| 143281 | December 20 | Birth | 1983 – Lucy Pinder, English model and actress |
| 143282 | December 20 | Birth | 1983 – Darren Sammy, Saint Lucian cricketer |
| 143283 | December 20 | Birth | 1983 – Lara Stone, Dutch model |
| 143284 | December 20 | Birth | 1983 – Adrián Varela, Mexican singer |
| 143285 | December 20 | Birth | 1984 – Nikolaos Karabelas, Greek footballer |
| 143286 | December 20 | Birth | 1984 – Bobby Morley, Australian actor and singer |
| 143287 | December 20 | Birth | 1984 – David Tavaré, Spanish singer and DJ |
| 143288 | December 20 | Birth | 1985 – Jillian Grace, American model |
| 143289 | December 20 | Birth | 1985 – Gilbert Kirwa, Kenyan runner |
| 143290 | December 20 | Birth | 1986 – Benjamin Brierley, English-German rugby player |
| 143291 | December 20 | Birth | 1986 – Anoop Desai, American singer-songwriter |
| 143292 | December 20 | Birth | 1987 – Yutaka Otsuka, Japanese baseball player |
| 143293 | December 20 | Birth | 1987 – Tariel Zintiridis, Greek martial artist |
| 143294 | December 20 | Birth | 1988 – Andrés Bottiglieri, Italian–Argentinian footballer |
| 143295 | December 20 | Birth | 1989 – Allan Hyde, Danish actor, singer, and screenwriter |
| 143296 | December 20 | Birth | 1990 – JoJo, American singer-songwriter and actress |
| 143297 | December 20 | Birth | 1990 – Filipp Breytveyt, Russian footballer |
| 143298 | December 20 | Birth | 1991 – Hunter Gomez, American actor and producer |
| 143299 | December 20 | Birth | 1991 – Fabian Schär, Swiss footballer, FC Basel |
| 143300 | December 20 | Birth | 1992 – Ksenia Makarova, Russian-American figure skater |
| 143301 | December 20 | Birth | 1994 – Jacko Gill, New Zealand shot putter |
| 143302 | December 20 | Birth | 1994 – Nazriya Nazim, Indian actress |
| 143303 | December 20 | Birth | 1998 – Ivett Tóth, Hungarian figure skater |
| 143304 | December 20 | Death | 217 – Pope Zephyrinus |
| 143305 | December 20 | Death | 860 – Æthelbald of Wessex (b. 834) |
| 143306 | December 20 | Death | 1295 – Margaret of Provence (b. 1221) |
| 143307 | December 20 | Death | 1355 – Stephen Uroš IV Dušan of Serbia (b. 1308) |
| 143308 | December 20 | Death | 1539 – Johannes Lupi, Flemish composer (b. 1506) |
| 143309 | December 20 | Death | 1590 – Ambroise Paré, French physician and surgeon (b. 1510) |
| 143310 | December 20 | Death | 1722 – Kangxi Emperor of China (b. 1654) |