| 91381 | August 12 | Death | 1674 – Philippe de Champaigne, Belgian-French painter and educator (b. 1602) |
| 91382 | August 12 | Death | 1689 – Pope Innocent XI (b. 1611) |
| 91383 | August 12 | Death | 1778 – Peregrine Bertie, 3rd Duke of Ancaster and Kesteven, English general and politician, Lord Lieutenant of Lincolnshire (b. 1714) |
| 91384 | August 12 | Death | 1809 – Mikhail Kamensky, Russian field marshal (b. 1738) |
| 91385 | August 12 | Death | 1810 – Étienne Louis Geoffroy, French pharmacist and entomologist (b. 1725) |
| 91386 | August 12 | Death | 1822 – Robert Stewart, Viscount Castlereagh, Irish-English politician, Secretary of State for Foreign Affairs (b. 1769) |
| 91387 | August 12 | Death | 1827 – William Blake, English poet and painter (b. 1757) |
| 91388 | August 12 | Death | 1829 – Charles Sapinaud de La Rairie, French general (b. 1760) |
| 91389 | August 12 | Death | 1848 – George Stephenson, English engineer and academic (b. 1781) |
| 91390 | August 12 | Death | 1849 – Albert Gallatin, Swiss-American ethnologist, linguist, and politician, 4th United States Secretary of the Treasury (b. 1761) |
| 91391 | August 12 | Death | 1851 – John Elliot Drinkwater Bethune, English-Indian lawyer and activist (b. 1801) |
| 91392 | August 12 | Death | 1861 – Eliphalet Remington, American inventor and businessman, founded Remington Arms (b. 1793) |
| 91393 | August 12 | Death | 1864 – Sakuma Shōzan, Japanese scholar and politician (b. 1811) |
| 91394 | August 12 | Death | 1865 – William Jackson Hooker, English botanist and academic (b. 1785) |
| 91395 | August 12 | Death | 1891 – James Russell Lowell, American poet and critic (b. 1819) |
| 91396 | August 12 | Death | 1896 – Thomas Chamberlain, American colonel (b. 1841) |
| 91397 | August 12 | Death | 1900 – Wilhelm Steinitz, Austrian chess player and theoretician (b. 1836) |
| 91398 | August 12 | Death | 1901 – Adolf Erik Nordenskiöld, Finnish-Swedish botanist, geologist, mineralogist, and explorer (b. 1832) |
| 91399 | August 12 | Death | 1904 – William Renshaw, English tennis player (b. 1861) |
| 91400 | August 12 | Death | 1914 – John Philip Holland, Irish engineer, designed the HMS Holland 1 (b. 1840) |
| 91401 | August 12 | Death | 1918 – Anna Held, Polish-American actress and singer (b. 1872) |
| 91402 | August 12 | Death | 1918 – William Thompson, American archer (b. 1848) |
| 91403 | August 12 | Death | 1921 – Pyotr Boborykin, Russian playwright and journalist (b. 1836) |
| 91404 | August 12 | Death | 1922 – Arthur Griffith, Irish journalist and politician, 3rd President of Dáil Éireann (b. 1871) |
| 91405 | August 12 | Death | 1924 – Sándor Bródy, Hungarian journalist and author (b. 1863) |
| 91406 | August 12 | Death | 1928 – Leoš Janáček, Czech composer and educator (b. 1854) |
| 91407 | August 12 | Death | 1934 – Hendrik Petrus Berlage, Dutch architect, designed the Beurs van Berlage (b. 1856) |
| 91408 | August 12 | Death | 1935 – Friedrich Schottky, German mathematician and academic (b. 1851) |
| 91409 | August 12 | Death | 1940 – Nikolai Triik, Estonian painter, illustrator, and academic (b. 1884) |
| 91410 | August 12 | Death | 1941 – Freeman Freeman-Thomas, 1st Marquess of Willingdon, English soldier and politician, 56th Governor General of Canada (b. 1866) |