| 31291 | March 20 | Death | 1181 – Taira no Kiyomori, Japanese general (b. 1118) |
| 31292 | March 20 | Death | 1191 – Pope Clement III (b. 1130) |
| 31293 | March 20 | Death | 1239 – Hermann von Salza, German knight and diplomat (b. 1179) |
| 31294 | March 20 | Death | 1390 – Alexios III of Trebizond (b. 1338) |
| 31295 | March 20 | Death | 1413 – Henry IV of England (b. 1367) |
| 31296 | March 20 | Death | 1549 – Thomas Seymour, 1st Baron Seymour of Sudeley, English general and politician, Lord Warden of the Cinque Ports (b. 1508) |
| 31297 | March 20 | Death | 1568 – Albert, Duke in Prussia (b. 1490) |
| 31298 | March 20 | Death | 1619 – Matthias, Holy Roman Emperor (b. 1557) |
| 31299 | March 20 | Death | 1673 – Augustyn Kordecki, Polish monk (b. 1603) |
| 31300 | March 20 | Death | 1726 – Isaac Newton, English physicist, mathematician, astronomer, and philosopher (b. 1642) |
| 31301 | March 20 | Death | 1730 – Adrienne Lecouvreur, French actress (b. 1692) |
| 31302 | March 20 | Death | 1746 – Nicolas de Largillière, French painter and academic (b. 1656) |
| 31303 | March 20 | Death | 1780 – Benjamin Truman, English brewer and businessman (b. 1699) |
| 31304 | March 20 | Death | 1793 – William Murray, 1st Earl of Mansfield, Scottish judge and politician, Attorney General for England and Wales (b. 1705) |
| 31305 | March 20 | Death | 1809 – Mary Bateman, English criminal (b. 1768) |
| 31306 | March 20 | Death | 1835 – Louis Léopold Robert, French painter (b. 1794) |
| 31307 | March 20 | Death | 1849 – James Justinian Morier, Turkish-English author and diplomat (b. 1780) |
| 31308 | March 20 | Death | 1855 – Joseph Aspdin, English businessman (b. 1788) |
| 31309 | March 20 | Death | 1865 – Yamanami Keisuke, Japanese samurai (b. 1833) |
| 31310 | March 20 | Death | 1874 – Hans Christian Lumbye, Danish composer and conductor (b. 1810) |
| 31311 | March 20 | Death | 1878 – Julius Robert von Mayer, German physician and physicist (b. 1814) |
| 31312 | March 20 | Death | 1897 – Apollon Maykov, Russian poet and playwright (b. 1821) |
| 31313 | March 20 | Death | 1899 – Franz Ritter von Hauer, Austrian geologist and author (b. 1822) |
| 31314 | March 20 | Death | 1909 – Friedrich Amelung, Estonian historian and businessman (b. 1842) |
| 31315 | March 20 | Death | 1916 – Ota Benga, Congolese-American model (b. 1884) |
| 31316 | March 20 | Death | 1918 – Lewis A. Grant, American general and lawyer (b. 1828) |
| 31317 | March 20 | Death | 1924 – Emil Fenyvessy, Hungarian actor and screenwriter (b. 1859) |
| 31318 | March 20 | Death | 1925 – George Curzon, 1st Marquess Curzon of Kedleston, English politician, 35th Governor-General of India (b. 1859) |
| 31319 | March 20 | Death | 1929 – Ferdinand Foch, French field marshal (b. 1851) |
| 31320 | March 20 | Death | 1930 – Arthur F. Andrews, American cyclist (b. 1876) |