# 30 April 1993 – CERN announces World Wide Web protocols will be free.
# 29 April 1911 – Tsinghua University, one of mainland China's leading universities, is founded.
# 28 April 1945 – Benito Mussolini and his mistress Clara Petacci are executed by a firing squad consisting of members of the Italian resistance movement.
# 27 April 2018 – Panmunjom Declaration signed, declaring the end of the Korean conflict
# 26 April 1982 – Fifty-seven people are killed by former police officer Woo Bum-kon in a shooting spree in South Gyeongsang Province, South Korea.
우범곤(禹範坤, 1955년 2월 24일 ~ 1982년 4월 27일)은 하룻밤 사이 62명을 연속살해하고 자살한 대한민국의 경찰관이다. 1982년 4월 26일 경상남도 의령군 궁류면 궁류지서(지금의 궁류치안센터)에서 근무하던 중 총기난사 연속살인을 일으키고 수류탄으로 폭사했다. 최단시간 최다살상 기록으로 일본의 쓰야마 사건을 경신했으며, 이 기록은 2011년 노르웨이의 아네르스 베링 브레이비크에 의해 경신되기까지 유지된다.
# 25 April 1792 – "La Marseillaise" (the French national anthem) is composed by Claude Joseph Rouget de Lisle.
# 24 April 2013 – A building collapses near Dhaka, Bangladesh, killing 1,129 people and injuring 2,500 others.
# 23 April 2005 – The first ever YouTube video, titled "Me at the zoo", was published by user "jawed".
# 22 April 2016 – The Paris Agreement is signed, an agreement to help fight global warming.
# 21 April 1960 – Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.
# 20 April 1653 – Oliver Cromwell dissolves the Rump Parliament.
# 19 April 1960 – Students in South Korea hold a nationwide pro-democracy protest against president Syngman Rhee, eventually forcing him to resign.
# 18 April 1857 – "The Spirits Book" by Allan Kardec is published, marking the birth of Spiritualism in France.
# 17 April 1946 – The last French troops are withdrawn from Syria.
# 16 April 1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra.
# 15 April 1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra.
# 14 April 1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra.
# 13 April 1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra.
# 12 April 1992 – The Euro Disney Resort officially opens with its theme park Euro Disneyland; the resort and its park's name are subsequently changed to Disneyland Paris.
# 1960년 4월 11일 - 이승만 정부의 부정선거에 저항하다 실종된 김주열의 시신이 발견되다.
# 11 April 1970 – Apollo 13 is launched. 1976 – The Apple I is created.
# 10 April 1971 – Ping-pong diplomacy: In an attempt to thaw relations with the United States, China hosts the U.S. table tennis team for a week-long visit.
# 1975년 4월 9일 - 인혁당 사건과 관련된 8명의 피고들이 사형 선고를 받은 지 20시간 만에 모두 사형에 처해졌다. 이 사건으로 국제사법계에서는 사법살인이라는 비평과 함께 4월 9일을 국제사법계의 암흑의 날로 선포하였다. 2007년 대법원 재심에서 인혁당 사건이 고문에 의한 날조사건이라는 사실을 들어 피의자에게 무죄평결이 내려짐에 따라서 명예가 회복되었다.
# 08 Avril 1946 : nationalisation d'EDF-GDF.
# 07 Avril 1795 - Adoption en France du système métrique après un rapport de Claude-Antoine Prieur-Duvernois (Prieur de la Côte-d'Or).
# 06 April 1930 – At the end of the Salt March, Gandhi raises a lump of mud and salt and declares, "With this, I am shaking the foundations of the British Empire."
# 05 April 1998 – In Japan, the Akashi Kaikyō Bridge opens to traffic, becoming the longest bridge span in the world.
# 04 April 1973 – The Twin Towers of the World Trade Center in New York City are officially dedicated.
# 03 April 1948 – In Jeju Province, South Korea, a civil-war-like period of violence and human rights abuses begins, known as the Jeju uprising.
# 02 April 1982 – Falklands War: Argentina invades the Falkland Islands.
# 01 April 2001 – Same-sex marriage becomes legal in the Netherlands, the first contemporary country to allow it.