| 143611 | December 21 | Birth | 1971 – Fenton Keogh, Australian chef |
| 143612 | December 21 | Birth | 1971 – Brett Scallions, American singer-songwriter and guitarist (Fuel, Manzarek–Krieger, and Circus Diablo) |
| 143613 | December 21 | Birth | 1971 – Jamie Theakston, English actor and television host |
| 143614 | December 21 | Birth | 1972 – Gloria De Piero, English journalist and politician |
| 143615 | December 21 | Birth | 1972 – LaTroy Hawkins, American baseball player |
| 143616 | December 21 | Birth | 1972 – Dustin Hermanson, American baseball player |
| 143617 | December 21 | Birth | 1972 – Claudia Poll, Nicaraguan-Costa Rican swimmer |
| 143618 | December 21 | Birth | 1972 – Y. S. Jaganmohan Reddy, Indian journalist and politician |
| 143619 | December 21 | Birth | 1972 – Erwin Schrott, Uruguayan opera singer |
| 143620 | December 21 | Birth | 1973 – Irakli Alasania, Georgian colonel and politician, Georgian Minister of Defense |
| 143621 | December 21 | Birth | 1973 – Mike Alstott, American football player |
| 143622 | December 21 | Birth | 1973 – Karmen Stavec, German-Slovenian singer |
| 143623 | December 21 | Birth | 1974 – Karrie Webb, Australian golfer |
| 143624 | December 21 | Birth | 1975 – Paloma Herrera, Argentinian ballerina |
| 143625 | December 21 | Birth | 1976 – Mirela Maniani, Albanian-Greek javelin thrower |
| 143626 | December 21 | Birth | 1976 – Lukas Rossi, Canadian singer-songwriter and guitarist (Rock Star Supernova and Daylight Division) |
| 143627 | December 21 | Birth | 1977 – A. J. Bowen, American actor and producer |
| 143628 | December 21 | Birth | 1977 – Toby Rand, Australian singer-songwriter (Juke Kartel) |
| 143629 | December 21 | Birth | 1978 – Emiliano Brembilla, Italian swimmer |
| 143630 | December 21 | Birth | 1978 – Mike Vitar, American actor |
| 143631 | December 21 | Birth | 1979 – Steve Montador, Canadian ice hockey player (d. 2015) |
| 143632 | December 21 | Birth | 1979 – Tuva Novotny, Swedish actress, singer, and director |
| 143633 | December 21 | Birth | 1979 – Kristjan Sarv, Estonian actor |
| 143634 | December 21 | Birth | 1980 – Michele Di Piedi, Italian footballer |
| 143635 | December 21 | Birth | 1980 – Royce Ring, American baseball player |
| 143636 | December 21 | Birth | 1981 – Frankie Abernathy, American purse designer, cast member on The Real World: San Diego (d. 2007) |
| 143637 | December 21 | Birth | 1981 – Mohammed Jabarah, Kuwaiti terrorist |
| 143638 | December 21 | Birth | 1981 – Sajid Mahmood, English cricketer |
| 143639 | December 21 | Birth | 1981 – Sanita Pušpure, Latvian-Irish rower |
| 143640 | December 21 | Birth | 1981 – Lynda Thomas, Mexican singer-songwriter and producer |