| 81421 | July 18 | Event | 1984 – The dismembered body of Swedish prostitute Catrine da Costa is found in Stockholm, the findings later led to a trial that ended in a mistrial for two accused doctors. |
| 81422 | July 18 | Event | 1986 – A tornado is broadcast live on KARE television in Minnesota when the station's helicopter pilot makes a chance encounter. |
| 81423 | July 18 | Event | 1992 – The ten victims of the La Cantuta massacre disappear from their university in Lima. |
| 81424 | July 18 | Event | 1994 – The bombing of the Asociación Mutual Israelita Argentina (Argentine Jewish Community Center) in Buenos Aires kills 85 people (mostly Jewish) and injures 300. |
| 81425 | July 18 | Event | 1994 – Rwandan Genocide: The Rwandan Patriotic Front takes control of Gisenyi and north western Rwanda, forcing the interim government into Zaire and ending the genocide. |
| 81426 | July 18 | Event | 1995 – On the Caribbean island of Montserrat, the Soufrière Hills volcano erupts. Over the course of several years, it devastates the island, destroying the capital and forcing most of the population to flee. |
| 81427 | July 18 | Event | 1995 – Dreaming of You by Selena, released posthumously, became the best-selling Latin album in the United States. It was noted by Billboard magazine as a "historic event" for Latin music. |
| 81428 | July 18 | Event | 1996 – Storms provoke severe flooding on the Saguenay River, beginning one of Quebec's costliest natural disasters ever: The Saguenay Flood. |
| 81429 | July 18 | Event | 1996 – Battle of Mullaitivu: The Liberation Tigers of Tamil Eelam capture the Sri Lanka Army's base, killing over 1200 soldiers. |
| 81430 | July 18 | Event | 2012 – At least seven people are killed and 32 others are injured after a bomb explodes on an Israeli tour bus at Burgas Airport, Bulgaria. |
| 81431 | July 18 | Event | 2013 – The Government of Detroit, with up to $20 billion in debt, files for the largest municipal bankruptcy in U.S. history. |
| 81432 | July 18 | Birth | 1439 – John V, Duke of Saxe-Lauenburg (d. 1507) |
| 81433 | July 18 | Birth | 1501 – Isabella of Austria (d. 1526) |
| 81434 | July 18 | Birth | 1504 – Heinrich Bullinger, Swiss pastor and reformer (d. 1575) |
| 81435 | July 18 | Birth | 1552 – Rudolf II, Holy Roman Emperor (d. 1612) |
| 81436 | July 18 | Birth | 1634 – Johannes Camphuys, Dutch politician, Governor-General of the Dutch East Indies (d. 1695) |
| 81437 | July 18 | Birth | 1659 – Hyacinthe Rigaud, French painter (d. 1743) |
| 81438 | July 18 | Birth | 1670 – Giovanni Bononcini, Italian cellist and composer (d. 1747) |
| 81439 | July 18 | Birth | 1718 – Saverio Bettinelli, Italian poet, playwright, and critic (d. 1808) |
| 81440 | July 18 | Birth | 1720 – Gilbert White, English ornithologist and ecologist (d. 1793) |
| 81441 | July 18 | Birth | 1724 – Duchess Maria Antonia of Bavaria (d. 1780) |
| 81442 | July 18 | Birth | 1797 – Immanuel Hermann Fichte, German philosopher and academic (d. 1879) |
| 81443 | July 18 | Birth | 1811 – William Makepeace Thackeray, English author and poet (d. 1863) |
| 81444 | July 18 | Birth | 1818 – Louis Gerhard De Geer, Swedish lawyer and politician, 1st Prime Minister of Sweden (d. 1896) |
| 81445 | July 18 | Birth | 1821 – Pauline Viardot, French soprano and composer (d. 1910) |
| 81446 | July 18 | Birth | 1837 – Vasil Levski, Bulgarian priest and activist (d. 1873) |
| 81447 | July 18 | Birth | 1845 – Tristan Corbière, French poet (d. 1875) |
| 81448 | July 18 | Birth | 1848 – W. G. Grace, English cricketer and physician (d. 1915) |
| 81449 | July 18 | Birth | 1853 – Hendrik Lorentz, Dutch physicist and academic, Nobel Prize laureate (d. 1928) |
| 81450 | July 18 | Birth | 1864 – Philip Snowden, 1st Viscount Snowden, English politician, Chancellor of the Exchequer (d. 1937) |