Portal:History of science/Selected anniversaries/March 18
- 1602 - Birth of Jacques de Billy, French mathematician (d. 1679)
- 1640 - Birth of Philippe de La Hire, French mathematician and astronomer (d. 1719)
- 1690 - Birth of Christian Goldbach, Prussian mathematician (d. 1764)
- 1781 - Charles Messier rediscovers globular cluster M92 - 'M' stands for Messier Object
- 1871 - Death of Augustus De Morgan, Indian-born British mathematician and logician (b. 1806)
- 1905 - Birth of Thomas Townsend Brown, American scientist (d. 1985)
- 1907 - Birth of John Zachary Young, British biologist (d. 1997)
- 1907 - Death of Marcellin Berthelot, French chemist and politician (b. 1827)
- 1935 - Birth of Ole Barndorff-Nielsen, Danish mathematician
- 1965 - Cosmonaut Alexey Leonov, leaving his spacecraft Voskhod 2 for 12 minutes, becomes the first person to walk in space