| 45601 | April 20 | Birth | 1927 – Phil Hill, American race car driver (d. 2008) |
| 45602 | April 20 | Birth | 1927 – K. Alex Müller, Swiss physicist and academic, Nobel Prize laureate |
| 45603 | April 20 | Birth | 1928 – Robert Byrne, American chess player and author (d. 2013) |
| 45604 | April 20 | Birth | 1928 – Johnny Gavin, Irish footballer (d. 2007) |
| 45605 | April 20 | Birth | 1928 – Arvo Kruusement, Estonian actor and director |
| 45606 | April 20 | Birth | 1929 – Harry Agganis, American baseball and football player (d. 1955) |
| 45607 | April 20 | Birth | 1929 – Bobby Hollander, American film director, actor, and magazine publisher (d. 2002) |
| 45608 | April 20 | Birth | 1930 – Dwight Gustafson, American composer and conductor (d. 2014) |
| 45609 | April 20 | Birth | 1930 – Antony Jay, English director and screenwriter |
| 45610 | April 20 | Birth | 1931 – Michael Allenby, 3rd Viscount Allenby, English lieutenant and politician (d. 2014) |
| 45611 | April 20 | Birth | 1931 – John Eccles, 2nd Viscount Eccles, English businessman and politician |
| 45612 | April 20 | Birth | 1933 – Aimée Beekman, Estonian author |
| 45613 | April 20 | Birth | 1936 – Pauli Ellefsen, Faroese technician, surveyor, and politician, 6th Prime Minister of the Faroe Islands (d. 2012) |
| 45614 | April 20 | Birth | 1936 – Pat Roberts, American captain, journalist, and politician |
| 45615 | April 20 | Birth | 1936 – Christopher Robinson, English organist and conductor |
| 45616 | April 20 | Birth | 1937 – George Takei, American actor |
| 45617 | April 20 | Birth | 1937 – Antonios Kounadis, Greek discus thrower |
| 45618 | April 20 | Birth | 1937 – Jiří Dienstbier, Czech journalist and politician, Czech Minister of Foreign Affairs (d. 2011) |
| 45619 | April 20 | Birth | 1937 – Harvey Quaytman, American painter and educator (d. 2002) |
| 45620 | April 20 | Birth | 1938 – Betty Cuthbert, Australian sprinter |
| 45621 | April 20 | Birth | 1938 – Manfred Kinder, German runner |
| 45622 | April 20 | Birth | 1938 – Peter Snow, Irish historian and journalist |
| 45623 | April 20 | Birth | 1938 – Eszter Tamási, Hungarian actress (d. 1991) |
| 45624 | April 20 | Birth | 1939 – Peter S. Beagle, American author and screenwriter |
| 45625 | April 20 | Birth | 1939 – Ray Brooks, English actor |
| 45626 | April 20 | Birth | 1939 – Gro Harlem Brundtland, Norwegian physician and politician, 22nd Prime Minister of Norway |
| 45627 | April 20 | Birth | 1939 – Johnny Tillotson, American singer-songwriter |
| 45628 | April 20 | Birth | 1940 – James Gammon, American actor (d. 2010) |
| 45629 | April 20 | Birth | 1941 – David L. Boren, American lawyer and politician, 21st Governor of Oklahoma |
| 45630 | April 20 | Birth | 1941 – Ryan O'Neal, American actor and boxer |