- Apr 1 "Hold On, I'm Comin'" single released by Sam & Dave
- Apr 1 1st world festival of black art (Dakar Senegal)
Event of Interest
Apr 1 Loyalist led by Ian Paisley, a Protestant fundamentalist preacher, founded the Ulster Constitution Defence Committee to challenge the civil rights movement; it set up a paramilitary-style wing called the Ulster Protestant Volunteers
Sports History
Apr 3 Tom Seaver signs with the Mets for a reported $50,000 bonus
- Apr 4 Pirate Radio Scotland changes name to Radio Ireland
- Apr 4 US performs nuclear test at Nevada Test Site
- Apr 5 WTVX TV channel 34 in Ft Pierce-Vero Beach, FL (IND) 1st broadcast
- Apr 6 Mihir Sen swims Palk Strait between Sri Lanka & India
- Apr 7 US recovers a lost hydrogen bomb from the Mediterranean sea floor (whoops)
- Apr 8 OAO 1, 1st orbiting astronomical observatory, launched
- Apr 8 Time publishes its "Is God Dead" issue - its first issue without an image
- Apr 9 Anaheim Stadium for California Angels opens
US Masters Golf
Apr 11 30th US Masters Tournament, Augusta National GC: Jack Nicklaus becomes first back-to-back champion winning an 18-hole Monday playoff with Tommy Jacobs and Gay Brewer
- Apr 11 Emmett Ashford becomes first African American major league baseball umpire in Washington Senators’ game against the Cleveland Indians at D.C. Stadium
Strangers in the Night
Apr 11 Frank Sinatra records "Strangers in the Night" single for his album of the same name. Later reaches #1 Billboard charts
- Apr 12 1st B-52 bombing on North Vietnam
- Apr 12 Atlanta-Fulton County Stadium opens; Pirates beat Braves 3-2
- Apr 12 Rocker Jan Berry crashes his Corvette into a parked truck, an accident which leaves him with long-lasting health issues
- Apr 13 Pan Am places $525,000,000 order for 25 Boeing 747s
- Apr 15 KHET TV channel 11 in Honolulu, HI (PBS) begins broadcasting
Aftermath
Apr 15 The Rolling Stones release "Aftermath", their fourth studio album in UK (6th in US)
NBA Record
Apr 18 Bill Russell becomes first African American coach in NBA history (Boston Celtics)
Event of Interest
Apr 21 Ethiopian Emperor Haile Selassie visits Kingston, Jamaica
- Apr 22 Atlanta Braves win their 1st game, beating NY Mets 8-4
- Apr 22 The Troggs second single "Wild Thing" released; tops the charts in July
- Apr 22 USSR performs underground nuclear test
- Apr 24 Atlanta Braves win NL-record 18 straight home games (17 in Milwaukee)
- Apr 25 Drunk driver kills 10 children in Asse, Belgium
- Apr 25 Rare daylight meteor observed from New Jersey, US to Quebec, Canada in the early evening
- Apr 26 An earthquake of magnitude 7.5 destroys Tashkent, Uzbekistan
- Apr 26 International Olympic Committee votes to award German city of Munich the right to host the 1972 Summer Olympic Games
Red Auerbach Retires
Apr 26 Red Auerbach retires as Boston Celtic's coach
Music Concert
Apr 27 Dmitri Shostakovich completes his 2nd Cello Concert
- Apr 28 20th NBA Championship: Boston Celtics beat LA Lakers, 4 games to 3
Academy Awards
Apr 28 38th Academy Awards: "The Sound of Music", Julie Christie & Lee Marvin win
- Apr 28 Cleveland ties record with 10th straight win since Opening Day
Music Premiere
Apr 28 David Diamond's 5th Symphony premieres with the New York Philharmonic conducted by Leonard Bernstein; the work was dedicated to the conductor
- Apr 28 OCAM, Common Afro-Mauritian Organization forms
- Apr 30 Anton LaVey founds the Church of Satan in San Francisco, California