| 90211 | August 9 | Birth | 2005 – Caylee Anthony, American murder victim (d. 2008) |
| 90212 | August 9 | Death | 117 – Trajan, Roman emperor (b. 53) |
| 90213 | August 9 | Death | 378 – Traianus, Roman general |
| 90214 | August 9 | Death | 378 – Valens, Roman emperor (b. 328) |
| 90215 | August 9 | Death | 803 – Irene of Athens (b. 752) |
| 90216 | August 9 | Death | 833 – Al-Ma'mun, Iraqi caliph (b. 786) |
| 90217 | August 9 | Death | 1048 – Pope Damasus II |
| 90218 | August 9 | Death | 1107 – Emperor Horikawa of Japan (b. 1079) |
| 90219 | August 9 | Death | 1173 – Najm ad-Din Ayyub, Kurdish soldier and politician |
| 90220 | August 9 | Death | 1250 – Eric IV of Denmark (b. 1216) |
| 90221 | August 9 | Death | 1534 – Thomas Cajetan, Italian cardinal and philosopher (b. 1470) |
| 90222 | August 9 | Death | 1580 – Metrophanes III of Constantinople (b. 1520) |
| 90223 | August 9 | Death | 1601 – Michael the Brave, Romanian prince (b. 1558) |
| 90224 | August 9 | Death | 1634 – William Noy, English lawyer and judge (b. 1577) |
| 90225 | August 9 | Death | 1720 – Simon Ockley, English orientalist and academic (b. 1678) |
| 90226 | August 9 | Death | 1744 – James Brydges, 1st Duke of Chandos, English academic and politician, Lord Lieutenant of Radnorshire (b. 1673) |
| 90227 | August 9 | Death | 1816 – Johann August Apel, German jurist and author (b. 1771) |
| 90228 | August 9 | Death | 1861 – Vincent Novello, English composer and publisher (b. 1781) |
| 90229 | August 9 | Death | 1886 – Samuel Ferguson, Irish lawyer and poet (b. 1810) |
| 90230 | August 9 | Death | 1910 – Huo Yuanjia, Chinese martial artist, co-founded the Chin Woo Athletic Association (b. 1868) |
| 90231 | August 9 | Death | 1919 – Ruggero Leoncavallo, Italian composer and educator (b. 1857) |
| 90232 | August 9 | Death | 1932 – John Charles Fields, Canadian mathematician, founder of the Fields Medal (b. 1863) |
| 90233 | August 9 | Death | 1942 – Edith Stein, German nun and saint (b. 1891) |
| 90234 | August 9 | Death | 1943 – Chaim Soutine, Belarusian-French painter and educator (b. 1893) |
| 90235 | August 9 | Death | 1945 – Robert Hampton Gray, Canadian lieutenant and pilot, Victoria Cross recipient (b. 1917) |
| 90236 | August 9 | Death | 1945 – Harry Hillman, American runner and coach (b. 1881) |
| 90237 | August 9 | Death | 1946 – Bert Vogler, South African cricketer (b. 1876) |
| 90238 | August 9 | Death | 1948 – Hugo Boss, German fashion designer, founded Hugo Boss (b. 1885) |
| 90239 | August 9 | Death | 1949 – Edward Thorndike, American psychologist and academic (b. 1874) |
| 90240 | August 9 | Death | 1957 – Carl Clauberg, German physician (b. 1898) |