| 139021 | December 9 | Birth | 1895 – Conchita Supervía, Spanish soprano and actress (d. 1936) |
| 139022 | December 9 | Birth | 1897 – Hermione Gingold, English-American actress and singer (d. 1987) |
| 139023 | December 9 | Birth | 1898 – Emmett Kelly, American clown (d. 1979) |
| 139024 | December 9 | Birth | 1899 – Jean de Brunhoff, French author and illustrator (d. 1937) |
| 139025 | December 9 | Birth | 1900 – Albert Weisbord, American activist, founded the Communist League of Struggle (d. 1977) |
| 139026 | December 9 | Birth | 1901 – Carol Dempster, American actress (d. 1991) |
| 139027 | December 9 | Birth | 1901 – Jean Mermoz, French pilot and politician (d. 1936) |
| 139028 | December 9 | Birth | 1901 – Ödön von Horváth, Hungarian-German author and playwright (d. 1938) |
| 139029 | December 9 | Birth | 1902 – Margaret Hamilton, American actress, singer, and educator (d. 1985) |
| 139030 | December 9 | Birth | 1904 – Robert Livingston, American actor and singer (d. 1988) |
| 139031 | December 9 | Birth | 1905 – Dalton Trumbo, American author and screenwriter (d. 1976) |
| 139032 | December 9 | Birth | 1906 – Grace Hopper, American admiral and computer scientist, designed COBOL (d. 1992) |
| 139033 | December 9 | Birth | 1909 – Douglas Fairbanks, Jr., American captain, actor, and producer (d. 2000) |
| 139034 | December 9 | Birth | 1911 – Broderick Crawford, American actor and singer (d. 1986) |
| 139035 | December 9 | Birth | 1911 – Ryūzō Sejima, Japanese colonel and businessman (d. 2007) |
| 139036 | December 9 | Birth | 1912 – Tip O'Neill, American politician, 55th Speaker of the United States House of Representatives (d. 1994) |
| 139037 | December 9 | Birth | 1914 – Max Manus, Norwegian lieutenant (d. 1996) |
| 139038 | December 9 | Birth | 1914 – Frances Reid, American actress (d. 2010) |
| 139039 | December 9 | Birth | 1914 – Ljubica Sokić, Serbian painter and illustrator (d. 2009) |
| 139040 | December 9 | Birth | 1915 – Eloise Jarvis McGraw, American author (d. 2000) |
| 139041 | December 9 | Birth | 1915 – Elisabeth Schwarzkopf, German-Austrian soprano and actress (d. 2006) |
| 139042 | December 9 | Birth | 1916 – Jerome Beatty, Jr., American soldier, journalist, and author (d. 2002) |
| 139043 | December 9 | Birth | 1916 – Kirk Douglas, American actor, singer, and producer |
| 139044 | December 9 | Birth | 1917 – James Jesus Angleton, American CIA agent (d. 1987) |
| 139045 | December 9 | Birth | 1917 – James Rainwater, American physicist and academic, Nobel Prize laureate (d. 1986) |
| 139046 | December 9 | Birth | 1918 – Joyce Redman, Irish-English actress (d. 2012) |
| 139047 | December 9 | Birth | 1919 – V. Dakshinamoorthy, Indian singer-songwriter (d. 2013) |
| 139048 | December 9 | Birth | 1919 – William Lipscomb, American chemist and academic, Nobel Prize laureate (d. 2011) |
| 139049 | December 9 | Birth | 1920 – Carlo Azeglio Ciampi, Italian economist and politician, 10th President of Italy |
| 139050 | December 9 | Birth | 1920 – Bruno Ruffo, Italian motorcycle racer and racing driver (d. 2007) |