| 82531 | July 21 | Birth | 1875 – Charles Gondouin, French rugby player and tug of war competitor (d. 1947) |
| 82532 | July 21 | Birth | 1880 – Milan Rastislav Štefánik, Slovak astronomer, general, and politician (d. 1919) |
| 82533 | July 21 | Birth | 1882 – David Burliuk, Ukrainian author and illustrator (d. 1967) |
| 82534 | July 21 | Birth | 1885 – Jacques Feyder, Belgian actor, director, and screenwriter (d. 1948) |
| 82535 | July 21 | Birth | 1891 – Julius Saaristo, Finnish javelin thrower and soldier (d. 1969) |
| 82536 | July 21 | Birth | 1893 – Hans Fallada, German author (d. 1947) |
| 82537 | July 21 | Birth | 1898 – Sara Carter, American singer-songwriter (Carter Family) (d. 1979) |
| 82538 | July 21 | Birth | 1899 – Hart Crane, American poet and author (d. 1932) |
| 82539 | July 21 | Birth | 1899 – Ernest Hemingway, American novelist, short story writer, and journalist, Nobel Prize laureate (d. 1961) |
| 82540 | July 21 | Birth | 1903 – Russell Lee, American photographer and journalist (d. 1986) |
| 82541 | July 21 | Birth | 1903 – Roy Neuberger, American businessman and financier, co-founded Neuberger Berman (d. 2010) |
| 82542 | July 21 | Birth | 1908 – Jug McSpaden, American golfer and architect (d. 1996) |
| 82543 | July 21 | Birth | 1911 – Marshall McLuhan, Canadian author and theorist (d. 1980) |
| 82544 | July 21 | Birth | 1911 – Umashankar Joshi, Indian author, poet, and scholar (d. 1988) |
| 82545 | July 21 | Birth | 1914 – Aleksander Kreek, Estonian shot putter and discus thrower (d. 1977) |
| 82546 | July 21 | Birth | 1917 – Alan B. Gold, Canadian lawyer and jurist (d. 2005) |
| 82547 | July 21 | Birth | 1920 – Constant Nieuwenhuys, Dutch painter, sculptor, and illustrator (d. 2005) |
| 82548 | July 21 | Birth | 1920 – Isaac Stern, Polish violinist and conductor (d. 2001) |
| 82549 | July 21 | Birth | 1921 – James Cooke Brown, American sociologist and author (d. 2000) |
| 82550 | July 21 | Birth | 1921 – John Horsley, English actor (b. 2014) |
| 82551 | July 21 | Birth | 1922 – Kay Starr, American singer and actress |
| 82552 | July 21 | Birth | 1922 – Mollie Sugden, English actress and singer (d. 2009) |
| 82553 | July 21 | Birth | 1923 – Rudolph A. Marcus, Canadian-American chemist and academic, Nobel Prize laureate |
| 82554 | July 21 | Birth | 1924 – Don Knotts, American actor and screenwriter (d. 2006) |
| 82555 | July 21 | Birth | 1926 – Paul Burke, American actor (d. 2009) |
| 82556 | July 21 | Birth | 1926 – Norman Jewison, Canadian actor, director, and producer |
| 82557 | July 21 | Birth | 1926 – Rahimuddin Khan, Pakistani general and politician, 7th Governor of Balochistan |
| 82558 | July 21 | Birth | 1926 – Bill Pertwee, English actor (d. 2013) |
| 82559 | July 21 | Birth | 1926 – Karel Reisz, Czech-English director and producer (d. 2002) |
| 82560 | July 21 | Birth | 1926 – Queenie Watts, English actress and singer (d. 1980) |