| 60601 | May.26 | Death | 2015 – Dayton Waller, American soldier and politician (b. 1925) |
| 60602 | May.26 | Holiday and observance | Christian feast day:Augustine of Canterbury (Anglican Communion and Eastern Orthodox)Lambert of VencePeter Sanz (one of Martyr Saints of China)Philip NeriPope EleuterusQuadratus of AthensZachary, Bishop of VienneMay 26 (Eastern Orthodox liturgics) |
| 60603 | May.26 | Holiday and observance | Crown Prince's Birthday (Denmark) |
| 60604 | May.26 | Holiday and observance | Independence Day, commemorates the day of the First Republic in 1918 (Georgia) |
| 60605 | May.26 | Holiday and observance | Independence Day, celebrates the independence of Guyana from the United Kingdom in 1966. |
| 60606 | May.26 | Holiday and observance | Mother's Day (Poland) |
| 60607 | May.26 | Holiday and observance | National Day of Healing (Australia) |
| 60608 | May.26 | Holiday and observance | National Paper Airplane Day (United States) |
| 60609 | May.27 | Event | 927 – Death of Simeon I the Great, the first Bulgarian to be recognized as Emperor. |
| 60610 | May.27 | Event | 1120 – Richard III of Capua is anointed as Prince two weeks before his untimely death. |
| 60611 | May.27 | Event | 1153 – Malcolm IV becomes King of Scotland. |
| 60612 | May.27 | Event | 1199 – John is crowned King of England. |
| 60613 | May.27 | Event | 1644 – Manchu regent Dorgon defeats rebel leader Li Zicheng of the Shun dynasty at the Battle of Shanhai Pass, allowing the Manchus to enter and conquer the capital city of Beijing. |
| 60614 | May.27 | Event | 1703 – Tsar Peter the Great founds the city of Saint Petersburg. |
| 60615 | May.27 | Event | 1798 – The Battle of Oulart Hill takes place in Wexford, Ireland. |
| 60616 | May.27 | Event | 1799 – War of the Second Coalition: Austrian forces defeats the French at Winterthur, Switzerland, securing control of the northeastern Swiss Plateau because of the town's location at the junction of seven cross-roads. |
| 60617 | May.27 | Event | 1813 – War of 1812: In Canada, American forces capture Fort George. |
| 60618 | May.27 | Event | 1849 – The Great Hall of Euston station in London is opened. |
| 60619 | May.27 | Event | 1860 – Giuseppe Garibaldi begins his attack on Palermo, Sicily, as part of the Italian unification. |
| 60620 | May.27 | Event | 1863 – American Civil War: First Assault on the Confederate works at the Siege of Port Hudson. |
| 60621 | May.27 | Event | 1874 – The first group of Dorsland trekkers under the leadership of Gert Alberts leaves Pretoria. |
| 60622 | May.27 | Event | 1883 – Alexander III is crowned Tsar of Russia. |
| 60623 | May.27 | Event | 1896 – The F4-strength 1896 St. Louis–East St. Louis tornado hits in St. Louis, Missouri, and East St. Louis, Illinois, killing at least 255 people and causing $2.9 billion in damage (1997 US dollars). |
| 60624 | May.27 | Event | 1905 – Russo-Japanese War: The Battle of Tsushima begins. |
| 60625 | May.27 | Event | 1907 – Bubonic plague breaks out in San Francisco. |
| 60626 | May.27 | Event | 1908 – Khilafat Day – the day of establishment of Khilafat in Islam Ahmadiyya. |
| 60627 | May.27 | Event | 1919 – The NC-4 aircraft arrives in Lisbon after completing the first transatlantic flight. |
| 60628 | May.27 | Event | 1927 – The Ford Motor Company ceases manufacture of the Ford Model T and begins to retool plants to make the Ford Model A. |
| 60629 | May.27 | Event | 1930 – The 1,046 feet (319 m) Chrysler Building in New York City, the tallest man-made structure at the time, opens to the public. |
| 60630 | May.27 | Event | 1933 – New Deal: The U.S. Federal Securities Act is signed into law requiring the registration of securities with the Federal Trade Commission. |