| 31471 | March 21 | Birth | 1801 – Maria Theresa of Austria (d. 1855) |
| 31472 | March 21 | Birth | 1806 – Benito Juárez, Mexican lawyer and politician, 25th President of Mexico (d. 1872) |
| 31473 | March 21 | Birth | 1811 – Nathaniel Woodard, English priest and educator (d. 1891) |
| 31474 | March 21 | Birth | 1825 – Alexander Mozhaysky, Russian soldier and engineer (d. 1890) |
| 31475 | March 21 | Birth | 1835 – Thomas Hayward, English cricketer (d. 1876) |
| 31476 | March 21 | Birth | 1839 – Modest Mussorgsky, Russian pianist and composer (d. 1881) |
| 31477 | March 21 | Birth | 1854 – Alick Bannerman, Australian cricketer and coach (d. 1924) |
| 31478 | March 21 | Birth | 1857 – Alice Henry, Australian journalist and activist (d. 1943) |
| 31479 | March 21 | Birth | 1859 – Daria Pratt, American golfer (d. 1938) |
| 31480 | March 21 | Birth | 1865 – George Owen Squier, American general (d. 1934) |
| 31481 | March 21 | Birth | 1866 – Antonia Maury, American astronomer and astrophysicist (d. 1952) |
| 31482 | March 21 | Birth | 1867 – Florenz Ziegfeld, Jr., American director and producer (d. 1932) |
| 31483 | March 21 | Birth | 1869 – David Robertson, Scottish-English golfer and rugby player (d. 1937) |
| 31484 | March 21 | Birth | 1874 – Alfred Tysoe, English runner (d. 1901) |
| 31485 | March 21 | Birth | 1876 – Walter Tewksbury, American runner and hurdler (d. 1968) |
| 31486 | March 21 | Birth | 1877 – Maurice Farman, French race car driver and pilot (d. 1964) |
| 31487 | March 21 | Birth | 1880 – Broncho Billy Anderson, American actor, director, and producer (d. 1971) |
| 31488 | March 21 | Birth | 1880 – Hans Hofmann, German-American painter and academic (d. 1966) |
| 31489 | March 21 | Birth | 1882 – Aleksander Kesküla, Estonian politician (d. 1963) |
| 31490 | March 21 | Birth | 1882 – Bascom Lamar Lunsford, American singer and lawyer (d. 1973) |
| 31491 | March 21 | Birth | 1884 – George David Birkhoff, American mathematician (d. 1944) |
| 31492 | March 21 | Birth | 1885 – Pierre Renoir, French actor and director (d. 1952) |
| 31493 | March 21 | Birth | 1886 – Walter Dray, American pole vaulter (d. 1973) |
| 31494 | March 21 | Birth | 1887 – Clarice Beckett, Australian painter (d. 1935) |
| 31495 | March 21 | Birth | 1887 – M. N. Roy, Indian philosopher and politician (d. 1954) |
| 31496 | March 21 | Birth | 1889 – Jock Sutherland, American football player and coach (d. 1948) |
| 31497 | March 21 | Birth | 1891 – Jonathan Hale, Canadian-American actor (d. 1966) |
| 31498 | March 21 | Birth | 1895 – Zlatko Baloković, Croatian-American violinist (d. 1955) |
| 31499 | March 21 | Birth | 1897 – Sim Gokkes, Dutch composer and conductor (d. 1943) |
| 31500 | March 21 | Birth | 1897 – Salvador Lutteroth, Mexican wrestling promoter, founded Consejo Mundial de Lucha Libre (d. 1987) |