- Apr 1 United Kingdom lifts all restrictions on gold ownership
- Apr 1 US/Canada ISIS 2 launched to study ionosphere
- Apr 2 Dark Shadows, American Gothic supernatural soap opera, concludes an almost 5 year run on ABC
- Apr 2 Libya concludes 5 weeks of negotiations with Western oil companies in Tripoli
- Apr 3 125th Grand National: John Cook aboard 28/1 chance Specify wins a close finish between the leading 5 in the final furlong
- Apr 3 16th Eurovision Song Contest: Severine for Monaco wins singing "Un banc, un arbre, une rue" in Dublin
- Apr 3 The Temptations score their second US No. 1 with "Just My Imagination (Running Away With Me)"
- Apr 4 Marine clay under houses liquefies in St-Jean-Vianney, Quebec, 31 die
Follies
Apr 4 Stephen Sondheim's "Follies" opens at Winter Garden Theater, NYC; runs for 524 performances, then most expensive Broadway musical at the time
- Apr 5 Fran Phipps is 1st woman to reach North Pole
- Apr 5 Mount Etna erupts in Sicily
Event of Interest
Apr 5 Sri Lanka's communist Janatha Vimukthi Peramuna (JVP) launches insurrection against the United Front government of Sirimavo Bandaranaike
- Apr 5 US Lt William Calley sentenced to life imprisonment for murdering 22 unarmed South Vietnamese civilians in the My Lai Massacre
- Apr 5 WNJT TV channel 52 in Trenton, New Jersey (PBS) begins broadcasting
Event of Interest
Apr 6 During a debate at Westminster on Northern Ireland, Harold Wilson of the Labour Party claims that a draft Bill for the imposition of direct rule exists
Sports History
Apr 7 Dismissal of Curt Flood's free agency suit against baseball is upheld by the US Court of Appeals for the Second Circuit [1]
Event of Interest
Apr 7 US President Richard Nixon orders lt Calley (Mi Lai) free
- Apr 7 WCJB TV channel 20 in Gainesville, FL (ABC/NBC) begins broadcasting 3-judge US Circuit Court of Appeals
- Apr 8 1st legal off-track betting system begins (OTB-New York)
It Don't Come Easy
Apr 9 Ringo Starr releases single "It Don't Come Easy", produced by George Harrison, in the UK
- Apr 10 Philadelphia Phillies open their new home, Veterans Stadium, with a 4-1 win over the Montreal Expos; 55,352, largest ever crowd to watch a MLB game in Pennsylvania
- Apr 10 The Republican commemorations is held in Belfast of the Easter Rising (in 1916 in Dublin), revealing conflicts between the two wings of the Irish Republican Army
- Apr 10 US table tennis team arrives in People's Republic of China
- Apr 11 "Johnny Johnson" opens/closes at Edison Theater NYC for 1 performance
US Masters Golf
Apr 11 35th US Masters Tournament, Augusta National GC: Charles Coody wins his only major title by 2 strokes ahead of runners-up Johnny Miller and Jack Nicklaus
- Apr 11 WBFF TV channel 45 in Baltimore, MD (IND) begins broadcasting
- Apr 14 Fort Point, San Francisco dedicated as a national historic site
- Apr 14 US President Richard Nixon ends blockade against People's Republic of China
- Apr 14 US Supreme Court upheld busing as means of achieving racial desegregation
Academy Awards
Apr 15 43rd Academy Awards: "Patton", George C Scott & Glenda Jackson win
70, Girls, 70
Apr 15 John Kander and Fred Ebbs' musical "70, Girls, 70", starring Hans Conried and Mildred Natwick, opens at Broadhurst Theater, NYC; runs for 35 performances
Cricket History
Apr 19 After smashing 124 in the 1st innings, Indian cricket opener Sunil Gavaskar makes 220 in 2nd innings in the drawn 5th Test against the West Indies in Port of Spain, Trinidad
Murder of Interest
Apr 19 Charles Manson sentenced to life in prison for the murder of Sharon Tate
- Apr 19 Sierra Leone becomes a republic (National Day)
- Apr 19 USSR Salyut 1 launched; 1st manned lab in orbit
We've Only Just Begun
Apr 20 Barbra Streisand records "We've Only Just Begun"
- Apr 20 US Supreme Court upholds use of busing to achieve racial desegregation
- Apr 21 Original Codex Reguis (with Edda-liederen) returns to Iceland
- Apr 22 Soviet spacecraft Soyuz 10 launched
- Apr 22 Soyuz 10 launches as the world's first mission to the first-ever space station (the Salyut 1) however the docking was unsuccessful and the cosmonauts returned to Earth
- Apr 23 Columbia University operations virtually end, by student strike
- Apr 24 Skip Redwine and Larry Frank's musical "Frank Merriwell" opens and closes at Longacre Theater, NYC (1 performance only)
- Apr 24 Soyuz 10 returns to Earth
- Apr 25 About 200,000 anti-Vietnam War protesters march on Washington, D.C.
- Apr 25 The Northern Ireland census is held
- Apr 25 US canal rights in Nicaragua & rights to Corn Islands expire
- Apr 25 USSR performs nuclear test at the Semipalatinsk Test Site in northeast Kazakhstan
- Apr 26 Heaviest rains ever in Bahia district of Brazil, 15" in 24 hrs
- Apr 26 San Francisco lightship replaced by automatic buoy
- Apr 26 Turkey state of siege proclaimed
- Apr 27 Curt Flood resigns Senators after 13 games & departs for Denmark
- Apr 28 Dutch social democratic party/D'66/DS'70 win parliamentary election
- Apr 28 Samuel Lee Gravely Jr. becomes 1st black admiral in US Navy
- Apr 29 Boeing receives contract for Mariner 10, Mercury exploration
- Apr 29 US performs nuclear test at Nevada Test Site
- Apr 30 25th NBA Championship: Milwaukee beat Baltimore Bullets in 4 games
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists