Academy Awards
Apr 5 37th Academy Awards: "My Fair Lady", Rex Harrison (My Fair Lady) & Julie Andrews (Mary Poppins) win
Baseball Record
Apr 9 1st baseball game at Houston Astrodome, Astros beat NY Yankees 2-1 in exhibition as Mickey Mantle hits MLB's 1st indoor homerun; US President Lyndon Johnson and wife Lady Bird attend
- Apr 9 Beatles "Ticket to Ride" single is released in UK
US Masters Golf
Apr 11 29th US Masters Tournament, Augusta National GC: Jack Nicklaus wins the 2nd of his 6 Masters titles with a tournament record 271 (−17); beats Gary Player and Arnold Palmer by a record 9 strokes
- Apr 11 40 tornadoes strike US midwest killing 272 & injuring 5,000
- Apr 12 1st regular season MLB game at Houston Astrodome; visiting Philadelphia Phillies beat Astros 2-0
- Apr 13 1st US Senate black page, Lawrence W Bradford Jr, 16, appointed by New York Senator Jacob Javits
- Apr 13 7th Grammy Awards: "The Girl From Ipanema", The Beatles win
- Apr 13 The Beatles record their single "Help!"
- Apr 14 US performs nuclear test at Nevada Test Site
The Amen Corner
Apr 15 James Baldwin's 1954 stage drama "The Amen Corner" opens at Ethel Barrymore Theatre, NYC; runs for 84 performances
- Apr 15 NFL changes penalty flag from white to bright gold
- Apr 16 Test flight of heavy Saturn S-1C-rocket
Whipped Cream & Other Delights
Apr 19 "Whipped Cream & Other Delights", fourth full album by Herb Alpert & the Tijuana Brass Band, is released
- Apr 19 1st all news radio station (WINS 1010 AM in NYC) begins operating
- Apr 19 69th Boston Marathon won by Morio Shigematsu of Japan in race record 2:16:33
- Apr 19 At a cost of $20,000, the outer Astrodome ceiling is painted because of sun's glare, this causes the grass to die
- Apr 19 T.A.M.I. Show premieres in London
- Apr 20 People's Republic China offers North Vietnam military aid
- Apr 21 New York World's Fair reopens for 2nd & final season
- Apr 23 "I Can't Help Myself (Sugar Pie Honey Bunch)" single released by the Four Tops (Billboard Song of the Year 1965)
- Apr 23 Launch of 1st Soviet communications satellite
- Apr 24 "Comedy in Music-Opus 2" closes at John Golden NYC after 192 performances
- Apr 24 Military coup under Donald Reid Cabral in Dominican Republic
- Apr 25 19th NBA Championship: Boston Celtics beat LA Lakers, 4 games to 1
- Apr 25 David Heneker's musical "Half a Sixpence", starring Tommy Steels, and based on H.G. Well's 1905 novel "Kipps", opens at Broadhurst Theater, NYC; runs for 511 performances
Music Premiere
Apr 26 Charles Ives' 4th Symphony premieres at Carnegie Hall, New York, 11 years after the composer's death
- Apr 27 RC Duncan patents "Pampers" disposable diaper
My Name is Barbra
Apr 28 "My Name is Barbra", Barbra Streisand's first television special, premieres on CBS
- Apr 28 Lindsey Nelson broadcasts baseball game at Houston Astrodome from a hanging gondola
Music Concert
Apr 28 Luciano Pavarotti makes his debut at La Scala, Milan in Franco Zeffirelli's production of "La bohème" with Mirella Freni
- Apr 28 Richard Helms replaces Marshall S. Carter as deputy director of CIA
- Apr 28 US marines invade Dominican Republic, stay until October 1966
- Apr 28 William F. Raborn Jr. replaces John A. McCone as 7th head of CIA
- Apr 29 Australian government announces it would send troops to Vietnam
Music History
Apr 29 Canadian folk singer-songwriter Joni Anderson (soon to be known as Joni Mitchell) meets American folk singer and future husband Chuck Mitchell at a gig in Toronto, Ontario
- Apr 29 Earthquake hits Seattle; 5 die
- Apr 29 Malta becomes 18th member of Council of Europe
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists