| 40831 | April 9 | Birth | 1913 – Smaro Stefanidou, Greek actress (d. 2010) |
| 40832 | April 9 | Birth | 1915 – Daniel Johnson, Sr., Canadian lawyer and politician, 20th Premier of Quebec (d. 1968) |
| 40833 | April 9 | Birth | 1917 – Johannes Bobrowski, German songwriter and poet (d. 1965) |
| 40834 | April 9 | Birth | 1917 – Ronnie Burgess, Welsh footballer and manager (d. 2005) |
| 40835 | April 9 | Birth | 1917 – Brad Dexter, American actor and producer (d. 2002) |
| 40836 | April 9 | Birth | 1918 – Jørn Utzon, Danish architect, designed the Sydney Opera House (d. 2008) |
| 40837 | April 9 | Birth | 1919 – J. Presper Eckert, American engineer, invented the ENIAC (d. 1995) |
| 40838 | April 9 | Birth | 1921 – Jean-Marie Balestre, French businessman (d. 2008) |
| 40839 | April 9 | Birth | 1921 – Frankie Thomas, American actor (d. 2006) |
| 40840 | April 9 | Birth | 1922 – Carl Amery, German author and activist (d. 2005) |
| 40841 | April 9 | Birth | 1923 – Leonard Levy, American historian and author (d. 2006) |
| 40842 | April 9 | Birth | 1925 – Virginia Gibson, American actress, singer, and dancer (d. 2013) |
| 40843 | April 9 | Birth | 1925 – Art Kane, American photographer (d. 1995) |
| 40844 | April 9 | Birth | 1926 – Gerry Fitt, Northern Irish soldier and politician British life peer (d. 2005) |
| 40845 | April 9 | Birth | 1926 – Hugh Hefner, American publisher, founded Playboy Enterprises |
| 40846 | April 9 | Birth | 1928 – Paul Arizin, American basketball player (d. 2006) |
| 40847 | April 9 | Birth | 1928 – Tom Lehrer, American singer-songwriter, pianist, and mathematician |
| 40848 | April 9 | Birth | 1928 – Aubrey Woods, English actor and singer (d. 2013) |
| 40849 | April 9 | Birth | 1929 – Sharan Rani Backliwal, Indian sarod player and scholar (d. 2008) |
| 40850 | April 9 | Birth | 1929 – Paule Marshall, American author and academic |
| 40851 | April 9 | Birth | 1930 – Nathaniel Branden, Canadian-American psychotherapist and author (d. 2014) |
| 40852 | April 9 | Birth | 1930 – F. Albert Cotton, American chemist and academic (d. 2007) |
| 40853 | April 9 | Birth | 1930 – Wallace McCain, Canadian businessman, founded McCain Foods (d. 2011) |
| 40854 | April 9 | Birth | 1931 – Richard Hatfield, Canadian lawyer and politician, 26th Premier of New Brunswick (d. 1991) |
| 40855 | April 9 | Birth | 1932 – Jim Fowler, American zoologist and television host |
| 40856 | April 9 | Birth | 1932 – Armin Jordan, Swiss conductor (d. 2006) |
| 40857 | April 9 | Birth | 1932 – Peter Moores, English businessman and philanthropist |
| 40858 | April 9 | Birth | 1932 – Carl Perkins, American singer-songwriter and guitarist (d. 1998) |
| 40859 | April 9 | Birth | 1933 – Jean-Paul Belmondo, French actor and producer |
| 40860 | April 9 | Birth | 1933 – René Burri, Swiss photographer and journalist (d. 2014) |