| 31021 | March 20 | Event | 2015 – A Solar eclipse, equinox, and a Supermoon all occur on the same day. |
| 31022 | March 20 | Birth | 43 BC – Ovid, Roman poet (d. 17) |
| 31023 | March 20 | Birth | 1469 – Cecily of York (d. 1507) |
| 31024 | March 20 | Birth | 1477 – Jerome Emser, German theologian and scholar (d. 1527) |
| 31025 | March 20 | Birth | 1502 – Pierino Belli, Italian soldier and jurist (d. 1575) |
| 31026 | March 20 | Birth | 1639 – Ivan Mazepa, Ukrainian diplomat, Hetman of Ukraine (d. 1709) |
| 31027 | March 20 | Birth | 1725 – Abdul Hamid I, Ottoman sultan (d. 1789) |
| 31028 | March 20 | Birth | 1735 – Torbern Bergman, Swedish chemist and mineralogist (d. 1784) |
| 31029 | March 20 | Birth | 1736 – Buddha Yodfa Chulaloke, Thai king (d. 1809) |
| 31030 | March 20 | Birth | 1770 – Friedrich Hölderlin, German poet and author (d. 1843) |
| 31031 | March 20 | Birth | 1771 – Heinrich Clauren, German author (d. 1854) |
| 31032 | March 20 | Birth | 1799 – Karl August Nicander, Swedish poet and author (d. 1839) |
| 31033 | March 20 | Birth | 1800 – Braulio Carrillo Colina, Costa Rican lawyer and politician, President of Costa Rica (d. 1845) |
| 31034 | March 20 | Birth | 1811 – Napoleon II, French emperor (d. 1832) |
| 31035 | March 20 | Birth | 1811 – George Caleb Bingham, American painter and politician, State Treasurer of Missouri (d. 1879) |
| 31036 | March 20 | Birth | 1821 – Ned Buntline, American journalist, author, and publisher (d. 1886) |
| 31037 | March 20 | Birth | 1824 – Theodor von Heuglin, German explorer and ornithologist (d. 1876) |
| 31038 | March 20 | Birth | 1828 – Henrik Ibsen, Norwegian poet, playwright, and director (d. 1906) |
| 31039 | March 20 | Birth | 1831 – Solomon L. Spink, American lawyer and politician (d. 1881) |
| 31040 | March 20 | Birth | 1834 – Charles William Eliot, American mathematician and academic (d. 1926) |
| 31041 | March 20 | Birth | 1836 – Ferris Jacobs, Jr., American general, lawyer, and politician (d. 1886) |
| 31042 | March 20 | Birth | 1836 – Edward Poynter, English painter, illustrator, and curator (d. 1919) |
| 31043 | March 20 | Birth | 1840 – Illarion Pryanishnikov, Russian painter (d. 1894) |
| 31044 | March 20 | Birth | 1851 – Ismail Gasprinski, Ukrainian educator, publisher, and politician (d. 1914) |
| 31045 | March 20 | Birth | 1852 – Frank MacKey, American polo player (d. 1927) |
| 31046 | March 20 | Birth | 1856 – John Lavery, Irish painter (d. 1941) |
| 31047 | March 20 | Birth | 1856 – Frederick Winslow Taylor, American tennis player and engineer (d. 1915) |
| 31048 | March 20 | Birth | 1865 – Jehanne d'Alcy, French film actress (d. 1956) |
| 31049 | March 20 | Birth | 1870 – Paul von Lettow-Vorbeck, German general (d. 1964) |
| 31050 | March 20 | Birth | 1874 – Börries von Münchhausen, German poet and activist (d. 1945) |