistan.
- 2004 - A bomb explodes outside the Australian embassy in Jakarta, killing several people.
- 2004 - Serbian Prime Minister Vojislav Kostunica reverses a decision by Minister of Education and Sport Ljiljana Colic to require the teaching of both creationism and evolution in schools, and announces that Colic will be replaced.
- 1585 - Cardinal Richelieu, French statesman. (d. 1642)
- 1737 - Luigi Galvani, Italian physician and physicist (d. 1798)
- 1754 - William Bligh, British naval officer (d. 1817)
- 1755 - Benjamin Bourne, politician (d. 1808)
- 1824 - Anton Bruckner, Austrian musician (d. 1896)
- 1828 - Leo Tolstoy, Russian novelist (Anna Karenina, War and Peace) (d. 1910)
- 1849 - Lucy Rider Meyer, physician, social worker, educator, Methodist deaconess
- 1855 - Anthony Francis Lucas Croatian-American oil exploration pioneer (d. 1921)
- 1868 - Mary Hunter Austin, writer (d. 1934)
- 1873 - Max Reinhardt, German film director and actor (d. 1943)
- 1878 - Adelaide Crapsey, poet
- 1887 - Alf Landon, American politician (d. 1987)
- 1890 - Colonel Harland Sanders, fast food entrepreneur (d. 1980)
- 1894 - Arthur Freed, songwriter and film producer (d. 1973)
- 1898 - Frankie Frisch, baseball player
- 1899 - Waite Hoyt, Baseball Hall of Famer (d. 1984)
- 1899 - Billy Rose, composer (d. 1966)
- 1903 - Phyllis Whitney, mystery writer
- 1905 - Joseph Levine, film producer
- 1911 - John Gorton, nineteenth Prime Minister of Australia (d. 2002)
- 1918 - Jimmy Snyder, bookmaker, sports commentator
- 1923 - Daniel Carleton Gajdusek, Virologist, Nobel Prize in Physiology or Medicine laureate in 1976
- 1924 - Jane Greer, actress
- 1925 - Cliff Robertson, Academy Award-winning actor.
- 1928 - Julian "Cannonball" Adderley, jazz musician (d. 1975)
- 1935 - Chaim Topol, Israeli actor
- 1939 - Carlos Ortiz, Puerto Rican world champion boxer
- 1941 - Peter Bonetti, British soccer goalkeeper
- 1941 - Otis Redding, singer and songwriter (d. 1967)
- 1941 - Dennis Ritchie, computer scientist
- 1946 - Billy Preston, musician
- 1949 - Joe Theismann, American football star, sports commentator.
- 1951 - Tom Wopat, actor and singer.
- 1951 - Michael Keaton, actor
- 1952 - David A. Stewart, musician, Eurythmics
- 1954 - Jeffrey Combs, American actor
- 1960 - Hugh Grant, British actor (Nine Months, Notting Hill, Bridget Jones's Diary)
- 1966 - Georg Hackl, German luger
- 1966 - Adam Sandler American actor and comedian (Saturday Night Live, Happy Gilmore, 50 First Dates)
- 1970 - Macy Gray, singer
- 701 - Pope Sergius I
- 1000 - Olaf I of Norway
- 1087 - king William I of England
- 1488 - Francis II, Duke of Brittany, from a fall from a horse
- 1513 - king James IV of Scotland
- 1901 - Henri de Toulouse-Lautrec, French painter
- 1909 - Edward Henry Harriman, railroad entrepreneur
- 1915 - Albert Spalding, American baseball player and sporting goods manufacturer
- 1976 - Mao Zedong, Chinese Communist leader
- 1978 - Jack Warner, Hollywood studio founder
- 1980 - John Howard Griffin, writer (b. 1920)
- 1982 - Princess Grace of Monaco, American actress
- 1990 - Samuel Doe, Liberian president
- 1990 - Doc Cramer, Major League Baseball center fielder (b. 1905)
- 1993 - Helen O'Connell, Big-band singer
- 1997 - Burgess Meredith, actor
- 1999 - Jim "Catfish" Hunter, Baseball Hall of Famer
- 2001 - Ahmed Shah Massoud, Afghan military leader
- 2003 - Edward Teller, American physicist, "Father of the H-Bomb"
Holidays and observances
September 8 - September 10 - August 9 - October 9 - listing of all days
ca:9 de setembre
es:9 de septiembre
eo:9-a de septembro
oc:9 de setembre
pt:9 de Setembro