| 138991 | December 9 | Birth | 1751 – Maria Luisa of Parma (d. 1819) |
| 138992 | December 9 | Birth | 1752 – Antoine Étienne de Tousard, French general and military engineer (d. 1813) |
| 138993 | December 9 | Birth | 1787 – John Dobson, English architect, designed Eldon Square and Lilburn Tower (d. 1865) |
| 138994 | December 9 | Birth | 1806 – Jean-Olivier Chénier, Canadian physician (d. 1838) |
| 138995 | December 9 | Birth | 1813 – Thomas Andrews, Irish chemist and physicist (d. 1885) |
| 138996 | December 9 | Birth | 1837 – Émile Waldteufel, French pianist, composer, and conductor (d. 1915) |
| 138997 | December 9 | Birth | 1842 – Peter Kropotkin, Russian zoologist, economist, geographer, and philosopher (d. 1921) |
| 138998 | December 9 | Birth | 1845 – Joel Chandler Harris, American journalist and author (d. 1908) |
| 138999 | December 9 | Birth | 1847 – George Grossmith, English actor and singer (d. 1912) |
| 139000 | December 9 | Birth | 1850 – Emma Abbott, American soprano and actress (d. 1891) |
| 139001 | December 9 | Birth | 1861 – Hélène Smith, French psychic and occultist (d. 1929) |
| 139002 | December 9 | Birth | 1867 – Gregorios Xenopoulos, Greek journalist and author (d. 1951) |
| 139003 | December 9 | Birth | 1868 – Fritz Haber, Polish-German chemist and academic, Nobel Prize laureate (d. 1934) |
| 139004 | December 9 | Birth | 1870 – Ida S. Scudder, Indian physician and missionary (d. 1960) |
| 139005 | December 9 | Birth | 1871 – Joe Kelley, American baseball player and manager (d. 1943) |
| 139006 | December 9 | Birth | 1873 – George Blewett, Canadian philosopher, author, and academic (d. 1912) |
| 139007 | December 9 | Birth | 1875 – Harry Miller, American race car designer (d. 1943) |
| 139008 | December 9 | Birth | 1876 – Berton Churchill, Canadian-American actor and singer (d. 1940) |
| 139009 | December 9 | Birth | 1876 – Pauline Whittier, American golfer (d. 1946) |
| 139010 | December 9 | Birth | 1877 – Mart Kuusik, Russian-Estonian rower (d. 1964) |
| 139011 | December 9 | Birth | 1882 – Joaquín Turina, Spanish-French composer, educator, and critic (d. 1949) |
| 139012 | December 9 | Birth | 1883 – Nikolai Luzin, Russian mathematician, theorist, and academic (d. 1950) |
| 139013 | December 9 | Birth | 1883 – Alexander Papagos, Greek general and politician, 152nd Prime Minister of Greece (d. 1955) |
| 139014 | December 9 | Birth | 1883 – Joseph Pilates, German-American fitness expert, developed Pilates (d. 1967) |
| 139015 | December 9 | Birth | 1886 – Clarence Birdseye, American businessman, founded Birds Eye (d. 1956) |
| 139016 | December 9 | Birth | 1887 – Tim Moore, American actor (d. 1958) |
| 139017 | December 9 | Birth | 1889 – Hannes Kolehmainen, Finnish-American runner (d. 1966) |
| 139018 | December 9 | Birth | 1890 – Laura Salverson, Canadian author (d. 1970) |
| 139019 | December 9 | Birth | 1891 – Maksim Bahdanovič, Belarusian poet and critic (d. 1917) |
| 139020 | December 9 | Birth | 1895 – Dolores Ibárruri, Spanish journalist and politician (d. 1989) |