| 84841 | July 27 | Event | 1964 – Vietnam War: Five thousand more American military advisers are sent to South Vietnam bringing the total number of United States forces in Vietnam to 21,000. |
| 84842 | July 27 | Event | 1974 – Watergate scandal: The House of Representatives Judiciary Committee votes 27 to 11 to recommend the first article of impeachment (for obstruction of justice) against President Richard Nixon. |
| 84843 | July 27 | Event | 1976 – Former Japanese prime minister Kakuei Tanaka is arrested on suspicion of violating foreign exchange and foreign trade laws in connection with the Lockheed bribery scandals. |
| 84844 | July 27 | Event | 1981 – British television: On Coronation Street, Ken Barlow marries Deirdre Langton, which proves to be a national event scoring massive viewer numbers for the show. |
| 84845 | July 27 | Event | 1981 – Adam Walsh, 6-year-old son of John Walsh, is kidnapped in Hollywood, Florida and is found murdered two weeks later. |
| 84846 | July 27 | Event | 1983 – Black July: Eighteen Tamil political prisoners at the Welikada high security prison in Colombo are massacred by Sinhalese prisoners, the second such massacre in two days. |
| 84847 | July 27 | Event | 1987 – RMS Titanic Inc. begins the first expedited salvage of wreckage of the RMS Titanic. |
| 84848 | July 27 | Event | 1990 – The Supreme Soviet of the Belarusian Soviet Republic declares independence of Belarus from the Soviet Union. Until 1996 the day is celebrated as the Independence Day of Belarus after a referendum held that year the celebration of independence is mo |
| 84849 | July 27 | Event | 1990 – The Jamaat al Muslimeen attempt a coup d'état in Trinidad and Tobago, occupying the Trinidad and the studios of Trinidad and Tobago Television, holding Prime Minister A. N. R. Robinson and most of his Cabinet as well as the staff at the television |
| 84850 | July 27 | Event | 1995 – The Korean War Veterans Memorial is dedicated in Washington, D.C.. |
| 84851 | July 27 | Event | 1996 – Centennial Olympic Park bombing: In Atlanta, United States, a pipe bomb explodes at Centennial Olympic Park during the 1996 Summer Olympics. One woman (Alice Hawthorne) is killed, and a cameraman suffers a heart attack fleeing the scene. One hundre |
| 84852 | July 27 | Event | 1997 – About 50 people are killed in the Si Zerrouk massacre in Algeria. |
| 84853 | July 27 | Event | 2002 – Ukraine airshow disaster: A Sukhoi Su-27 fighter crashes during an air show at Lviv, Ukraine killing 85 and injuring more than 100 others, the largest air show disaster in history. |
| 84854 | July 27 | Event | 2005 – STS-114: NASA grounds the Space Shuttle, pending an investigation of the continuing problem with the shedding of foam insulation from the external fuel tank. During ascent, the external tank of the Space Shuttle Discovery sheds a piece of foam slig |
| 84855 | July 27 | Event | 2007 – Phoenix News Helicopter Collision: News helicopters from Phoenix, Arizona television stations KNXV and KTVK collide over Steele Indian School Park in central Phoenix while covering a police chase. |
| 84856 | July 27 | Event | 2012 – The opening ceremony for the Summer Olympics takes place in London. |
| 84857 | July 27 | Event | 2015 – At least 7 people are killed and many injured after gunmen attack an Indian police station in Punjab. |
| 84858 | July 27 | Birth | 1452 – Ludovico Sforza, Italian son of Francesco I Sforza (d. 1508) |
| 84859 | July 27 | Birth | 1667 – Johann Bernoulli, Swiss mathematician and academic (d. 1748) |
| 84860 | July 27 | Birth | 1733 – Jeremiah Dixon, English surveyor and astronomer (d. 1779) |
| 84861 | July 27 | Birth | 1740 – Jeanne Baré, French explorer (d. 1803) |
| 84862 | July 27 | Birth | 1741 – François-Hippolyte Barthélémon, French-English violinist and composer (d. 1808) |
| 84863 | July 27 | Birth | 1752 – Samuel Smith, American general and politician (d. 1839) |
| 84864 | July 27 | Birth | 1768 – Charlotte Corday, French assassin of Jean-Paul Marat (d. 1793) |
| 84865 | July 27 | Birth | 1768 – Joseph Anton Koch, Austrian painter (d. 1839) |
| 84866 | July 27 | Birth | 1773 – Jacob Aall, Norwegian economist and politician (d. 1844) |
| 84867 | July 27 | Birth | 1777 – Thomas Campbell, Scottish-French poet and academic (d. 1844) |
| 84868 | July 27 | Birth | 1777 – Henry Trevor, 21st Baron Dacre, English general (d. 1853) |
| 84869 | July 27 | Birth | 1781 – Mauro Giuliani, Italian singer-songwriter and guitarist (d. 1828) |
| 84870 | July 27 | Birth | 1784 – Denis Davydov, Russian general and poet (d. 1839) |