| 31681 | March 21 | Birth | 1978 – Nick "Peanut" Baines, English keyboard player (Kaiser Chiefs) |
| 31682 | March 21 | Birth | 1978 – Sally Barsosio, Kenyan runner |
| 31683 | March 21 | Birth | 1978 – Charmaine Dragun, Australian journalist (d. 2007) |
| 31684 | March 21 | Birth | 1978 – Kevin Federline, American dancer, rapper, and actor |
| 31685 | March 21 | Birth | 1978 – Cristian Guzmán, Dominican baseball player |
| 31686 | March 21 | Birth | 1978 – Joyce Jimenez, American-Filipino actress |
| 31687 | March 21 | Birth | 1978 – Rani Mukerji, Indian actress |
| 31688 | March 21 | Birth | 1978 – Young Noble, American rapper (Outlawz) |
| 31689 | March 21 | Birth | 1980 – Ronaldinho, Brazilian footballer |
| 31690 | March 21 | Birth | 1980 – Marit Bjørgen, Norwegian skier |
| 31691 | March 21 | Birth | 1980 – Lee Jin, South Korean singer and actress (Fin.K.L) |
| 31692 | March 21 | Birth | 1980 – Deryck Whibley, Canadian singer-songwriter, guitarist, and producer (Sum 41) |
| 31693 | March 21 | Birth | 1981 – Germano Borovicz Cardoso Schweger, Brazilian footballer |
| 31694 | March 21 | Birth | 1981 – Sébastien Chavanel, French cyclist |
| 31695 | March 21 | Birth | 1981 – Aysun Kayacı, Turkish model and actress |
| 31696 | March 21 | Birth | 1982 – Maria Elena Camerin, Italian tennis player |
| 31697 | March 21 | Birth | 1982 – Ejegayehu Dibaba, Ethiopian runner |
| 31698 | March 21 | Birth | 1982 – Aaron Hill, American baseball player |
| 31699 | March 21 | Birth | 1982 – Jocie Kwok, Chinese-Singaporean singer |
| 31700 | March 21 | Birth | 1982 – Ermal Mamaqi, Albanian actor, singer, and DJ |
| 31701 | March 21 | Birth | 1982 – Colin Turkington, Northern Irish race car driver |
| 31702 | March 21 | Birth | 1983 – Bonfire, German race horse (d. 2013) |
| 31703 | March 21 | Birth | 1983 – Lucila Pascua, Spanish basketball player |
| 31704 | March 21 | Birth | 1983 – Jean Ondoa, Cameroonian footballer |
| 31705 | March 21 | Birth | 1983 – Sofía Zámolo, Argentinian model and television host |
| 31706 | March 21 | Birth | 1984 – Tiago dos Santos Roberto, Brazilian footballer |
| 31707 | March 21 | Birth | 1984 – Guillermo Daniel Rodríguez, Uruguayan footballer |
| 31708 | March 21 | Birth | 1985 – Ryan Callahan, American ice hockey player |
| 31709 | March 21 | Birth | 1985 – Jésica Cirio, Argentinian model, actress, and dancer |
| 31710 | March 21 | Birth | 1985 – Adrian Peterson, American football player |