| 91171 | August 12 | Birth | 1904 – Alexei Nikolaevich, Tsarevich of Russia (d. 1918) |
| 91172 | August 12 | Birth | 1906 – Harry Hopman, Australian tennis player and coach (d. 1985) |
| 91173 | August 12 | Birth | 1906 – Tedd Pierce, American animator, producer, and screenwriter (d. 1972) |
| 91174 | August 12 | Birth | 1907 – Joe Besser, American actor (d. 1988) |
| 91175 | August 12 | Birth | 1907 – Boy Charlton, Australian swimmer (d. 1975) |
| 91176 | August 12 | Birth | 1907 – Benjamin Sheares, Singaporean physician and politician, 2nd President of Singapore (d. 1981) |
| 91177 | August 12 | Birth | 1909 – Bruce Matthews, Canadian general and businessman (d. 1991) |
| 91178 | August 12 | Birth | 1910 – Yusof bin Ishak, Singaporean journalist and politician, 1st President of Singapore (d. 1970) |
| 91179 | August 12 | Birth | 1910 – Jane Wyatt, American actress and singer (d. 2006) |
| 91180 | August 12 | Birth | 1911 – Cantinflas, Mexican actor, screenwriter, and producer (d. 1993) |
| 91181 | August 12 | Birth | 1912 – Samuel Fuller, American actor, director, and screenwriter (d. 1997) |
| 91182 | August 12 | Birth | 1913 – Richard L. Bare, American director, producer, and screenwriter (d. 2015) |
| 91183 | August 12 | Birth | 1914 – Gerd Buchdahl, German-English philosopher and author (d. 2001) |
| 91184 | August 12 | Birth | 1914 – Ruth Lowe, Canadian pianist and songwriter (d. 1981) |
| 91185 | August 12 | Birth | 1915 – Sickan Carlsson, Swedish actress and singer (d. 2011) |
| 91186 | August 12 | Birth | 1915 – Michael Kidd, American dancer and choreographer (d. 2007) |
| 91187 | August 12 | Birth | 1916 – Ioan Dicezare, Romanian general and pilot (d. 2012) |
| 91188 | August 12 | Birth | 1917 – Oliver Crawford, American screenwriter and author (d. 2008) |
| 91189 | August 12 | Birth | 1918 – Sid Bernstein, American record producer (d. 2013) |
| 91190 | August 12 | Birth | 1918 – Guy Gibson, Indian-English commander and pilot, Victoria Cross recipient (d. 1944) |
| 91191 | August 12 | Birth | 1919 – Margaret Burbidge, English-American astrophysicist and academic |
| 91192 | August 12 | Birth | 1919 – Vikram Sarabhai, Indian physicist and academic (d. 1971) |
| 91193 | August 12 | Birth | 1922 – Fulton Mackay, Scottish actor and playwright (d. 1987) |
| 91194 | August 12 | Birth | 1923 – John Holt, Jamaican cricketer (d. 1997) |
| 91195 | August 12 | Birth | 1924 – Derek Shackleton, English cricketer, coach, and umpire (d. 2007) |
| 91196 | August 12 | Birth | 1924 – Muhammad Zia-ul-Haq, Pakistani general and politician, 6th President of Pakistan (d. 1988) |
| 91197 | August 12 | Birth | 1925 – Dale Bumpers, American soldier, lawyer, and politician, 38th Governor of Arkansas |
| 91198 | August 12 | Birth | 1925 – Guillermo Cano Isaza, Colombian journalist (d. 1986) |
| 91199 | August 12 | Birth | 1925 – Donald Justice, American poet and writing teacher (d. 2004) |
| 91200 | August 12 | Birth | 1925 – Norris McWhirter, Scottish publisher and activist co-founded the Guinness World Records (d. 2004) |