| 104261 | September 12 | Birth | 1966 – Vezio Sacratini, Canadian ice hockey player |
| 104262 | September 12 | Birth | 1967 – Louis C.K., American comedian, actor, producer, and screenwriter |
| 104263 | September 12 | Birth | 1967 – Pat Listach, American baseball player, coach, and manager |
| 104264 | September 12 | Birth | 1968 – Larry LaLonde, American guitarist and songwriter (Primus, Possessed, and Blind Illusion) |
| 104265 | September 12 | Birth | 1968 – Nicholas Russell, 6th Earl Russell, English politician (d. 2014) |
| 104266 | September 12 | Birth | 1968 – Richard Snell, South African cricketer and physiotherapist |
| 104267 | September 12 | Birth | 1968 – Paul F. Tompkins, American comedian, actor, producer, and screenwriter |
| 104268 | September 12 | Birth | 1969 – Max Boot, Russian-American historian and author |
| 104269 | September 12 | Birth | 1969 – Ángel Cabrera, Argentinian golfer |
| 104270 | September 12 | Birth | 1969 – James Frey, American author and screenwriter |
| 104271 | September 12 | Birth | 1969 – Shigeki Maruyama, Japanese golfer |
| 104272 | September 12 | Birth | 1970 – Josh Hopkins, American actor and singer |
| 104273 | September 12 | Birth | 1970 – Nathan Larson, American singer-songwriter and guitarist (Shudder To Think, Hot One, and A Camp) |
| 104274 | September 12 | Birth | 1971 – Younes El Aynaoui, Moroccan tennis player |
| 104275 | September 12 | Birth | 1971 – Ahn Jae-wook, South Korean actor and singer |
| 104276 | September 12 | Birth | 1972 – Gideon Emery, English-American actor, producer, and screenwriter |
| 104277 | September 12 | Birth | 1972 – Paul Green, Australian rugby league player and coach |
| 104278 | September 12 | Birth | 1972 – Sidney Souza, Brazilian footballer |
| 104279 | September 12 | Birth | 1973 – Said Ali al-Shihri, Saudi Arabian terrorist (d. 2013) |
| 104280 | September 12 | Birth | 1973 – Darren Campbell, English sprinter |
| 104251 | September 12 | Birth | 1962 – Amy Yasbeck, American actress |
| 104252 | September 12 | Birth | 1963 – Paul Bellini, Canadian actor and screenwriter |
| 104253 | September 12 | Birth | 1964 – Simon Bowthorpe, English businessman |
| 104254 | September 12 | Birth | 1964 – Greg Gutfeld, American journalist and author |
| 104255 | September 12 | Birth | 1964 – Dieter Hecking, German footballer and manager |
| 104256 | September 12 | Birth | 1965 – Einstein Kristiansen, Norwegian animator and producer |
| 104257 | September 12 | Birth | 1965 – Vernon Maxwell, American basketball player |
| 104258 | September 12 | Birth | 1965 – Ahmet Mümtaz Taylan, Turkish actor and director |
| 104259 | September 12 | Birth | 1966 – Darren E. Burrows, American actor and director |
| 104260 | September 12 | Birth | 1966 – Ben Folds, American singer-songwriter, guitarist, and producer (Ben Folds Five, The Bens, Fear of Pop, and 8in8) |