Portal:History of science/Selected anniversaries/September 14
- 1486 - Birth of Heinrich Cornelius Agrippa, German alchemist (d. 1535)
- 1712 - Death of Giovanni Domenico Cassini, Italian-born astronomer (b. 1625)
- 1713 - Birth of Johann Kies, German mathematician (d. 1781)
- 1752 - The British Empire adopts the Gregorian calendar, skipping eleven days (the previous day was September 2)
- 1769 - Birth of Alexander von Humboldt, German naturalist and explorer (d. 1859
- 1837 - Birth of Nikolai Bugaev, Russian mathematician (d. 1903)
- 1849 - Birth of Ivan Pavlov, Russian scientist, recipient of the Nobel Prize in Physiology or Medicine (d. 1936)
- 1879 - Death of Bernhard von Cotta, German geologist (b. 1808)
- 1920 - Birth of Alberto Calderón, Argentine mathematician (d. 1998)