Portal:History of science/Selected anniversaries/May 25
- 1555 - Death of Gemma Frisius, Dutch mathematician and cartographer (b. 1508)
- 1632 - Death of Adam Tanner, Austrian mathematician and philosopher (b. 1572)
- 1789 - Death of Anders Dahl, Swedish botanist (b. 1751)
- 1865 - Birth of Pieter Zeeman, Dutch physicist and Nobel Prize laureate (d. 1943)
- 1880 - Birth of Jean Alexandre Barré, French neurologist (d. 1967)
- 1921 - Jack Steinberger, German-Swiss physicist and Nobel Prize laureate
- 1925 - John T. Scopes is indicted for teaching Darwin's theory of evolution.
- 1935 - Death of Frank Watson Dyson, English Astronomer Royal (b. 1868)
- 1953 - At the Nevada Test Site, the United States conducts its first and only nuclear artillery test.
- 1961 - U.S. president John F. Kennedy announces before a special joint session of Congress his goal to initiate a project to put a "man on the moon" before the end of the decade.
- 1966 - Explorer 32 launches.
- 1977 - Star Wars Episode IV: A New Hope opens in theaters.
- 1983 - Star Wars Episode VI: Return of the Jedi opens in theaters.
- 1988 - Death of Ernst Ruska, German physicist and Nobel Prize laureate (b. 1906)