| 104101 | September 12 | Birth | 1837 – Louis IV, Grand Duke of Hesse (d. 1892) |
| 104102 | September 12 | Birth | 1852 – H. H. Asquith, English lawyer and politician, Prime Minister of the United Kingdom (d. 1928) |
| 104103 | September 12 | Birth | 1855 – Simon-Napoléon Parent, Canadian lawyer and politician, 12th Premier of Quebec (d. 1920) |
| 104104 | September 12 | Birth | 1856 – Johann Heinrich Beck, American composer and conductor (d. 1924) |
| 104105 | September 12 | Birth | 1857 – Manuel Espinosa Batista, Colombian pharmacist and politician (d. 1919) |
| 104106 | September 12 | Birth | 1862 – Carl Eytel, German-American painter and illustrator (d. 1925) |
| 104107 | September 12 | Birth | 1866 – Freeman Freeman-Thomas, 1st Marquess of Willingdon, English cricketer and politician, 13th Governor General of Canada (d. 1941) |
| 104108 | September 12 | Birth | 1875 – Matsunosuke Onoe, Japanese actor and director (d. 1926) |
| 104109 | September 12 | Birth | 1880 – H. L. Mencken, American journalist and critic (d. 1956) |
| 104110 | September 12 | Birth | 1882 – Ion Agârbiceanu, Romanian journalist, politician, and archbishop (d. 1963) |
| 104111 | September 12 | Birth | 1884 – Martin Klein, Estonian wrestler and coach (d. 1947) |
| 104112 | September 12 | Birth | 1885 – Heinrich Hoffmann, German photographer and art dealer (d. 1957) |
| 104113 | September 12 | Birth | 1888 – Maurice Chevalier, French actor, singer, and dancer (d. 1972) |
| 104114 | September 12 | Birth | 1889 – Ugo Pasquale Mifsud, Maltese politician, 3rd Prime Minister of Malta (d. 1942) |
| 104115 | September 12 | Birth | 1891 – Pedro Albizu Campos, Puerto Rican lawyer and politician (d. 1965) |
| 104116 | September 12 | Birth | 1891 – Arthur Hays Sulzberger, American publisher (d. 1968) |
| 104117 | September 12 | Birth | 1892 – Alfred A. Knopf, Sr., American publisher, founded Alfred A. Knopf Inc. (d. 1984) |
| 104118 | September 12 | Birth | 1894 – Bibhutibhushan Bandyopadhyay, Indian author and educator (d. 1950) |
| 104119 | September 12 | Birth | 1894 – Billy Gilbert, American actor and singer (d. 1971) |
| 104120 | September 12 | Birth | 1894 – Kyuichi Tokuda, Japanese lawyer and politician (d. 1953) |
| 104121 | September 12 | Birth | 1895 – Freymóður Jóhannsson, Icelandic painter and composer (d. 1973) |
| 104122 | September 12 | Birth | 1897 – Grietje Jansen-Anker, Dutch super-centenarian (d. 2009) |
| 104123 | September 12 | Birth | 1897 – Irène Joliot-Curie, French chemist and physicist, Nobel Prize laureate (d. 1956) |
| 104124 | September 12 | Birth | 1897 – Walter B. Gibson, American magician and author (d. 1985) |
| 104125 | September 12 | Birth | 1898 – Salvador Bacarisse, Spanish composer (d. 1963) |
| 104126 | September 12 | Birth | 1898 – Alma Moodie, Australian violinist and educator (d. 1943) |
| 104127 | September 12 | Birth | 1898 – Ben Shahn, Lithuanian-American painter and photographer (d. 1969) |
| 104128 | September 12 | Birth | 1900 – Haskell Curry, American mathematician, logician, and academic (d. 1982) |
| 104129 | September 12 | Birth | 1901 – Ben Blue, Canadian-American actor and singer (d. 1975) |
| 104130 | September 12 | Birth | 1901 – Shmuel Horowitz, Belarusian-Israeli agronomist and academic (d. 1999) |