Portal:History of science/Selected anniversaries/June 25
- 1593 - Death of Michele Mercati, Italian physician and natural historian (b. 1541)
- 1671 - Death of Giovanni Battista Riccioli, Italian astronomer (b. 1598)
- 1678 - Italian mathematician Elena Cornaro Piscopia becomes the first woman awarded a doctorate of philosophy.
- 1814 - Birth of Gabriel Auguste Daubrée, French geologist (d. 1896)
- 1864 - Birth of Walther Nernst, German chemist and Nobel laureate (d. 1941)
- 1866 - Death of Alexander von Nordmann, Finnish zoologist (b. 1803)
- 1868 - Death of Carlo Matteucci, Italian physicist (b. 1811)
- 1894 - Birth of Hermann Oberth, German physicist (d. 1989)
- 1907 - Birth of J. Hans D. Jensen, German physicist and Nobel laureate (d. 1973)
- 1908 - Birth of Willard Van Orman Quine, American philosopher (d. 2000)
- 1911 - Birth of William Howard Stein, American chemist and Nobel laureate (d. 1980)
- 1928 - Birth of Alexei Alexeyevich Abrikosov, Russian physicist, Nobel laureate
- 1935 - Birth of Charles Sheffield, English-American science fiction author and physicist (d. 2002)
- 1974 - Death of Cornelius Lanczos, Hungarian mathematician (b. 1893)
- 1995 - Death of Ernest Walton, Irish physicist and Nobel laureate (b. 1903)
- 1997 - Death of Jacques-Yves Cousteau, French explorer (b. 1910)