| 96451 | August 25 | Event | 766 – Emperor Constantine V humiliates nineteen high-ranking officials, after discovering a plot against him. He executes the leaders, Constantine Podopagouros and his brother Strategios. |
| 96452 | August 25 | Event | 1248 – The Dutch city of Ommen receives city rights and fortification rights from Otto III, the Archbishop of Utrecht. |
| 96453 | August 25 | Event | 1258 – Regent George Mouzalon and his brothers are killed during a coup headed by the aristocratic faction under, paving the way for its leader, Michael VIII Palaiologos, to ultimately usurp the throne of the Empire of Nicaea. |
| 96454 | August 25 | Event | 1537 – The Honourable Artillery Company, the oldest surviving regiment in the British Army, and the second most senior, is formed. |
| 96455 | August 25 | Event | 1580 – Battle of Alcântara. Spain defeats Portugal. |
| 96456 | August 25 | Event | 1609 – Galileo Galilei demonstrates his first telescope to Venetian lawmakers. |
| 96457 | August 25 | Event | 1630 – Portuguese forces are defeated by the Kingdom of Kandy at the Battle of Randeniwela in Sri Lanka. |
| 96458 | August 25 | Event | 1758 – Seven Years' War: Frederick II of Prussia defeats the Russian army at the Battle of Zorndorf. |
| 96459 | August 25 | Event | 1768 – James Cook begins his first voyage. |
| 96460 | August 25 | Event | 1825 – Uruguay declares its independence from Brazil. |
| 96461 | August 25 | Event | 1830 – The Belgian Revolution begins. |
| 96462 | August 25 | Event | 1835 – The New York Sun perpetrates the Great Moon Hoax. |
| 96463 | August 25 | Event | 1875 – Captain Matthew Webb became the first person to swim across the English Channel, traveling from Dover, England, to Calais, France, in 22 hours. |
| 96464 | August 25 | Event | 1883 – France and Viet Nam sign the Treaty of Huế, recognizing a French protectorate over Annam and Tonkin. |
| 96465 | August 25 | Event | 1894 – Kitasato Shibasaburō discovers the infectious agent of the bubonic plague and publishes his findings in The Lancet. |
| 96466 | August 25 | Event | 1898 – Seven hundred Greek civilians, 17 British guards and the British Consul of Crete are killed by a Turkish mob in Heraklion, Greece. |
| 96467 | August 25 | Event | 1912 – The Kuomintang, the Chinese nationalist party, is founded. |
| 96468 | August 25 | Event | 1914 – World War I: The library of the Catholic University of Leuven is deliberately destroyed by the German Army. Hundreds of thousands of irreplaceable volumes and Gothic and Renaissance manuscripts are lost. |
| 96469 | August 25 | Event | 1916 – The United States National Park Service is created. |
| 96470 | August 25 | Event | 1920 – Polish–Soviet War: Battle of Warsaw, which began on August 13, ends with the Red Army's defeat. |
| 96471 | August 25 | Event | 1921 – The first skirmishes of the Battle of Blair Mountain occur. |
| 96472 | August 25 | Event | 1933 – The Diexi earthquake strikes Mao County, Sichuan, China and kills 9,000 people. |
| 96473 | August 25 | Event | 1939 – The United Kingdom and Poland form a military alliance in which the UK promises to defend Poland in case of invasion by a foreign power. |
| 96474 | August 25 | Event | 1942 – World War II: Battle of Milne Bay, Papua New Guinea. |
| 96475 | August 25 | Event | 1942 – World War II: second day of the Battle of the Eastern Solomons. A Japanese naval transport convoy headed towards Guadalcanal is turned-back by an Allied air attack, losing one destroyer and one transport sunk, and one light cruiser heavily damaged. |
| 96476 | August 25 | Event | 1944 – World War II: Paris is liberated by the Allies. |
| 96477 | August 25 | Event | 1945 – Ten days after World War II ends with Japan announcing its surrender, armed supporters of the Chinese Communist Party kill U.S. intelligence officer John Birch, regarded by some of the American right as the first victim of the Cold War. |
| 96478 | August 25 | Event | 1948 – The House Un-American Activities Committee holds first-ever televised congressional hearing: "Confrontation Day" between Whittaker Chambers and Alger Hiss. |
| 96479 | August 25 | Event | 1950 – President Harry Truman orders the U.S. Army to seize control of the nation's railroads to avert a strike. |
| 96480 | August 25 | Event | 1961 – President Jânio Quadros of Brazil resigns after just seven months in power, initiating a political crisis that culminates in a military coup in 1964. |