Portal:History of science/Selected anniversaries/June 19
- 1623 - Birth of Blaise Pascal, French mathematician (d. 1662)
- 1771 - Birth of Joseph Gergonne, French mathematician (d. 1859)
- 1820 - Death of Joseph Banks, English naturalist and botanist (b. 1743)
- 1844 - Death of Étienne Geoffroy Saint-Hilaire, French naturalist (b. 1772)
- 1846 - Birth of Antonio Abetti, Italian astronomer (d. 1928)
- 1897 - Birth of Cyril Norman Hinshelwood, English chemist and Nobel laureate (d. 1967)
- 1906 - Birth of Ernst Boris Chain, German-British biochemist and Nobel laureate (d. 1979)
- 1910 - Paul Flory, American chemist and Nobel laureate (d. 1985)
- 1914 - A radiotelegraphic link is established between Germany and the United States and German Emperor Wilhelm II and US President Woodrow Wilson exchange telegrams to mark the event.
- 1934 - The Communications Act of 1934 establishes the U.S. Federal Communications Commission (FCC).
- 1988 - Death of Fernand Seguin, Canadian biologist (b. 1922)