| 143101 | December 20 | Birth | 1860 – Dan Leno, English actor (d. 1904) |
| 143102 | December 20 | Birth | 1861 – Ferdinand Bonn, German actor (d. 1933) |
| 143103 | December 20 | Birth | 1861 – Ivana Kobilca, Slovenian painter (d. 1926) |
| 143104 | December 20 | Birth | 1865 – Elsie de Wolfe, American actress and interior decorator (d. 1950) |
| 143105 | December 20 | Birth | 1868 – Harvey Samuel Firestone, American businessman, founded the Firestone Tire and Rubber Company (d. 1938) |
| 143106 | December 20 | Birth | 1869 – Charley Grapewin, American actor and singer (d. 1956) |
| 143107 | December 20 | Birth | 1873 – Kan'ichi Asakawa, Japanese historian, author, and academic (d. 1948) |
| 143108 | December 20 | Birth | 1873 – Mehmet Akif Ersoy, Turkish poet, academic, and politician (d. 1936) |
| 143109 | December 20 | Birth | 1874 – Frederick Steep, Canadian soccer player (d. 1956) |
| 143110 | December 20 | Birth | 1881 – Branch Rickey, American baseball player and manager (d. 1965) |
| 143111 | December 20 | Birth | 1886 – Hazel Hotchkiss Wightman, American tennis player (d. 1974) |
| 143112 | December 20 | Birth | 1888 – Yitzhak Baer, German-Israeli historian and academic (d. 1980) |
| 143113 | December 20 | Birth | 1888 – Fred Merkle, American baseball player and manager (d. 1958) |
| 143114 | December 20 | Birth | 1890 – Yvonne Arnaud, French actress and singer (d. 1958) |
| 143115 | December 20 | Birth | 1890 – Jaroslav Heyrovský, Czech chemist and academic, Nobel Prize laureate (d. 1967) |
| 143116 | December 20 | Birth | 1891 – Erik Almlöf, Swedish triple jumper (d. 1971) |
| 143117 | December 20 | Birth | 1893 – Piero Campelli, Italian footballer (d. 1946) |
| 143118 | December 20 | Birth | 1894 – Robert Menzies, Australian lawyer and politician, 12th Prime Minister of Australia (d. 1978) |
| 143119 | December 20 | Birth | 1898 – Konstantinos Dovas, Greek general and politician, 156th Prime Minister of Greece (d. 1973) |
| 143120 | December 20 | Birth | 1898 – Irene Dunne, American actress and singer (d. 1990) |
| 143121 | December 20 | Birth | 1901 – Robert J. Van de Graaff, American physicist and academic, invented the Van de Graaff generator (d. 1967) |
| 143122 | December 20 | Birth | 1902 – Prince George, Duke of Kent (d. 1942) |
| 143123 | December 20 | Birth | 1902 – Sidney Hook, American philosopher and author (d. 1989) |
| 143124 | December 20 | Birth | 1904 – Spud Davis, American baseball player, coach, and manager (d. 1984) |
| 143125 | December 20 | Birth | 1904 – Yevgenia Ginzburg, Russian author (d. 1977) |
| 143126 | December 20 | Birth | 1905 – Bill O'Reilly, Australian cricketer and sportscaster (d. 1992) |
| 143127 | December 20 | Birth | 1907 – Paul Francis Webster, American soldier and songwriter (d. 1984) |
| 143128 | December 20 | Birth | 1908 – Dennis Morgan, American actor and singer (d. 1994) |
| 143129 | December 20 | Birth | 1909 – Vakkom Majeed, Indian journalist and politician (d. 2000) |
| 143130 | December 20 | Birth | 1911 – Hortense Calisher, American author (d. 2009) |