Portal:History of science/Selected anniversaries/July 27
- 1667 - Birth of Johann Bernoulli, Swiss mathematician (d. 1748)
- 1733 - Birth of Jeremiah Dixon, English surveyor and astronomer (d. 1779)
- 1759 - Death of Pierre Louis Maupertuis, French mathematician (b. 1698)
- 1833 - Birth of Thomas George Bonney, English geologist (d. 1923)
- 1844 - Death of John Dalton, English physicist and chemist (b. 1776)
- 1848 - Birth of Loránd Eötvös, Hungarian physicist (d. 1919)
- 1881 - Birth of Hans Fischer, German chemist, Nobel laureate (d. 1945)
- 1931 - Death of Auguste-Henri Forel, Swiss entomologist (b. 1848)
- 1999 - Death of Aleksandr Danilovich Aleksandrov, Russian mathematician (b. 1912)