| 80251 | July 15 | Event | 2002 – "American Taliban" John Walker Lindh pleads guilty to supplying aid to the enemy and to possession of explosives during the commission of a felony. |
| 80252 | July 15 | Event | 2002 – Anti-Terrorism Court of Pakistan hands down the death sentence to British born Ahmed Omar Saeed Sheikh and life terms to three others suspected of murdering The Wall Street Journal reporter Daniel Pearl. |
| 80253 | July 15 | Event | 2003 – AOL Time Warner disbands Netscape. The Mozilla Foundation is established on the same day. |
| 80254 | July 15 | Event | 2006 – Twitter is launched, becoming one of the largest social media platforms in the world. |
| 80255 | July 15 | Event | 2014 – A train derails on the Moscow Metro, killing at least 24 and injuring more than 160 others. |
| 80256 | July 15 | Birth | 1273 – Ewostatewos, Ethiopian monk and saint (d. 1352) |
| 80257 | July 15 | Birth | 1353 – Vladimir the Bold, Russian prince (d. 1410) |
| 80258 | July 15 | Birth | 1471 – Eskender, Ethiopian emperor (d. 1494) |
| 80259 | July 15 | Birth | 1553 – Archduke Ernest of Austria (d. 1595) |
| 80260 | July 15 | Birth | 1573 – Inigo Jones, English architect, designed the Queen's House (d. 1652) |
| 80261 | July 15 | Birth | 1613 – Gu Yanwu, Chinese philologist and geographer (d. 1682) |
| 80262 | July 15 | Birth | 1606 – Rembrandt, Dutch painter and etcher (d. 1669) |
| 80263 | July 15 | Birth | 1626 – Christiane Sehested, Danish daughter of Christian IV of Denmark (d. 1670) |
| 80264 | July 15 | Birth | 1626 – Hedevig Ulfeldt, Danish daughter of Christian IV of Denmark (d. 1678) |
| 80265 | July 15 | Birth | 1631 – Jens Juel, Danish politician and diplomat, Governor-general of Norway (d. 1700) |
| 80266 | July 15 | Birth | 1638 – Giovanni Buonaventura Viviani, Italian violinist and composer (d. 1693) |
| 80267 | July 15 | Birth | 1704 – August Gottlieb Spangenberg, German bishop and theologian (d. 1792) |
| 80268 | July 15 | Birth | 1737 – Princess Louise of France (d. 1787) |
| 80269 | July 15 | Birth | 1779 – Clement Clarke Moore, American author, poet, and educator (d. 1863) |
| 80270 | July 15 | Birth | 1796 – Thomas Bulfinch, American banker and author (d. 1867) |
| 80271 | July 15 | Birth | 1799 – Reuben Chapman, American lawyer and politician, 13th Governor of Alabama (d. 1882) |
| 80272 | July 15 | Birth | 1800 – Sidney Breese, American jurist and politician (d. 1878) |
| 80273 | July 15 | Birth | 1808 – Henry Edward Manning, English cardinal (d. 1892) |
| 80274 | July 15 | Birth | 1812 – James Hope-Scott, English lawyer and academic (d. 1873) |
| 80275 | July 15 | Birth | 1817 – Sir John Fowler, 1st Baronet, English engineer, designed the Forth Bridge (d. 1898) |
| 80276 | July 15 | Birth | 1827 – W. W. Thayer American lawyer and politician, 6th Governor of Oregon (d. 1899) |
| 80277 | July 15 | Birth | 1837 – Stephanie of Hohenzollern-Sigmaringen (d. 1859) |
| 80278 | July 15 | Birth | 1848 – Vilfredo Pareto, Italian economist and sociologist (d. 1923) |
| 80279 | July 15 | Birth | 1850 – Francesca S. Cabrini, Italian-American nun and saint (d. 1917) |
| 80280 | July 15 | Birth | 1858 – Emmeline Pankhurst, English activist (d. 1928) |