| 41581 | April 11 | Event | 1951 – Korean War: President Harry Truman relieves General of the Army Douglas MacArthur of overall command in Korea. |
| 41582 | April 11 | Event | 1951 – The Stone of Scone, the stone upon which Scottish monarchs were traditionally crowned, is found on the site of the altar of Arbroath Abbey. It had been taken by Scottish nationalist students from its place in Westminster Abbey. |
| 41583 | April 11 | Event | 1952 – The Battle of Nanri Island takes place. |
| 41584 | April 11 | Event | 1955 – The Air India Kashmir Princess is bombed and crashes in a failed assassination attempt on Zhou Enlai by the Kuomintang. |
| 41585 | April 11 | Event | 1957 – United Kingdom agrees to Singaporean self-rule. |
| 41586 | April 11 | Event | 1961 – The trial of Adolf Eichmann begins in Jerusalem. |
| 41587 | April 11 | Event | 1963 – Pope John XXIII issues Pacem in terris, the first encyclical addressed to all instead of to Catholics alone. |
| 41588 | April 11 | Event | 1965 – The Palm Sunday tornado outbreak of 1965: Fifty-one tornadoes hit in six Midwestern states, killing 256 people. |
| 41589 | April 11 | Event | 1968 – President Lyndon B. Johnson signs the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing. |
| 41590 | April 11 | Event | 1970 – Apollo 13 is launched. |
| 41591 | April 11 | Event | 1972 – First edition of the BBC comedy panel game I'm Sorry I Haven't A Clue is broadcast, one of the longest-running British radio shows in history. |
| 41592 | April 11 | Event | 1976 – The Apple I is created. |
| 41593 | April 11 | Event | 1977 – London Transport's Silver Jubilee buses are launched. |
| 41594 | April 11 | Event | 1979 – Ugandan dictator Idi Amin is deposed. |
| 41595 | April 11 | Event | 1981 – A massive riot in Brixton, south London, results in almost 300 police injuries and 65 serious civilian injuries. |
| 41596 | April 11 | Event | 1987 – The London Agreement is secretly signed between Israeli Foreign Affairs Minister Shimon Peres and King Hussein of Jordan. |
| 41597 | April 11 | Event | 1989 – Ron Hextall becomes the first goaltender in NHL history to score a goal in the playoffs. |
| 41598 | April 11 | Event | 1990 – Customs officers in Middlesbrough, England, United Kingdom, say they have seized what they believe to be the barrel of a massive gun on a ship bound for Iraq. |
| 41599 | April 11 | Event | 1993 – Four hundred fifty prisoners rioted at the Southern Ohio Correctional Facility in Lucasville, Ohio, and continued to do so for ten days, citing grievances related to prison conditions, as well as the forced vaccination of Nation of Islam prisoners |
| 41600 | April 11 | Event | 2001 – The detained crew of a United States EP-3E aircraft that landed in Hainan, China after a collision with a J-8 fighter, is released. |
| 41601 | April 11 | Event | 2002 – The Ghriba synagogue bombing by al-Qaeda kills 21 in Tunisia. |
| 41602 | April 11 | Event | 2002 – Over two hundred thousand people marched in Caracas towards the Presidential Palace of Miraflores, to demand the resignation of president Hugo Chávez. 19 of the protesters are killed, and the Minister of Defense Gral. Lucas Rincon announces Hugo Ch |
| 41603 | April 11 | Event | 2006 – Iranian president Mahmoud Ahmadinejad announces that Iran has successfully enriched uranium. |
| 41604 | April 11 | Event | 2007 – 2007 Algiers bombings: Two bombings in the Algerian capital of Algiers kill 33 people and wound a further 222 others. |
| 41605 | April 11 | Event | 2011 – An explosion in the Minsk Metro, Belarus kills 15 people and injures 204 others. |
| 41606 | April 11 | Event | 2012 – An 8.2 magnitude earthquake hits Indonesia, off northern Sumatra at a depth of 16.4 km. A tsunami hits the island of Nias at Indonesia. |
| 41607 | April 11 | Birth | 145 – Septimius Severus, Roman emperor (d. 211) |
| 41608 | April 11 | Birth | 1357 – John I of Portugal (d. 1433) |
| 41609 | April 11 | Birth | 1374 – Roger Mortimer, 4th Earl of March, English husband of Alianore Holland, Countess of March (d. 1398) |
| 41610 | April 11 | Birth | 1492 – Marguerite de Navarre, French wife of Henry II of Navarre (d. 1549) |