| 43321 | April 15 | Birth | 1684 – Catherine I of Russia (d. 1727) |
| 43322 | April 15 | Birth | 1688 – Johann Friedrich Fasch, German violinist and composer (d. 1758) |
| 43323 | April 15 | Birth | 1707 – Leonhard Euler, Swiss mathematician and physicist (d. 1783) |
| 43324 | April 15 | Birth | 1710 – William Cullen, Scottish physician and chemist (d. 1790) |
| 43325 | April 15 | Birth | 1721 – Prince William, Duke of Cumberland (d. 1765) |
| 43326 | April 15 | Birth | 1741 – Charles Willson Peale, American painter and soldier (d. 1827) |
| 43327 | April 15 | Birth | 1771 – Nicolas Chopin, French-Polish educator (d. 1844) |
| 43328 | April 15 | Birth | 1772 – Étienne Geoffroy Saint-Hilaire, French biologist and zoologist (d. 1844) |
| 43329 | April 15 | Birth | 1783 – Maria Branwell, English mother of the Brontë family (d. 1821) |
| 43330 | April 15 | Birth | 1793 – Friedrich Georg Wilhelm von Struve, German astronomer and academic (d. 1864) |
| 43331 | April 15 | Birth | 1800 – James Clark Ross, English captain and explorer (d. 1862) |
| 43332 | April 15 | Birth | 1809 – Hermann Grassmann, German linguist and mathematician (d. 1877) |
| 43333 | April 15 | Birth | 1828 – Jean Danjou, French captain (d. 1863) |
| 43334 | April 15 | Birth | 1832 – Wilhelm Busch, German poet, painter, and illustrator (d. 1908) |
| 43335 | April 15 | Birth | 1841 – Joseph E. Seagram, Canadian businessman and politician, founded the Seagram Company Ltd (d. 1919) |
| 43336 | April 15 | Birth | 1843 – Henry James, American-English author (d. 1916) |
| 43337 | April 15 | Birth | 1851 – Ponnambalam Ramanathan, Sri Lankan lawyer and politician, 3rd Solicitor General of Sri Lanka (d. 1930) |
| 43338 | April 15 | Birth | 1856 – Jean Moréas, Greek poet and critic (d. 1910) |
| 43339 | April 15 | Birth | 1858 – Émile Durkheim, French sociologist, psychologist, and philosopher (d. 1917) |
| 43340 | April 15 | Birth | 1861 – Bliss Carman, Canadian-American poet and playwright (d. 1929) |
| 43341 | April 15 | Birth | 1874 – George Harrison Shull, American botanist and geneticist (d. 1954) |
| 43342 | April 15 | Birth | 1874 – Johannes Stark, German physicist and academic, Nobel Prize laureate (d. 1957) |
| 43343 | April 15 | Birth | 1875 – James J. Jeffries, American boxer and promoter (d. 1953) |
| 43344 | April 15 | Birth | 1878 – Robert Walser, Swiss author and playwright (d. 1956) |
| 43345 | April 15 | Birth | 1879 – Melville Henry Cane, American lawyer and poet (d. 1980) |
| 43346 | April 15 | Birth | 1883 – Stanley Bruce, Australian captain and politician, 8th Prime Minister of Australia (d. 1967) |
| 43347 | April 15 | Birth | 1885 – Tadeusz Kutrzeba, Polish general (d. 1947) |
| 43348 | April 15 | Birth | 1886 – Nikolay Gumilyov, Russian poet and critic (d. 1921) |
| 43349 | April 15 | Birth | 1888 – Maximilian Kronberger, German poet and author (d. 1904) |
| 43350 | April 15 | Birth | 1889 – Thomas Hart Benton, American painter and educator (d. 1975) |