| 43711 | April 15 | Death | 2015 – Jonathan Crombie, Canadian-American actor and screenwriter (b. 1966) |
| 43712 | April 15 | Death | 2015 – Barbara Strauch, American journalist and author (b. 1951) |
| 43713 | April 15 | Death | 2015 – Surya Bahadur Thapa, Nepalese politician, 24th Prime Minister of Nepal (b. 1928) |
| 43714 | April 15 | Holiday and observance | Christian feast day:Abbo II of MetzFather Damien Day (Hawaii)HunnaMarianne Cope (Episcopal Church (United States))Paternus of AvranchesApril 15 (Eastern Orthodox liturgics) |
| 43715 | April 15 | Holiday and observance | Earliest day on which Sechseläuten can fall, while April 21 is the latest celebrated on the third Monday in April. (Zürich) |
| 43716 | April 15 | Holiday and observance | Fordicidia (Roman Empire) |
| 43717 | April 15 | Holiday and observance | Hillsborough Disaster Memorial (Anfield at Liverpool) |
| 43718 | April 15 | Holiday and observance | Jackie Robinson Day (Major League Baseball) |
| 43719 | April 15 | Holiday and observance | Kim Il-sung’s Birthday (North Korea) |
| 43720 | April 15 | Holiday and observance | Latest day on which New Year festivals in South and Southeast Asian cultures can fall. (see April 14) |
| 43721 | April 15 | Holiday and observance | Tax Day, the official deadline for filing an individual tax return (or requesting an extension). (United States, Philippines) |
| 43722 | April 15 | Holiday and observance | Universal Day of Culture (International) |
| 43723 | April 15 | Holiday and observance | World Art Day (International) |
| 43724 | April 16 | Event | 1457 BC – Likely date of the Battle of Megiddo between Thutmose III and a large Canaanite coalition under the King of Kadesh, the first battle to have been recorded in what is accepted as relatively reliable detail. |
| 43725 | April 16 | Event | 73 – Masada, a Jewish fortress, falls to the Romans after several months of siege, ending the Great Jewish Revolt. |
| 43726 | April 16 | Event | 1346 – Dušan the Mighty is proclaimed Emperor, with the Serbian Empire occupying much of the Balkans. |
| 43727 | April 16 | Event | 1520 – The Revolt of the Comuneros begins in Spain against the rule of Charles V. |
| 43728 | April 16 | Event | 1521 – Protestant Reformation: Martin Luther's first appearance before the Diet of Worms to be examined by the Holy Roman Emperor Charles V and the other estates of the empire. |
| 43729 | April 16 | Event | 1582 – Spanish conquistador Hernando de Lerma founds the settlement of Salta, Argentina. |
| 43730 | April 16 | Event | 1746 – The Battle of Culloden is fought between the French-supported Jacobites and the British Hanoverian forces commanded by William Augustus, Duke of Cumberland, in Scotland. After the battle many highland traditions were banned and the Highlands of Sco |
| 43731 | April 16 | Event | 1780 – The University of Münster in Münster, North Rhine-Westphalia, Germany is founded. |
| 43732 | April 16 | Event | 1799 – Napoleonic Wars: The Battle of Mount Tabor: Napoleon drives Ottoman Turks across the River Jordan near Acre. |
| 43733 | April 16 | Event | 1818 – The United States Senate ratifies the Rush–Bagot Treaty, establishing the border with Canada. |
| 43734 | April 16 | Event | 1847 – The accidental shooting of a Māori by an English sailor results in the opening of the Wanganui Campaign of the New Zealand land wars. |
| 43735 | April 16 | Event | 1853 – The first passenger rail opens in India, from Bori Bunder, Bombay to Thane. |
| 43736 | April 16 | Event | 1858 – The Wernerian Natural History Society, a former Scottish learned society, is wound up. |
| 43737 | April 16 | Event | 1862 – American Civil War: Battle at Lee's Mills in Virginia. |
| 43738 | April 16 | Event | 1862 – American Civil War: The District of Columbia Compensated Emancipation Act, a bill ending slavery in the District of Columbia, becomes law. |
| 43739 | April 16 | Event | 1863 – American Civil War: Siege of Vicksburg: Ships led by Union Admiral David Dixon Porter move through heavy Confederate artillery fire on approach to Vicksburg, Mississippi. |
| 43740 | April 16 | Event | 1881 – In Dodge City, Kansas, Bat Masterson fights his last gun battle. |