| 97231 | August 27 | Event | 1689 – The Treaty of Nerchinsk is signed by Russia and the Qing Empire (Julian calendar). |
| 97232 | August 27 | Event | 1776 – Battle of Long Island: In what is now Brooklyn, New York, British forces under General William Howe defeat Americans under General George Washington. |
| 97233 | August 27 | Event | 1793 – French Revolutionary Wars: The city of Toulon revolts against the French Republic and admits the British and Spanish fleets to seize its port, leading to the Siege of Toulon by French Revolutionary forces. |
| 97234 | August 27 | Event | 1798 – Wolfe Tone's United Irish and French forces clash with the British Army in the Battle of Castlebar, part of the Irish Rebellion of 1798, resulting in the creation of the French puppet Republic of Connacht. |
| 97235 | August 27 | Event | 1810 – Napoleonic Wars: The French Navy defeats the British Royal Navy, preventing them from taking the harbour of Grand Port on Île de France. |
| 97236 | August 27 | Event | 1813 – French Emperor Napoleon I defeats a larger force of Austrians, Russians, and Prussians at the Battle of Dresden. |
| 97237 | August 27 | Event | 1828 – Uruguay is formally proclaimed independent at preliminary peace talks brokered by the United Kingdom between Brazil and Argentina during the Cisplatine War. |
| 97238 | August 27 | Event | 1832 – Black Hawk, leader of the Sauk tribe of Native Americans, surrenders to U.S. authorities, ending the Black Hawk War. |
| 97239 | August 27 | Event | 1859 – Petroleum is discovered in Titusville, Pennsylvania leading to the world's first commercially successful oil well. |
| 97240 | August 27 | Event | 1883 – Eruption of Krakatoa: Four enormous explosions destroy the island of Krakatoa and cause years of climate change. |
| 97241 | August 27 | Event | 1896 – Anglo-Zanzibar War: The shortest war in world history (09:00 to 09:45), between the United Kingdom and Zanzibar. |
| 97242 | August 27 | Event | 1914 – Battle of Étreux: A British rearguard action by the Royal Munster Fusiliers during the Great Retreat. |
| 97243 | August 27 | Event | 1916 – The Kingdom of Romania declares war on Austria-Hungary, entering World War I as one of the Allied nations. |
| 97244 | August 27 | Event | 1918 – Mexican Revolution: Battle of Ambos Nogales: U.S. Army forces skirmish against Mexican Carrancistas and their German advisors in the only battle of World War I fought on American soil. |
| 97245 | August 27 | Event | 1921 – The British install the son of Sharif Hussein bin Ali (leader of the Arab Revolt of 1916 against the Ottoman Empire) as King Faisal I of Iraq. |
| 97246 | August 27 | Event | 1922 – Greco-Turkish War: The Turkish army takes the Aegean city of Afyonkarahisar from the Kingdom of Greece. |
| 97247 | August 27 | Event | 1927 – Five Canadian women file a petition to the Supreme Court of Canada, asking, "Does the word 'Persons' in Section 24 of the British North America Act, 1867, include female persons?" |
| 97248 | August 27 | Event | 1928 – The Kellogg–Briand Pact outlawing war is signed by fifteen nations. Ultimately sixty-one nations will sign it. |
| 97249 | August 27 | Event | 1933 – The first Afrikaans Bible is introduced during a Bible Festival in Bloemfontein. |
| 97250 | August 27 | Event | 1939 – First flight of the turbojet-powered Heinkel He 178, the world's first jet aircraft. |
| 97251 | August 27 | Event | 1943 – World War II: Japanese forces evacuate New Georgia Island in the Pacific Theater of Operations during World War II. |
| 97252 | August 27 | Event | 1957 – Malaysia's constitution comes into force. |
| 97253 | August 27 | Event | 1962 – The Mariner 2 unmanned space mission is launched to Venus by NASA. |
| 97254 | August 27 | Event | 1964 – South Vietnamese junta leader Nguyễn Khánh enters into a triumvirate power-sharing arrangement with rival generals Trần Thiện Khiêm and Dương Văn Minh, who had both been involved in plots to unseat Khánh. |
| 97255 | August 27 | Event | 1971 – An attempted coup d'état fails in the African nation of Chad. The Government of Chad accuses Egypt of playing a role in the attempt and breaks off diplomatic relations. |
| 97256 | August 27 | Event | 1975 – The Governor of Portuguese Timor abandons its capital, Dili, and flees to Atauro Island, leaving control to a rebel group. |
| 97257 | August 27 | Event | 1979 – A Provisional Irish Republican Army bomb kills British retired admiral Lord Mountbatten and three others while they are boating on holiday in Sligo, Republic of Ireland. Shortly after, 18 British Army soldiers are killed in an ambush near Warrenpoi |
| 97258 | August 27 | Event | 1982 – Turkish military diplomat Colonel Atilla Altıkat is shot and killed in Ottawa, Canada's capital city. Justice Commandos of the Armenian Genocide claim responsibility, saying they are avenging the massacre of 1.5 million Armenians in the 1915 Armeni |
| 97259 | August 27 | Event | 1985 – The Nigerian government is peacefully overthrown by Army Chief of Staff Major General Ibrahim Babangida. |
| 97260 | August 27 | Event | 1991 – The European Community recognizes the independence of the Baltic states of Estonia, Latvia and Lithuania. |