Portal:History of science/Selected anniversaries/March 19
- 1865 - Birth of William Morton Wheeler, American entomologist, myrmecologist, pioneer in ethology (d. 1937)
- 1871 - Death of Wilhelm Karl Ritter von Haidinger, Austrian mineralogist (b. 1795)
- 1883 - Birth of Walter Haworth, British chemist, Nobel laureate (d. 1950)
- 1897 - Death of Antoine Thomson d'Abbadie, French geographer (b. 1810)
- 1900 - Birth of Frédéric Joliot, French physicist, Nobel laureate (d. 1958)
- 1914 - Birth of Leonidas Alaoglu, Greek-Canadian mathematician (d. 1981)
- 1914 - Death of Giuseppe Mercalli, Italian volcanologist (b. 1850)
- 1942 - Death of Clinton Hart Merriam, American zoologist (b. 1855)
- 1943 - Birth of Mario J. Molina, Mexican chemist, Nobel laureate
- 1950 - Death of Walter Haworth, British chemist, Nobel laureate (b. 1883)
- 1987 - Death of Louis, 7th duc de Broglie, French physicist, Nobel laureate (b. 1892)
- 2008 - GRB 080319B: A cosmic burst that is the farthest object visible to the naked eye was briefly observed on this day