| 38131 | April 3 | Event | 2008 – Texas law enforcement cordons off the FLDS's YFZ Ranch. Eventually 533 women and children will be removed and taken into state custody. |
| 38132 | April 3 | Event | 2009 – Jiverly Antares Wong opens fire at an American Civic Association immigration center in Binghamton, New York, killing thirteen and wounding four before committing suicide. |
| 38133 | April 3 | Event | 2010 – Apple Inc. released the first generation iPad, a tablet computer. |
| 38134 | April 3 | Event | 2013 – More than 50 people die in floods resulting from record-breaking rainfall in La Plata and Buenos Aires, Argentina. |
| 38135 | April 3 | Birth | 1529 – Michael Neander, German mathematician and astronomer (d. 1581) |
| 38136 | April 3 | Birth | 1593 – George Herbert, Welsh-English priest and poet (d. 1633) |
| 38137 | April 3 | Birth | 1639 – Alessandro Stradella, Italian composer (d. 1682) |
| 38138 | April 3 | Birth | 1643 – Charles V, Duke of Lorraine (d. 1690) |
| 38139 | April 3 | Birth | 1682 – Valentin Rathgeber, German organist and composer (d. 1750) |
| 38140 | April 3 | Birth | 1693 – George Edwards, English ornithologist and entomologist (d. 1773) |
| 38141 | April 3 | Birth | 1715 – William Watson, English physician, physicist, and botanist (d. 1787) |
| 38142 | April 3 | Birth | 1764 – John Abernethy, English surgeon and anatomist (d. 1831) |
| 38143 | April 3 | Birth | 1769 – Christian Günther von Bernstorff, Danish-Prussian politician and diplomat (d. 1835) |
| 38144 | April 3 | Birth | 1770 – Theodoros Kolokotronis, Greek general (d. 1843) |
| 38145 | April 3 | Birth | 1781 – Swaminarayan, Indian religious leader (d. 1830) |
| 38146 | April 3 | Birth | 1782 – Alexander Macomb, American general (d. 1841) |
| 38147 | April 3 | Birth | 1798 – Charles Wilkes, American admiral, geographer, and explorer (d.1877) |
| 38148 | April 3 | Birth | 1783 – Washington Irving, American historian and author (d. 1859) |
| 38149 | April 3 | Birth | 1806 – Ivan Kireyevsky, Russian philosopher and critic (d. 1856) |
| 38150 | April 3 | Birth | 1807 – Jane Digby, English wife of Edward Law, 1st Earl of Ellenborough (d. 1881) |
| 38151 | April 3 | Birth | 1814 – Lorenzo Snow, American religious leader, 5th President of The Church of Jesus Christ of Latter-day Saints (d. 1901) |
| 38152 | April 3 | Birth | 1821 – Pelham Dale, English priest (d. 1892) |
| 38153 | April 3 | Birth | 1822 – Edward Everett Hale, American minister, historian, and author (d. 1909) |
| 38154 | April 3 | Birth | 1823 – George Derby, American lieutenant and journalist (d. 1861) |
| 38155 | April 3 | Birth | 1823 – William M. Tweed, American politician (d. 1878) |
| 38156 | April 3 | Birth | 1826 – Cyrus K. Holliday, American businessman (d. 1900) |
| 38157 | April 3 | Birth | 1837 – John Burroughs, American botanist and author (d. 1921) |
| 38158 | April 3 | Birth | 1842 – Ulric Dahlgren, American colonel (d. 1864) |
| 38159 | April 3 | Birth | 1848 – Arturo Prat, Chilean lawyer and captain (d. 1879) |
| 38160 | April 3 | Birth | 1858 – Jacob Gaudaur, Canadian rower (d. 1937) |