| 70651 | June 20 | Death | 1597 – Willem Barentsz, Dutch cartographer and explorer (b. 1550) |
| 70652 | June 20 | Death | 1605 – Feodor II of Russia (b. 1589) |
| 70653 | June 20 | Death | 1668 – Heinrich Roth, German missionary and scholar (b. 1620) |
| 70654 | June 20 | Death | 1776 – Benjamin Huntsman, English businessman (b. 1704) |
| 70655 | June 20 | Death | 1787 – Carl Friedrich Abel, German viol player and composer (b. 1723) |
| 70656 | June 20 | Death | 1800 – Abraham Gotthelf Kästner, German mathematician and academic (b. 1719) |
| 70657 | June 20 | Death | 1810 – Axel von Fersen the Younger, Swedish general and politician (b. 1755) |
| 70658 | June 20 | Death | 1815 – Guillaume Philibert Duhesme, French general (b. 1766) |
| 70659 | June 20 | Death | 1820 – Manuel Belgrano, Argentinian general, economist, and politician (b. 1770) |
| 70660 | June 20 | Death | 1837 – William IV of the United Kingdom (b. 1765) |
| 70661 | June 20 | Death | 1840 – Pierre Claude François Daunou, French historian and politician (b. 1761) |
| 70662 | June 20 | Death | 1847 – Juan Larrea, Argentinian captain and politician (b. 1782) |
| 70663 | June 20 | Death | 1869 – Hijikata Toshizō, Japanese commander (b. 1835) |
| 70664 | June 20 | Death | 1870 – Jules de Goncourt, French historian and author (b. 1830) |
| 70665 | June 20 | Death | 1872 – Élie Frédéric Forey, French general (b. 1804) |
| 70666 | June 20 | Death | 1875 – Joseph Meek, American police officer and politician (b. 1810) |
| 70667 | June 20 | Death | 1888 – Johannes Zukertort, Polish-English chess player (b. 1842) |
| 70668 | June 20 | Death | 1906 – John Clayton Adams, English painter (b. 1840) |
| 70669 | June 20 | Death | 1909 – Friedrich Martens, Estonian-Russian historian, lawyer, and diplomat (b. 1845) |
| 70670 | June 20 | Death | 1925 – Josef Breuer, Austrian physician and psychologist (b. 1842) |
| 70671 | June 20 | Death | 1929 – Emmanouil Benakis, Greek merchant and politician, 35th Mayor of Athens (b. 1843) |
| 70672 | June 20 | Death | 1938 – Nikolai Janson, Russian politician (b. 1882) |
| 70673 | June 20 | Death | 1945 – Luís Fernando de Orleans y Borbón, Spanish son of Infanta Eulalia of Spain (b. 1888) |
| 70674 | June 20 | Death | 1945 – Bruno Frank, German author, poet, and playwright (b. 1878) |
| 70675 | June 20 | Death | 1947 – Bugsy Siegel, American mobster (b. 1906) |
| 70676 | June 20 | Death | 1952 – Luigi Fagioli, Italian race car driver (b. 1898) |
| 70677 | June 20 | Death | 1958 – Kurt Alder, German chemist and academic, Nobel Prize laureate (b. 1902) |
| 70678 | June 20 | Death | 1963 – Raphaël Salem, Greek-French mathematician and academic (b. 1898) |
| 70679 | June 20 | Death | 1965 – Bernard Baruch, American financier and politician (b. 1870) |
| 70680 | June 20 | Death | 1966 – Georges Lemaître, Belgian priest, physicist, and astronomer (b. 1894) |