| 45811 | April 20 | Birth | 1995 – Jean Marie Dongou, Cameroonian footballer |
| 45812 | April 20 | Birth | 1999 – Carly Rose Sonenclar, American actress and singer |
| 45813 | April 20 | Birth | 2002 – Twist Magic, French race horse (d. 2010) |
| 45814 | April 20 | Birth | 2007 – Zarkandar, Irish race horse |
| 45815 | April 20 | Death | 767 – Taichō, Japanese monk (b. 682) |
| 45816 | April 20 | Death | 1176 – Richard de Clare, 2nd Earl of Pembroke, English-Irish politician, Lord Chief Justice of Ireland (b. 1130) |
| 45817 | April 20 | Death | 1314 – Pope Clement V (b. 1264) |
| 45818 | April 20 | Death | 1517 – Bogdan III the One-Eyed, Romanian son of Stephen III of Moldavia (b. 1470) |
| 45819 | April 20 | Death | 1521 – Zhengde Emperor of China (b. 1491) |
| 45820 | April 20 | Death | 1534 – Elizabeth Barton, English nun and martyr (b. 1506) |
| 45821 | April 20 | Death | 1558 – Johannes Bugenhagen, German priest and theologian (b. 1485) |
| 45822 | April 20 | Death | 1643 – Christoph Demantius, German composer and poet (b. 1567) |
| 45823 | April 20 | Death | 1703 – Lancelot Addison, English clergyman and educator (b. 1632) |
| 45824 | April 20 | Death | 1769 – Chief Pontiac, American tribal leader (b. 1720) |
| 45825 | April 20 | Death | 1831 – John Abernethy, English surgeon and anatomist (b. 1764) |
| 45826 | April 20 | Death | 1873 – William Tite, English architect, designed the Royal Exchange (b. 1798) |
| 45827 | April 20 | Death | 1874 – Alexander H. Bailey, American lawyer, judge, and politician (b. 1817) |
| 45828 | April 20 | Death | 1886 – Charles-François-Frédéric, marquis de Montholon-Sémonville, French general and diplomat, French ambassador to the United States (b. 1814) |
| 45829 | April 20 | Death | 1887 – Muhammad Sharif Pasha, Greek-Egyptian politician, 2nd Prime Minister of Egypt (b. 1826) |
| 45830 | April 20 | Death | 1899 – Joseph Wolf, German ornithologist and illustrator (b. 1820) |
| 45831 | April 20 | Death | 1902 – Joaquim de Sousa Andrade, Brazilian poet and educator (b. 1833) |
| 45832 | April 20 | Death | 1912 – Bram Stoker, Irish-English author, created Count Dracula (b. 1847) |
| 45833 | April 20 | Death | 1918 – Karl Ferdinand Braun, German-American physicist and academic, Nobel Prize laureate (b. 1850) |
| 45834 | April 20 | Death | 1927 – Enrique Simonet, Spanish painter and educator (b. 1866) |
| 45835 | April 20 | Death | 1929 – Prince Henry of Prussia (b. 1862) |
| 45836 | April 20 | Death | 1931 – Sir Cosmo Duff-Gordon, 5th Baronet, Scottish-English fencer and businessman (b. 1862) |
| 45837 | April 20 | Death | 1932 – Giuseppe Peano, Italian mathematician and philosopher (b. 1858) |
| 45838 | April 20 | Death | 1935 – John Cameron, Scottish footballer and manager (b. 1872) |
| 45839 | April 20 | Death | 1935 – Lucy, Lady Duff-Gordon, English fashion designer (b. 1863) |
| 45840 | April 20 | Death | 1942 – Jüri Jaakson, Estonian businessman and politician, 6th State Elder of Estonia (b. 1870) |