| 45571 | April 20 | Birth | 1895 – Emile Christian, American trombonist and composer (d. 1973) |
| 45572 | April 20 | Birth | 1895 – Henry de Montherlant, French author and playwright (d. 1972) |
| 45573 | April 20 | Birth | 1896 – Wop May, Canadian captain and pilot (d. 1952) |
| 45574 | April 20 | Birth | 1899 – Alan Arnett McLeod, Canadian lieutenant, Victoria Cross recipient (d. 1918) |
| 45575 | April 20 | Birth | 1904 – Bruce Cabot, American actor (d. 1972) |
| 45576 | April 20 | Birth | 1907 – Augoustinos Kantiotes, Greek bishop (d. 2010) |
| 45577 | April 20 | Birth | 1908 – Lionel Hampton, American vibraphone player, pianist, bandleader, and actor (d. 2002) |
| 45578 | April 20 | Birth | 1913 – Mimis Fotopoulos, Greek actor and poet (d. 1986) |
| 45579 | April 20 | Birth | 1913 – Willi Hennig, German biologist and entomologist (d. 1976) |
| 45580 | April 20 | Birth | 1913 – Roger Rochard, French runner (d. 1993) |
| 45581 | April 20 | Birth | 1914 – Betty Lou Gerson, American actress (d. 1999) |
| 45582 | April 20 | Birth | 1915 – Joseph Wolpe, South African-American psychotherapist and physician (d. 1997) |
| 45583 | April 20 | Birth | 1916 – Phil Walters, American race car driver and pilot (d. 2000) |
| 45584 | April 20 | Birth | 1916 – Nasiba Zeynalova, Azerbaijani actress (d. 2004) |
| 45585 | April 20 | Birth | 1918 – Edward L. Beach Jr., American captain and author (d. 2002) |
| 45586 | April 20 | Birth | 1918 – Kai Siegbahn, Swedish physicist and academic, Nobel Prize laureate (d. 2007) |
| 45587 | April 20 | Birth | 1919 – Richard Hillary, Australian lieutenant and pilot (d. 1943) |
| 45588 | April 20 | Birth | 1920 – Clement Isong, Nigerian banker and politician, Governor of Cross River State (d. 2000) |
| 45589 | April 20 | Birth | 1920 – Ronald Speirs, American colonel (d. 2007) |
| 45590 | April 20 | Birth | 1920 – John Paul Stevens, American lieutenant and judge |
| 45591 | April 20 | Birth | 1921 – Peter Baker, English soldier, author, publisher and politician (d. 1966) |
| 45592 | April 20 | Birth | 1921 – Janine Sutto, French-Canadian actress |
| 45593 | April 20 | Birth | 1923 – Mother Angelica, American nun and broadcaster, founded Eternal Word Television Network |
| 45594 | April 20 | Birth | 1923 – Irene Lieblich, Polish-American painter and illustrator (d. 2008) |
| 45595 | April 20 | Birth | 1923 – Tito Puente, American drummer and producer (d. 2000) |
| 45596 | April 20 | Birth | 1924 – Nina Foch, Dutch-American actress and educator (d. 2008) |
| 45597 | April 20 | Birth | 1924 – Leslie Phillips, English actor and producer |
| 45598 | April 20 | Birth | 1924 – Guy Rocher, Canadian sociologist and academic |
| 45599 | April 20 | Birth | 1925 – Ernie Stautner, German-American football player and coach (d. 2006) |
| 45600 | April 20 | Birth | 1927 – Bud Cullen, Canadian judge and politician, 1st Canadian Minister of Employment and Immigration (d. 2005) |