| 139231 | December 9 | Birth | 2000 – Diāna Ņikitina, Latvian figure skater |
| 139232 | December 9 | Birth | 2002 – Timothy Chan, Filipino-Chinese actor |
| 139233 | December 9 | Death | 638 – Sergius I of Constantinople |
| 139234 | December 9 | Death | 748 – Nasr ibn Sayyar, Umayyad general and politician (b. 663) |
| 139235 | December 9 | Death | 1165 – Malcolm IV of Scotland (b. 1141) |
| 139236 | December 9 | Death | 1437 – Sigismund, Holy Roman Emperor (b. 1368) |
| 139237 | December 9 | Death | 1544 – Teofilo Folengo, Italian poet (b. 1491) |
| 139238 | December 9 | Death | 1565 – Pope Pius IV (b. 1499) |
| 139239 | December 9 | Death | 1603 – William Watson, English priest (b. 1559) |
| 139240 | December 9 | Death | 1625 – Ubbo Emmius, Dutch historian and geographer (b. 1547) |
| 139241 | December 9 | Death | 1636 – Fabian Birkowski, Polish preacher and author (b. 1566) |
| 139242 | December 9 | Death | 1641 – Anthony van Dyck, Belgian-English painter and illustrator (b. 1599) |
| 139243 | December 9 | Death | 1669 – Pope Clement IX (b. 1600) |
| 139244 | December 9 | Death | 1674 – Edward Hyde, 1st Earl of Clarendon, English historian and politician, Chancellor of the Exchequer (b. 1609) |
| 139245 | December 9 | Death | 1706 – Peter II of Portugal (b. 1648) |
| 139246 | December 9 | Death | 1718 – Vincenzo Coronelli, Italian monk and cartographer (b. 1650) |
| 139247 | December 9 | Death | 1793 – Yolande de Polastron, French-Austrian educator (b. 1749) |
| 139248 | December 9 | Death | 1798 – Johann Reinhold Forster, German pastor, botanist, and ornithologist (b. 1729) |
| 139249 | December 9 | Death | 1830 – Heinrich Christian Friedrich Schumacher, Danish surgeon, botanist, and academic (b. 1757) |
| 139250 | December 9 | Death | 1854 – Almeida Garrett, Portuguese journalist and author (b. 1799) |
| 139251 | December 9 | Death | 1858 – Robert Baldwin, Canadian lawyer and politician, 3rd Premier of Canada West (b. 1804) |
| 139252 | December 9 | Death | 1887 – Mahmadu Lamine, Senegalese religious leader |
| 139253 | December 9 | Death | 1906 – Ferdinand Brunetière, French author and critic (b. 1849) |
| 139254 | December 9 | Death | 1916 – Natsume Sōseki, Japanese author and poet (b. 1867) |
| 139255 | December 9 | Death | 1924 – Bernard Zweers, Dutch composer and educator (b. 1854) |
| 139256 | December 9 | Death | 1930 – Rube Foster, American baseball player and manager (b. 1879) |
| 139257 | December 9 | Death | 1932 – Karl Blossfeldt, German photographer (b. 1865) |
| 139258 | December 9 | Death | 1932 – Roquia Sakhawat Hussain, Bangladeshi social worker and author (b. 1880) |
| 139259 | December 9 | Death | 1935 – Walter Liggett, American journalist (b. 1886) |
| 139260 | December 9 | Death | 1937 – Gustaf Dalén, Swedish physicist and engineer, Nobel Prize laureate (b. 1869) |