| 45631 | April 20 | Birth | 1942 – Giles Henderson, English lawyer and academic |
| 45632 | April 20 | Birth | 1942 – Arto Paasilinna, Finnish journalist and author |
| 45633 | April 20 | Birth | 1943 – Alan Beith, English academic and politician |
| 45634 | April 20 | Birth | 1943 – John Eliot Gardiner, English conductor and director |
| 45635 | April 20 | Birth | 1943 – Jamie Gillis, American porn actor and director (d. 2010) |
| 45636 | April 20 | Birth | 1943 – Edie Sedgwick, American model and actress (d. 1971) |
| 45637 | April 20 | Birth | 1944 – Toivo Aare, Estonian journalist and author (d. 1999) |
| 45638 | April 20 | Birth | 1945 – Michael Brandon, American actor and director |
| 45639 | April 20 | Birth | 1945 – Alistair Cooke, Baron Lexden, English historian and author |
| 45640 | April 20 | Birth | 1945 – Bobby Jameson, American singer-songwriter (d. 2015) |
| 45641 | April 20 | Birth | 1945 – Judith O'Dea, American actress |
| 45642 | April 20 | Birth | 1945 – Thein Sein, Burmese general and politician, 8th President of Burma |
| 45643 | April 20 | Birth | 1945 – Steve Spurrier, American football player and coach |
| 45644 | April 20 | Birth | 1945 – Naftali Temu, Kenyan runner (d. 2003) |
| 45645 | April 20 | Birth | 1946 – Sandro Chia, Italian painter and sculptor |
| 45646 | April 20 | Birth | 1946 – Jānis Doniņš, Latvian-American javelin thrower |
| 45647 | April 20 | Birth | 1946 – Diane Elson, English sociologist and academic |
| 45648 | April 20 | Birth | 1946 – Tommy Hutton, American baseball player and sportscaster |
| 45649 | April 20 | Birth | 1946 – Martin McGrady, American runner (d. 2006) |
| 45650 | April 20 | Birth | 1946 – Julien Poulin, Canadian actor, director, producer, and screenwriter |
| 45651 | April 20 | Birth | 1946 – Gordon Smiley, American race car driver (d. 1982) |
| 45652 | April 20 | Birth | 1947 – Rita Dionne-Marsolais, Canadian economist and politician |
| 45653 | April 20 | Birth | 1947 – David Leland, English actor, director, and screenwriter |
| 45654 | April 20 | Birth | 1947 – Ken Scott, English record producer and engineer |
| 45655 | April 20 | Birth | 1947 – Björn Skifs, Swedish singer-songwriter, actor, and screenwriter (Blue Swede and Slam Creepers) |
| 45656 | April 20 | Birth | 1947 – Viktor Suvorov, Russian intelligence officer, historian, and author |
| 45657 | April 20 | Birth | 1947 – Andrew Tobias, American journalist and author |
| 45658 | April 20 | Birth | 1948 – Craig Frost, American pianist and songwriter (Grand Funk Railroad) |
| 45659 | April 20 | Birth | 1948 – Merlin Hay, 24th Earl of Erroll, Scottish colonel and politician, Lord High Constable of Scotland |
| 45660 | April 20 | Birth | 1948 – Gregory Itzin, American actor |