Event of Interest
Apr 1 John Lennon and Yoko Ono release hoax they are having dual sex change operations

John Lennon

Yoko Ono
- Apr 1 Federal Bankruptcy Referee Sidney Volinn declares MLB's Seattle Pilots bankrupt; car dealer Bud Selig buys franchise for $10.8 million and moves club to Milwaukee (Brewers)
Event of Interest
Apr 1 US President Richard Nixon signs bill limiting cigarette advertisements from 1st Jan 1971

Richard Nixon
- Apr 1 Serious riots continue in the Ballymurphy estate in Belfast between Catholic residents and the British Army
- Apr 2 Meghalaya becomes autonomous state within India's Assam state
- Apr 2 2 men begin ascent of south face of Annapurna I, highest final stage in a wall climb in world
- Apr 3 Miriam Hargrave of England passes her drivers test on 40th attempt
- Apr 3 As part of a new 'get tough' policy in Northern Ireland, Ian Freeland of the British Army, warned that those throwing petrol bombs could be shot dead
- Apr 4 Firestone World Tournament of Champions won by Don Johnson
- Apr 4 124th Grand National: 15/1 chance Gay Trip wins by 20 lengths, giving Irish jockey Pat Taaffe his second GN winner
- Apr 5 WSNS TV channel 44 in Chicago, IL (IND) begins broadcasting
- Apr 7 "Effects of Gamma Rays on Man-in-the-moon Marigolds," premieres in NYC
Academy Awards
Apr 7 42nd Academy Awards: "Midnight Cowboy", John Wayne & Maggie Smith win

John Wayne

Maggie Smith
Event of Interest
Apr 10 Paul McCartney officially announces the split of The Beatles

Paul McCartney
Event of Interest
Apr 12 Yankees dedicate plaques to Mickey Mantle & Joe DiMaggio

Mickey Mantle

Joe DiMaggio
- Apr 13 34th US Masters Tournament, Augusta National GC: Billy Casper defeats Gene Littler, 69 to 74 in a Monday 18-hole playoff to win his 3rd major title; last 18-hole playoff at the Masters
- Apr 13 Greek composer Mikis Theordorakis freed
- Apr 13 Apollo 13 announces "Okay, Houston, we've had a problem here", as Beech-built oxygen tank explodes en route to Moon
- Apr 13 Oakland uses gold-colored bases during the club's home opener: Rules Committee subsequently bans this innovation
Music Awards
Apr 13 5th Academy of Country Music Awards: Merle Haggard and Tammy Wynette win

Merle Haggard

Tammy Wynette
- Apr 14 "Boy Friend" opens at Ambassador Theater NYC for 119 performances
- Apr 15 "Cry for Us All" closes at Broadhurst Theater NYC after 8 performances
- Apr 15 Libyan leader Gadaffi launches "Green Revolution"
- Apr 15 WMGZ TV channel 16 in Mayaguez, PR ([M]) begins broadcasting
- Apr 15 WPSJ TV channel 14 in Ponce, PR ([P]) begins broadcasting
- Apr 16 70 die in a snow crush (France)
Event of Interest
Apr 16 Protestant Unionist Ian Paisley wins seat formerly held by Terence O'Neill in the Stormont (North Ireland Parliament)

Ian Paisley

Terence O'Neill
- Apr 17 Apollo 13 limps back safely, Beech-built oxygen tank no help
- Apr 17 Paul McCartney's 1st solo album "McCartney" is released
- Apr 18 France beats England, 35-13 at Stade Colombes, Paris to earn a share of the Five Nations Rugby Championship with Wales
- Apr 19 "Look to the Lilies" closes at Lunt-Fontanne NYC after 25 performances
- Apr 19 24th Tony Awards: Borstal Boy & Applause win
- Apr 20 74th Boston Marathon: Englishman Ron Hill wins in 2:10:30 (US record): American Sara Mae Berman 1st woman for 2nd straight year in 3:05:07 (unsanctioned)
- Apr 20 Bruno Kreisky becomes 1st socialist chancellor of Austria
- Apr 21 Reds clout 7 HRs by 6 batters, Braves counter with 3 HRs, 6 for one team & 9 different batters for two teams, all tie or set records
- Apr 21 The Principality of Hutt River (previously Hutt River Province) secedes from Australia - it remains unrecognised by Australia or other nations
- Apr 21 The Alliance Party of Northern Ireland (APNI) is formed; it attempts to appeal to Catholics and Protestant to unite in support of moderate policies
- Apr 22 "Park" opens at John Golden Theater NYC for 5 performances
- Apr 22 First Earth Day celebrated, founded by Gaylord Nelson
- Apr 22 NY Met Jerry Grote sets record of 20 put outs by a catcher
Baseball Record
Apr 22 NY Met Tom Seaver strikes out last 10 Padres, for a total of 19

Tom Seaver
- Apr 22 Senators beat Yankees 2-1 in 18 innings
- Apr 24 People's Republic of China launches its 1st satellite transmitting song "East is Red"
- Apr 24 Gambia becomes a republic within the Commonwealth
- Apr 25 "Park" closes at John Golden Theater NYC after 5 performances
- Apr 25 Freda Payne releases "Band of Gold"
- Apr 25 Melanie (Safka) releases "Lay Down"
- Apr 26 "Company" opens at Alvin Theater NYC for 690 performances
- Apr 29 US and South Vietnamese forces launch an incursion into Cambodia, expanding the Vietnam War
- Apr 30 Cubs Billy Williams is 1st NLer to play in 1,000 consecutive games
- Apr 30 US troops invade Cambodia