| 70861 | June 21 | Birth | 1903 – Hermann Engelhard, German runner and coach (d. 1984) |
| 70862 | June 21 | Birth | 1903 – Al Hirschfeld, American painter and illustrator (d. 2003) |
| 70863 | June 21 | Birth | 1905 – Jacques Goddet, French journalist (d. 2000) |
| 70864 | June 21 | Birth | 1905 – Jean-Paul Sartre, French philosopher and author (d. 1980) |
| 70865 | June 21 | Birth | 1906 – Helene Costello, American actress (d. 1957) |
| 70866 | June 21 | Birth | 1906 – Nusch Éluard, French model, painter, and photographer (d. 1946) |
| 70867 | June 21 | Birth | 1906 – Harold Spina, American composer (d. 1997) |
| 70868 | June 21 | Birth | 1906 – Grete Sultan, German-American pianist and educator (d. 2005) |
| 70869 | June 21 | Birth | 1908 – William Frankena, American philosopher and academic (d. 1994) |
| 70870 | June 21 | Birth | 1909 – Helmut Möckel, German soldier and politician (d. 1945) |
| 70871 | June 21 | Birth | 1910 – Aleksandr Tvardovsky, Russian poet and author (d. 1971) |
| 70872 | June 21 | Birth | 1911 – Irving Fein, American producer and manager (d. 2012) |
| 70873 | June 21 | Birth | 1911 – Chester Wilmot, Australian journalist and historian (d. 1954) |
| 70874 | June 21 | Birth | 1912 – Kazimierz Leski, Polish pilot and engineer (d. 2000) |
| 70875 | June 21 | Birth | 1912 – Mary McCarthy, American author and critic (d. 1989) |
| 70876 | June 21 | Birth | 1912 – Vishnu Prabhakar, Indian author and playwright (d. 2009) |
| 70877 | June 21 | Birth | 1913 – Madihe Pannaseeha Thero, Sri Lankan monk and scholar (d. 2003) |
| 70878 | June 21 | Birth | 1914 – William Vickrey, Canadian-American economist and academic, Nobel Prize laureate (d. 1996) |
| 70879 | June 21 | Birth | 1915 – Jean Bastien, French professional footballer (d. 1969) |
| 70880 | June 21 | Birth | 1915 – Wilhelm Gliese, German soldier and astronomer (d. 1993) |
| 70881 | June 21 | Birth | 1916 – Joseph Cyril Bamford, English businessman, founded J. C. Bamford (d. 2001) |
| 70882 | June 21 | Birth | 1916 – Herbert Friedman, American physicist and astronomer (d. 2000) |
| 70883 | June 21 | Birth | 1916 – Buddy O'Connor, Canadian ice hockey player (d. 1977) |
| 70884 | June 21 | Birth | 1918 – Robert A. Boyd, Canadian engineer (d. 2006) |
| 70885 | June 21 | Birth | 1918 – Kasper Idland, Norwegian lieutenant (d. 1968) |
| 70886 | June 21 | Birth | 1918 – James Joll, English historian, author, and academic (d. 1994) |
| 70887 | June 21 | Birth | 1918 – Ekkehard Kylling-Schmidt, German soldier (d. 2000) |
| 70888 | June 21 | Birth | 1918 – Eddie Lopat, American baseball player, coach, and manager (d. 1992) |
| 70889 | June 21 | Birth | 1918 – J. Clyde Mitchell, English sociologist and anthropologist (d. 1995) |
| 70890 | June 21 | Birth | 1918 – Dee Molenaar, American mountaineer, painter, and author |