| 72871 | June 26 | Event | 1541 – Francisco Pizarro is assassinated in Lima by the son of his former companion and later antagonist, Diego de Almagro the younger. Almagro is later caught and executed. |
| 72872 | June 26 | Event | 1579 – Livonian campaign of Stephen Báthory begins. |
| 72873 | June 26 | Event | 1718 – Alexei Petrovich, Tsarevich of Russia, Peter the Great's son, mysteriously dies after being sentenced to death by his father for plotting against him. |
| 72874 | June 26 | Event | 1723 – After a siege and bombardment by cannon, Baku surrenders to the Russians. |
| 72875 | June 26 | Event | 1740 – A combined force Spanish, free blacks and allied Indians defeat a British garrison at the Siege of Fort Mose near St. Augustine during the War of Jenkins' Ear. |
| 72876 | June 26 | Event | 1794 – French Revolutionary Wars: Battle of Fleurus marked the first successful military use of aircraft. |
| 72877 | June 26 | Event | 1830 – William IV becomes king of Britain and Hanover. |
| 72878 | June 26 | Event | 1843 – Treaty of Nanking comes into effect, Hong Kong Island is ceded to the British "in perpetuity". |
| 72879 | June 26 | Event | 1848 – End of the June Days Uprising in Paris. |
| 72880 | June 26 | Event | 1857 – The first investiture of the Victoria Cross in Hyde Park, London. |
| 72881 | June 26 | Event | 1870 – The Christian holiday of Christmas is declared a federal holiday in the United States. |
| 72882 | June 26 | Event | 1886 – Henri Moissan isolated elemental Fluorine for the first time. |
| 72883 | June 26 | Event | 1889 – Bangui is founded by Albert Dolisie and Alfred Uzac in what was then the upper reaches of the French Congo. |
| 72884 | June 26 | Event | 1906 – The first Grand Prix motor racing event held. |
| 72885 | June 26 | Event | 1907 – The 1907 Tiflis bank robbery takes place in Yerevan Square, now Freedom Square, Tbilisi. |
| 72886 | June 26 | Event | 1909 – The Science Museum in London comes into existence as an independent entity. |
| 72887 | June 26 | Event | 1917 – The first U.S. troops arrive in France to fight alongside Britain and France against Germany in World War I. |
| 72888 | June 26 | Event | 1918 – World War I: Western Front: Battle of Belleau Wood: Allied Forces under John J. Pershing and James Harbord defeat Imperial German Forces under Wilhelm, German Crown Prince. |
| 72889 | June 26 | Event | 1924 – American occupying forces leave the Dominican Republic. |
| 72890 | June 26 | Event | 1927 – The Cyclone roller coaster opens on Coney Island. |
| 72891 | June 26 | Event | 1934 – United States President Franklin D. Roosevelt signs the Federal Credit Union Act, which establishes credit unions. |
| 72892 | June 26 | Event | 1936 – Initial flight of the Focke-Wulf Fw 61, the first practical helicopter. |
| 72893 | June 26 | Event | 1940 – World War II: Under the Molotov–Ribbentrop Pact, the Soviet Union presents an ultimatum to Romania requiring it to cede Bessarabia and the northern part of Bukovina. |
| 72894 | June 26 | Event | 1941 – World War II: Soviet planes bomb Kassa, Hungary (now Košice, Slovakia), giving Hungary the impetus to declare war the next day. |
| 72895 | June 26 | Event | 1942 – The first flight of the Grumman F6F Hellcat. |
| 72896 | June 26 | Event | 1944 – World War II: The Battle of Osuchy in Osuchy, Poland, one of the largest battles between Nazi Germany and Polish resistance forces, ends with the defeat of the latter. |
| 72897 | June 26 | Event | 1945 – The United Nations Charter is signed in San Francisco. |
| 72898 | June 26 | Event | 1948 – The Western allies begin an airlift to Berlin after the Soviet Union blockades West Berlin. |
| 72899 | June 26 | Event | 1948 – William Shockley files the original patent for the grown-junction transistor, the first bipolar junction transistor. |
| 72900 | June 26 | Event | 1948 – Shirley Jackson's short story The Lottery is published in The New Yorker magazine. |