| 93811 | August 18 | Birth | 2003 – Max Charles, American actor |
| 93812 | August 18 | Death | 353 – Decentius, Roman usurper |
| 93813 | August 18 | Death | 440 – Pope Sixtus III |
| 93814 | August 18 | Death | 472 – Ricimer, Roman general and politician (b. 405) |
| 93815 | August 18 | Death | 673 – Gim Yu-sin, Korean general (b. 595) |
| 93816 | August 18 | Death | 849 – Walafrid Strabo, German monk and theologian (b. 808) |
| 93817 | August 18 | Death | 1227 – Genghis Khan, Mongolian emperor (b. 1162) |
| 93818 | August 18 | Death | 1276 – Pope Adrian V (b. 1220) |
| 93819 | August 18 | Death | 1318 – Clare of Montefalco, Italian nun and saint (b. 1268) |
| 93820 | August 18 | Death | 1430 – Thomas de Ros, 8th Baron de Ros, English soldier and politician (b. 1406) |
| 93821 | August 18 | Death | 1503 – Pope Alexander VI (b. 1431) |
| 93822 | August 18 | Death | 1550 – Antonio Ferramolino, Italian architect and military engineer |
| 93823 | August 18 | Death | 1559 – Pope Paul IV (b. 1476) |
| 93824 | August 18 | Death | 1563 – Étienne de La Boétie, French judge and philosopher (b. 1530) |
| 93825 | August 18 | Death | 1613 – Giovanni Artusi, Italian composer and theorist (b. 1540) |
| 93826 | August 18 | Death | 1620 – Wanli Emperor of China (b. 1563) |
| 93827 | August 18 | Death | 1634 – Urbain Grandier, French priest (b. 1590) |
| 93828 | August 18 | Death | 1642 – Guido Reni, Italian painter and educator (b. 1575) |
| 93829 | August 18 | Death | 1645 – Eudoxia Streshneva, Russian wife of Michael I of Russia (b. 1608) |
| 93830 | August 18 | Death | 1648 – Ibrahim of the Ottoman Empire (b. 1615) |
| 93831 | August 18 | Death | 1683 – Charles Hart, English actor (b. 1625) |
| 93832 | August 18 | Death | 1707 – William Cavendish, 1st Duke of Devonshire, English soldier and politician, Lord Lieutenant of Derbyshire (b. 1640) |
| 93833 | August 18 | Death | 1712 – Richard Savage, 4th Earl Rivers, English general and politician, Lord Lieutenant of Essex (b. 1660) |
| 93834 | August 18 | Death | 1765 – Francis I, Holy Roman Emperor (b. 1708) |
| 93835 | August 18 | Death | 1809 – Matthew Boulton, English businessman and engineer, co-founded Boulton and Watt (b. 1728) |
| 93836 | August 18 | Death | 1815 – Chauncey Goodrich, American lawyer and politician, 8th Lieutenant Governor of Connecticut (b. 1759) |
| 93837 | August 18 | Death | 1842 – Louis de Freycinet, French explorer and navigator (b. 1779) |
| 93838 | August 18 | Death | 1850 – Honoré de Balzac, French author and playwright (b. 1799) |
| 93839 | August 18 | Death | 1886 – Eli Whitney Blake, American inventor, invented the Mortise lock (b. 1795) |
| 93840 | August 18 | Death | 1919 – Joseph E. Seagram, Canadian businessman and politician, founded the Seagram Company (b. 1841) |