| 42511 | April 13 | Birth | 1917 – Robert Orville Anderson, American businessman, founded Atlantic Richfield Oil Co. (d. 2007) |
| 42512 | April 13 | Birth | 1917 – Bill Clements, American soldier, engineer, and politician, 15th United States Deputy Secretary of Defense (d. 2011) |
| 42513 | April 13 | Birth | 1919 – Roland Gaucher, French journalist and politician (d. 2007) |
| 42514 | April 13 | Birth | 1919 – Howard Keel, American actor and singer (d. 2004) |
| 42515 | April 13 | Birth | 1919 – Madalyn Murray O'Hair, American activist, founded American Atheists (d. 1995) |
| 42516 | April 13 | Birth | 1919 – Phil Tonken, American voice actor and producer (d. 2000) |
| 42517 | April 13 | Birth | 1920 – Roberto Calvi, Italian banker (d. 1982) |
| 42518 | April 13 | Birth | 1920 – Claude Cheysson, French lieutenant and politician, French Minister of Foreign Affairs (d. 2012) |
| 42519 | April 13 | Birth | 1920 – Liam Cosgrave, Irish lawyer and politician, 6th Taoiseach of Ireland |
| 42520 | April 13 | Birth | 1920 – John LaPorta, American clarinet player and saxophonist (d. 2004) |
| 42521 | April 13 | Birth | 1921 – Baron Hans Heinrich Thyssen-Bornemisza, Dutch-Swiss art collector and businessman (d. 2002) |
| 42522 | April 13 | Birth | 1922 – Heinz Baas, German footballer and manager (d. 1994) |
| 42523 | April 13 | Birth | 1922 – John Braine, English librarian and author (d. 1986) |
| 42524 | April 13 | Birth | 1922 – Julius Nyerere, Tanzanian educator and politician, 1st President of Tanzania (d. 1999) |
| 42525 | April 13 | Birth | 1922 – Valve Pormeister, Estonian architect (d. 2002) |
| 42526 | April 13 | Birth | 1923 – Don Adams, American actor and director (d. 2005) |
| 42527 | April 13 | Birth | 1923 – A. H. Halsey, English sociologist and academic (d. 2014) |
| 42528 | April 13 | Birth | 1923 – Stanley Tanger, American businessman and philanthropist, founded the Tanger Factory Outlet Centers (d. 2010) |
| 42529 | April 13 | Birth | 1924 – John T. Biggers, American painter (d. 2001) |
| 42530 | April 13 | Birth | 1924 – Jack T. Chick, American author, illustrator, and publisher |
| 42531 | April 13 | Birth | 1924 – Stanley Donen, American director and choreographer |
| 42532 | April 13 | Birth | 1926 – Ellie Lambeti, Greek actress (d. 1983) |
| 42533 | April 13 | Birth | 1926 – John Spencer-Churchill, 11th Duke of Marlborough, English businessman (d. 2014) |
| 42534 | April 13 | Birth | 1927 – Rosemary Haughton, English-American philosopher, theologian, and author |
| 42535 | April 13 | Birth | 1927 – Antonino Rocca, Italian-American wrestler (d. 1977) |
| 42536 | April 13 | Birth | 1927 – Maurice Ronet, French actor and director (d. 1983) |
| 42537 | April 13 | Birth | 1928 – Alan Clark, English historian and politician, Minister of State for Trade (d. 1999) |
| 42538 | April 13 | Birth | 1928 – Gianni Marzotto, Italian race car driver and businessman (d. 2012) |
| 42539 | April 13 | Birth | 1931 – Anita Cerquetti, Italian soprano (d. 2014) |
| 42540 | April 13 | Birth | 1931 – Robert Enrico, French director and screenwriter (d. 2001) |