| 70351 | June 20 | Event | 1887 – Victoria Terminus, the busiest railway station in India, opens in Bombay. |
| 70352 | June 20 | Event | 1893 – Lizzie Borden is acquitted of the murders of her father and stepmother. |
| 70353 | June 20 | Event | 1895 – The Kiel Canal, crossing the base of the Jutland peninsula and the busiest artificial waterway in the world, is officially opened. |
| 70354 | June 20 | Event | 1900 – Boxer Rebellion: The Imperial Chinese Army begins a 55-day siege of the Legation Quarter in Beijing, China. |
| 70355 | June 20 | Event | 1900 – Baron Eduard Toll, leader of the Russian Polar Expedition of 1900, departs Saint Petersburg in Russia on the explorer ship Zarya, never to return. |
| 70356 | June 20 | Event | 1921 – Workers of Buckingham and Carnatic Mills in the city of Chennai, India, begin a four-month strike. |
| 70357 | June 20 | Event | 1940 – World War II: Italy begins an unsuccessful invasion of France. |
| 70358 | June 20 | Event | 1941 – The United States Army Air Corps is deprecated to being the American training and logistics section of what is known until 1947 as the United States Army Air Forces, just two days before Hitler's invasion of the Soviet Union. |
| 70359 | June 20 | Event | 1942 – The Holocaust: Kazimierz Piechowski and three others, dressed as members of the SS-Totenkopfverbände, steal an SS staff car and escape from the Auschwitz concentration camp. |
| 70360 | June 20 | Event | 1943 – The Detroit race riot breaks out and continues for three more days. |
| 70361 | June 20 | Event | 1944 – World War II: The Battle of the Philippine Sea concludes with a decisive U.S. naval victory. The lopsided naval air battle is also known as the "Great Marianas Turkey Shoot". |
| 70362 | June 20 | Event | 1944 – Continuation War: The Soviet Union demands an unconditional surrender from Finland during the beginning of partially successful Vyborg–Petrozavodsk Offensive. The Finnish government refuses. |
| 70363 | June 20 | Event | 1945 – The United States Secretary of State approves the transfer of Wernher von Braun and his team of Nazi rocket scientists to America. |
| 70364 | June 20 | Event | 1948 – Toast of the Town, later The Ed Sullivan Show, makes its television debut. |
| 70365 | June 20 | Event | 1956 – A Venezuelan Super-Constellation crashes in the Atlantic Ocean off Asbury Park, New Jersey, killing 74 people. |
| 70366 | June 20 | Event | 1959 – A rare June hurricane strikes Canada's Gulf of St. Lawrence killing 35. |
| 70367 | June 20 | Event | 1960 – The Mali Federation gains independence from France (it later splits into Mali and Senegal). |
| 70368 | June 20 | Event | 1963 – The so-called "red telephone" link is established between the Soviet Union and the United States following the Cuban Missile Crisis. |
| 70369 | June 20 | Event | 1972 – Watergate scandal: An 18½-minute gap appears in the tape recording of the conversations between U.S. President Richard Nixon and his advisers regarding the recent arrests of his operatives while breaking into the Watergate complex. |
| 70370 | June 20 | Event | 1973 – Ezeiza massacre in Buenos Aires, Argentina. Snipers fire upon left-wing Peronists. At least 13 are killed and more than 300 are injured. |
| 70371 | June 20 | Event | 1979 – ABC News correspondent Bill Stewart is shot dead by a Nicaraguan soldier under the regime of Anastasio Somoza Debayle. The murder is caught on tape and sparks an international outcry against the regime. |
| 70372 | June 20 | Event | 1982 – The Argentine Corbeta Uruguay base on Southern Thule surrenders to Royal Marine commandos in the final action of the Falklands War. |
| 70373 | June 20 | Event | 1990 – Asteroid Eureka is discovered. |
| 70374 | June 20 | Event | 1991 – The German Bundestag votes to move the capital from Bonn back to Berlin. |
| 70375 | June 20 | Event | 2001 – Andrea Yates, in an attempt to save her young children from Satan, drowns all five of them in a bathtub in Houston, Texas. |
| 70376 | June 20 | Event | 2003 – The Wikimedia Foundation is founded in St. Petersburg, Florida. |
| 70377 | June 20 | Birth | 1005 – Ali az-Zahir, Egyptian caliph (d. 1036) |
| 70378 | June 20 | Birth | 1389 – John of Lancaster, 1st Duke of Bedford, English politician (d. 1435) |
| 70379 | June 20 | Birth | 1469 – Gian Galeazzo Sforza, Italian husband of Isabella of Naples (d. 1494) |
| 70380 | June 20 | Birth | 1485 – Astorre III Manfredi, Italian lord (d. 1502) |