| 139171 | December 9 | Birth | 1969 – Raphaël Rouquier, French mathematician and academic |
| 139172 | December 9 | Birth | 1969 – Allison Smith, American actress and singer |
| 139173 | December 9 | Birth | 1969 – Sebastian Spence, Canadian actor |
| 139174 | December 9 | Birth | 1970 – Kara DioGuardi, American singer-songwriter and producer (Platinum Weird) |
| 139175 | December 9 | Birth | 1970 – Lance Krall, American actor, director, producer, and screenwriter |
| 139176 | December 9 | Birth | 1971 – Geoff Barrow, English drummer, DJ, composer, and producer (Portishead, Beak, and Quakers) |
| 139177 | December 9 | Birth | 1971 – Nick Hysong, American pole vaulter and coach |
| 139178 | December 9 | Birth | 1971 – Petr Nedvěd, Czech-Canadian ice hockey player |
| 139179 | December 9 | Birth | 1971 – Srirasmi Suwadee, Thai wife of Vajiralongkorn |
| 139180 | December 9 | Birth | 1972 – Reiko Aylesworth, American actress |
| 139181 | December 9 | Birth | 1972 – Annalise Braakensiek, Australian model, actress, and TV presenter |
| 139182 | December 9 | Birth | 1972 – Tré Cool, German-American drummer, songwriter, and actor (Green Day, The Lookouts, Foxboro Hot Tubs, and The Network) |
| 139183 | December 9 | Birth | 1972 – Michael Corcoran, American singer-songwriter and producer |
| 139184 | December 9 | Birth | 1972 – Fabrice Santoro, Tahitian-French tennis player and sportscaster |
| 139185 | December 9 | Birth | 1973 – Fabio Artico, Italian footballer |
| 139186 | December 9 | Birth | 1973 – Rahat Fateh Ali Khan, Pakistani singer |
| 139187 | December 9 | Birth | 1973 – Vénuste Niyongabo, Burundian runner |
| 139188 | December 9 | Birth | 1973 – Bárbara Padilla, Mexican-American soprano |
| 139189 | December 9 | Birth | 1974 – Canibus, Jamaican-American rapper and actor (The Hrsmn) |
| 139190 | December 9 | Birth | 1974 – Aloísio da Silva Filho, Brazilian footballer |
| 139191 | December 9 | Birth | 1974 – Wendy Dillinger, American soccer player, coach, and manager |
| 139192 | December 9 | Birth | 1976 – Chris Booker, American baseball player |
| 139193 | December 9 | Birth | 1976 – Bae Soo-bin, South Korean actor |
| 139194 | December 9 | Birth | 1977 – Shayne Graham, American football player |
| 139195 | December 9 | Birth | 1977 – Imogen Heap, English singer-songwriter and keyboard player (Frou Frou and Urban Species) |
| 139196 | December 9 | Birth | 1978 – Gastón Gaudio, Argentinian tennis player |
| 139197 | December 9 | Birth | 1978 – Jesse Metcalfe, American actor |
| 139198 | December 9 | Birth | 1979 – Chen Hao, Chinese actress and singer |
| 139199 | December 9 | Birth | 1979 – Olivia Lufkin, Japanese-American singer-songwriter (D&D) |
| 139200 | December 9 | Birth | 1979 – Stephen McPhail, English-Irish footballer |