| 143311 | December 20 | Death | 1723 – Augustus Quirinus Rivinus, German physician and botanist (b. 1652) |
| 143312 | December 20 | Death | 1740 – Richard Boyle, 2nd Viscount Shannon, English field marshal and politician, Governor of Portsmouth (b. 1675) |
| 143313 | December 20 | Death | 1765 – Louis, Dauphin of France (b. 1729) |
| 143314 | December 20 | Death | 1768 – Carlo Innocenzo Frugoni, Italian poet and academic (b. 1692) |
| 143315 | December 20 | Death | 1783 – Antonio Soler, Spanish priest and composer (b. 1729) |
| 143316 | December 20 | Death | 1812 – Sacagawea, American explorer (b. 1788) |
| 143317 | December 20 | Death | 1820 – John Bell, American farmer (b. 1750) |
| 143318 | December 20 | Death | 1856 – Francesco Bentivegna, Italian activist (b. 1820) |
| 143319 | December 20 | Death | 1862 – Robert Knox, Scottish surgeon and zoologist (b. 1791) |
| 143320 | December 20 | Death | 1880 – Gaspar Tochman, Polish-American colonel and lawyer (b. 1797) |
| 143321 | December 20 | Death | 1893 – George C. Magoun, American businessman (b. 1840) |
| 143322 | December 20 | Death | 1915 – Upendrakishore Ray, Indian painter and composer (b. 1863) |
| 143323 | December 20 | Death | 1916 – Louis de Champsavin, French horse rider (b. 1867) |
| 143324 | December 20 | Death | 1917 – Lucien Petit-Breton, French cyclist (b. 1882) |
| 143325 | December 20 | Death | 1920 – Linton Hope, English sailor and architect (b. 1863) |
| 143326 | December 20 | Death | 1921 – Hans Hartwig von Beseler, German general and politician (b. 1850) |
| 143327 | December 20 | Death | 1927 – Frederick Semple, American golfer and tennis player (b. 1872) |
| 143328 | December 20 | Death | 1929 – Émile Loubet, French lawyer and politician, 8th President of France (b. 1838) |
| 143329 | December 20 | Death | 1935 – Martin O'Meara, Irish-Australian sergeant, Victoria Cross recipient (b. 1882) |
| 143330 | December 20 | Death | 1937 – Erich Ludendorff, German general (b. 1865) |
| 143331 | December 20 | Death | 1938 – Annie Armstrong, American missionary (b. 1850) |
| 143332 | December 20 | Death | 1938 – Matilda Howell, American archer (b. 1859) |
| 143333 | December 20 | Death | 1941 – Igor Severyanin, Russian-Estonian poet and author (b. 1887) |
| 143334 | December 20 | Death | 1950 – Enrico Mizzi, Maltese lawyer and politician, 6th Prime Minister of Malta (b. 1885) |
| 143335 | December 20 | Death | 1954 – James Hilton, English-American author and screenwriter (b. 1900) |
| 143336 | December 20 | Death | 1956 – Ramón Carrillo, Argentinian neurologist and physician (b. 1906) |
| 143337 | December 20 | Death | 1959 – Juhan Simm, Estonian composer and conductor (b. 1885) |
| 143338 | December 20 | Death | 1961 – Moss Hart, American director and playwright (b. 1904) |
| 143339 | December 20 | Death | 1961 – Earle Page, Australian soldier and politician, 11th Prime Minister of Australia (b. 1880) |
| 143340 | December 20 | Death | 1968 – John Steinbeck, American author, Nobel Prize laureate (b. 1902) |