| 121111 | October 23 | Birth | 1869 – John Heisman, American football player and coach (d. 1936) |
| 121112 | October 23 | Birth | 1870 – Francis Kelley, Canadian-American bishop (d. 1948) |
| 121113 | October 23 | Birth | 1873 – William D. Coolidge, American physicist and engineer (d. 1975) |
| 121114 | October 23 | Birth | 1874 – Charles Kilpatrick, American runner and educator (d. 1921) |
| 121115 | October 23 | Birth | 1875 – Gilbert N. Lewis, American chemist and academic (d. 1946) |
| 121116 | October 23 | Birth | 1876 – Franz Schlegelberger, German judge and politician, Reich Ministry of Justice (d. 1970) |
| 121117 | October 23 | Birth | 1880 – Una O'Connor, Irish-American actress and singer (d. 1959) |
| 121118 | October 23 | Birth | 1885 – Lawren Harris, Canadian painter and educator (d. 1970) |
| 121119 | October 23 | Birth | 1888 – Onésime Gagnon, Canadian scholar and politician, 20th Lieutenant Governor of Quebec (d. 1961) |
| 121120 | October 23 | Birth | 1893 – Jean Acker, American actress (d. 1978) |
| 121121 | October 23 | Birth | 1893 – Gummo Marx, American actor and agent (d. 1977) |
| 121122 | October 23 | Birth | 1894 – Rube Bressler, American baseball player (d. 1966) |
| 121123 | October 23 | Birth | 1894 – Emma Vyssotsky, American astronomer and academic (d. 1975) |
| 121124 | October 23 | Birth | 1896 – André Lévêque, French soldier and engineer (d. 1930) |
| 121125 | October 23 | Birth | 1896 – Lilyan Tashman, American actress (d. 1934) |
| 121126 | October 23 | Birth | 1897 – John Baker, English air marshal (d. 1978) |
| 121127 | October 23 | Birth | 1897 – Marjorie Flack, American author and illustrator (d. 1958) |
| 121128 | October 23 | Birth | 1900 – Douglas Jardine, Indian-English cricketer and lawyer (d. 1958) |
| 121129 | October 23 | Birth | 1904 – Harvey Penick, American golfer and coach (d. 1995) |
| 121130 | October 23 | Birth | 1905 – Felix Bloch, Swiss physicist and academic, Nobel Prize laureate (d. 1983) |
| 121131 | October 23 | Birth | 1905 – Yen Chia-kan, Chinese lawyer and politician, President of the Republic of China (d. 1993) |
| 121132 | October 23 | Birth | 1905 – Gertrude Ederle, American swimmer (d. 2003) |
| 121133 | October 23 | Birth | 1908 – František Douda, Czech shot putter (d. 1990) |
| 121134 | October 23 | Birth | 1908 – Ilya Frank, Russian physicist and academic, Nobel Prize laureate (d. 1990) |
| 121135 | October 23 | Birth | 1909 – Zellig Harris, American linguist and methodologist (d. 1992) |
| 121136 | October 23 | Birth | 1910 – Richard Mortensen, Danish painter and educator (d. 1993) |
| 121137 | October 23 | Birth | 1910 – Hayden Rorke, American actor (d. 1987) |
| 121138 | October 23 | Birth | 1911 – Jack Keller, American hurdler (d. 1978) |
| 121139 | October 23 | Birth | 1918 – Augusta Dabney, American actress (d. 2008) |
| 121140 | October 23 | Birth | 1918 – James Daly, American actor (d. 1978) |