| 82111 | July 20 | Event | 1960 – Ceylon (now Sri Lanka) elects Sirimavo Bandaranaike Prime Minister, the world's first elected female head of government. |
| 82112 | July 20 | Event | 1960 – The Polaris missile is successfully launched from a submarine, the USS George Washington, for the first time. |
| 82113 | July 20 | Event | 1961 – French military forces break the Tunisian siege of Bizerte. |
| 82114 | July 20 | Event | 1964 – Vietnam War: Viet Cong forces attack the capital of Định Tường Province, Cái Bè, killing 11 South Vietnamese military personnel and 40 civilians (30 of whom are children). |
| 82115 | July 20 | Event | 1968 – The first International Special Olympics Summer Games are held at Soldier Field in Chicago, with about 1,000 athletes with intellectual disabilities. |
| 82116 | July 20 | Event | 1969 – Apollo program: Apollo 11's crew successfully makes the first landing on the Moon in the Sea of Tranquility. Americans Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon later that day (Eastern Time Zone). |
| 82117 | July 20 | Event | 1969 – A cease fire is announced between Honduras and El Salvador, six days after the beginning of the "Football War". |
| 82118 | July 20 | Event | 1974 – Turkish occupation of Cyprus: Forces from Turkey invade Cyprus after a coup d'état, organised by the dictator of Greece, against president Makarios. |
| 82119 | July 20 | Event | 1976 – The American Viking 1 lander successfully lands on Mars. |
| 82120 | July 20 | Event | 1977 – The Central Intelligence Agency releases documents under the Freedom of Information Act revealing it had engaged in mind-control experiments. |
| 82121 | July 20 | Event | 1982 – Hyde Park and Regent's Park bombings: The Provisional IRA detonates two bombs in Hyde Park and Regent's Park in central London, killing eight soldiers, wounding forty-seven people, and leading to the deaths of seven horses. |
| 82122 | July 20 | Event | 1985 – The government of Aruba passes legislation to secede from the Netherlands Antilles. |
| 82123 | July 20 | Event | 1989 – Burma's ruling junta puts opposition leader Daw Aung San Suu Kyi under house arrest. |
| 82124 | July 20 | Event | 1992 – Václav Havel resigns as president of Czechoslovakia. |
| 82125 | July 20 | Event | 1997 – The fully restored USS Constitution (a.k.a. Old Ironsides) celebrates its 200th birthday by setting sail for the first time in 116 years. |
| 82126 | July 20 | Event | 1999 – The Chinese Communist Party begins a persecution campaign against Falun Gong, arresting thousands nationwide. |
| 82127 | July 20 | Event | 2012 – A gunman opens fire at a movie theater in Aurora, Colorado, killing 12 and injuring 70 others. |
| 82128 | July 20 | Event | 2013 – Seventeen government soldiers are killed in an attack by FARC revolutionaries in the Colombian department of Arauca. |
| 82129 | July 20 | Event | 2015 – A huge explosion in the mostly Kurdish border town of Suruç, Turkey, targeting The Socialist Youth Associations Federation, kills at least 31 people and injures over 100. |
| 82130 | July 20 | Event | 2015 – The United States and Cuba resume full diplomatic relations after five decades. |
| 82131 | July 20 | Birth | 356 BC – Alexander the Great, Macedonian king (d. 323 BC) |
| 82132 | July 20 | Birth | 647 – Yazid I, Arabian caliph (d. 683) |
| 82133 | July 20 | Birth | 682 – Taichō, Japanese monk and scholar (d. 767) |
| 82134 | July 20 | Birth | 1304 – Petrarch, Italian poet and scholar (d. 1374) |
| 82135 | July 20 | Birth | 1537 – Arnaud d'Ossat, French cardinal (d. 1604) |
| 82136 | July 20 | Birth | 1620 – Nikolaes Heinsius the Elder, Dutch poet and scholar (d. 1681) |
| 82137 | July 20 | Birth | 1754 – Antoine Destutt de Tracy, French philosopher and academic (d. 1836) |
| 82138 | July 20 | Birth | 1757 – Garsevan Chavchavadze, Georgian politician and diplomat (d. 1811) |
| 82139 | July 20 | Birth | 1762 – Jakob Haibel, Austrian tenor and composer (d. 1826) |
| 82140 | July 20 | Birth | 1774 – Auguste de Marmont, French general (d. 1852) |