Portal:History of science/Selected anniversaries/April 18
- 1674 - Death of John Graunt, English statistician (b. 1620)
- 1796 - Death of Johan Wilcke, Swedish physicist (b. 1732)
- 1802 - Death of Erasmus Darwin, English physician and botanist (b. 1731)
- 1838 - Birth of Paul Emile Lecoq de Boisbaudran, French scientist (d. 1912)
- 1873 - Death of Justus von Liebig, German chemist (b. 1803)
- 1905 - Birth of George H. Hitchings, American scientist, Nobel laureate (d. 1998)
- 1940 - Birth of Joseph L. Goldstein, American scientist, Nobel laureate
- 1945 - Death of John Ambrose Fleming, English physicist and engineer (b. 1849)
- 1955 - Death of Albert Einstein, Nobel laureate (b. 1879)