| 31501 | March 21 | Birth | 1901 – Karl Arnold, German businessman and politician, President of the German Bundesrat (d. 1958) |
| 31502 | March 21 | Birth | 1902 – Son House, American singer and guitarist (d. 1988) |
| 31503 | March 21 | Birth | 1902 – Santo Pecora, American trombonist (New Orleans Rhythm Kings) (d. 1984) |
| 31504 | March 21 | Birth | 1904 – Jehane Benoît, Canadian journalist and author (d. 1987) |
| 31505 | March 21 | Birth | 1904 – Forrest Mars, Sr., American candy maker, created M&M's and Mars bar (d. 1999) |
| 31506 | March 21 | Birth | 1904 – Nikos Skalkottas, Greek violinist and composer (d. 1949) |
| 31507 | March 21 | Birth | 1905 – Phyllis McGinley, American author and poet (d. 1978) |
| 31508 | March 21 | Birth | 1906 – John D. Rockefeller III, American philanthropist (d. 1978) |
| 31509 | March 21 | Birth | 1906 – Jim Thompson, American businessman (d. 1967) |
| 31510 | March 21 | Birth | 1910 – Julio Gallo, American businessman, co-founded E & J Gallo Winery (d. 1993) |
| 31511 | March 21 | Birth | 1910 – Muhammad Siddiq Khan, Bangladeshi librarian and educator (d. 1978) |
| 31512 | March 21 | Birth | 1912 – André Laurendeau, Canadian journalist, playwright, and politician (d. 1968) |
| 31513 | March 21 | Birth | 1913 – George Abecassis, English race car driver and pilot (d. 1991) |
| 31514 | March 21 | Birth | 1914 – Paul Tortelier, French cellist and composer (d. 1990) |
| 31515 | March 21 | Birth | 1916 – Bismillah Khan, Indian shehnai player (d. 2006) |
| 31516 | March 21 | Birth | 1916 – Ken Wharton, English race car driver (d. 1957) |
| 31517 | March 21 | Birth | 1917 – Frank Hardy, Australian journalist, author, and playwright (d. 1994) |
| 31518 | March 21 | Birth | 1917 – Yigael Yadin, Israeli archeologist, general, and politician, Deputy Prime Minister of Israel (d. 1984) |
| 31519 | March 21 | Birth | 1918 – Patrick Lucey, American captain and politician, 38th Governor of Wisconsin (d. 2014) |
| 31520 | March 21 | Birth | 1918 – Charles Thompson, American pianist and composer |
| 31521 | March 21 | Birth | 1919 – Douglas Warren, Australian bishop (d. 2013) |
| 31522 | March 21 | Birth | 1920 – Manolis Chiotis, Greek singer-songwriter and bouzouki player (d. 1970) |
| 31523 | March 21 | Birth | 1920 – Georg Ots, Estonian actor and singer (d. 1975) |
| 31524 | March 21 | Birth | 1921 – Arthur Grumiaux, Belgian violinist and pianist (d. 1986) |
| 31525 | March 21 | Birth | 1921 – Antony Hopkins, English pianist, composer, and conductor (d. 2014) |
| 31526 | March 21 | Birth | 1921 – Logan Ramsey, American actor (d. 2000) |
| 31527 | March 21 | Birth | 1921 – Joe Sutter, American soldier and engineer |
| 31528 | March 21 | Birth | 1922 – Russ Meyer, American director, producer, and screenwriter (d. 2004) |
| 31529 | March 21 | Birth | 1923 – Philip Abbott, American actor and director (d. 1998) |
| 31530 | March 21 | Birth | 1923 – Louis-Edmond Hamelin, Canadian geographer, author, and academic |