September 14 is the 257th day of the year (258th in leap years). There are 108 days remaining.
- 1760: Luigi Cherubini, Italian composer
- 1769: Alexander von Humboldt, German naturalist and explorer
- 1849: Ivan Pavlov, Russian scientist
- 1933: Zoe Caldwell, US actress
- 1933: Harve Presnell, US actor
- 1934: Kate Millett, US feminist writer
- 1936: Walter Koenig, US actor
- 1947: Sam Neill, US actor
- 1959: Mary Frances
- 1963: Mary Ann Fischer gave birth to America's first surviving quintuplets
- 1971: Kimberly Williams, US actress
- 1638: John Harvard, clergyman who left his library and estate to a local college, who became Harvard College
- 1852: The Duke of Wellington (British general and Prime Minister)
- 1899: Henry Bliss (first automobile fatality, New York City)
- 1901: US President William McKinley (assassinated)
- 1927: Isadora Duncan, strangled by her scarf entangled in a wheel of her car.
- 1960: Sir Arthur Percy Morris Fleming, radar pioneer
- 1982: Bashir Gemayel, President of The Lebanon (bombing)
- 1982: Princess Grace of Monaco, formerly actress Grace Kelly (car accident)
- 1901: Theodore Roosevelt becomes president of the United States.
- 1959: The Soviet probe Luna 2 crashes onto the Moon; it is the first man-made object to reach it.
- 1960: The Organization of the Petroleum Exporting Countries (OPEC) was founded. The core members were Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela.
- 1984: Joe Kittinger became the first person to fly a balloon solo across the Atlantic Ocean.