| 45541 | April 20 | Birth | 1818 – Heinrich Göbel, German-American mechanic and engineer (d. 1893) |
| 45542 | April 20 | Birth | 1826 – Dinah Craik, English author and poet (d. 1887) |
| 45543 | April 20 | Birth | 1836 – Eli Whitney Blake, Jr., American scientist and academic (d. 1895) |
| 45544 | April 20 | Birth | 1840 – Odilon Redon, French painter and illustrator (d. 1916) |
| 45545 | April 20 | Birth | 1850 – Daniel Chester French, American sculptor, designed the Lincoln statue (d. 1931) |
| 45546 | April 20 | Birth | 1851 – Siegmund Lubin, Polish-American businessman, founded the Lubin Manufacturing Company (d. 1923) |
| 45547 | April 20 | Birth | 1851 – Young Tom Morris, Scottish golfer (d. 1875) |
| 45548 | April 20 | Birth | 1860 – Justinien de Clary, French target shooter (d. 1933) |
| 45549 | April 20 | Birth | 1871 – Sydney Chapman, English economist and civil servant (d. 1951) |
| 45550 | April 20 | Birth | 1875 – Vladimir Vidrić, Croatian poet and lawyer (d. 1909) |
| 45551 | April 20 | Birth | 1879 – Paul Poiret, French fashion designer (d. 1944) |
| 45552 | April 20 | Birth | 1882 – Holland Smith, American general (d. 1967) |
| 45553 | April 20 | Birth | 1884 – Princess Beatrice of Saxe-Coburg and Gotha (d. 1966) |
| 45554 | April 20 | Birth | 1884 – Oliver Kirk, American boxer (d. 1960) |
| 45555 | April 20 | Birth | 1884 – Daniel Varoujan, Armenian poet and educator (d. 1915) |
| 45556 | April 20 | Birth | 1889 – Albert Jean Amateau, Turkish rabbi, lawyer, and activist (d. 1996) |
| 45557 | April 20 | Birth | 1889 – Harold Bache, English cricketer and lieutenant (d. 1916) |
| 45558 | April 20 | Birth | 1889 – A. J. Balaban, American businessman, co-founded Balaban and Katz (d. 1962) |
| 45559 | April 20 | Birth | 1889 – Robert Butler, Australian tailor and politician (d. 1950) |
| 45560 | April 20 | Birth | 1889 – Walter Costello, American gangster (d. 1917) |
| 45561 | April 20 | Birth | 1889 – Prince Erik, Duke of Västmanland (d. 1918) |
| 45562 | April 20 | Birth | 1889 – Marie-Antoinette de Geuser, French mystic (d. 1918) |
| 45563 | April 20 | Birth | 1889 – S. W. Harrington, American football player, coach, and physician (d. 1975) |
| 45564 | April 20 | Birth | 1889 – Adolf Hitler, Austrian-German soldier and politician, Chancellor of Germany (d. 1945) |
| 45565 | April 20 | Birth | 1889 – Tonny Kessler, Dutch footballer (d. 1960) |
| 45566 | April 20 | Birth | 1890 – Maurice Duplessis, Canadian lawyer and politician, 16th Premier of Quebec (d. 1959) |
| 45567 | April 20 | Birth | 1890 – Adolf Schärf, Austrian soldier and politician, 6th President of Austria (d. 1965) |
| 45568 | April 20 | Birth | 1893 – Harold Lloyd, American actor and producer (d. 1971) |
| 45569 | April 20 | Birth | 1893 – Joan Miró, Spanish painter and sculptor (d. 1983) |
| 45570 | April 20 | Birth | 1893 – Edna Parker, American super-centenarian (d. 2008) |