April 3 - Jawaharlal Nehru is elected de facto Prime Minister of India.

April 4 - James Hanratty is hanged in Bedford Gaol for the A6 murder; many believe he is innocent.

April 6 - Belgium reestablishes diplomatic relations with the Congo. - Leonard Bernstein causes controversy with his remarks before a concert featuring Glenn Gould with the New York Philharmonic, when he (Bernstein) announces that although he disagrees with Gould's style of playing the Brahms First Piano Concerto, he finds Gould's ideas fascinating and will conduct the piece anyway. Bernstein's action receives a withering review from New York Times music critic Harold C. Schonberg.

April 7 - Author Milovan Djilas is arrested in Yugoslavia.

April 8 - In France, the Évian Accords are adopted in a referendum with a majority of 90%.

April 9 - The 34th Academy Awards ceremony is held; West Side Story wins Best Picture.

April 10 - In Los Angeles, California, the first MLB game is played at Dodger Stadium.

April 13 - OAS leader Edmond Jouhaud is sentenced to death in France.

April 14 - A Cuban military tribunal convicts 1,179 Bay of Pigs attackers.

April 18 - The Commonwealth Immigration Bill in the United Kingdom removes free immigration from the citizens of member states of the Commonwealth of Nations.

April 20 - OAS leader Raoul Salan is arrested in Algiers.

April 21 - The Century 21 Exposition World's Fair opens in Seattle, Washington.

April 26 - The Ranger 4 spacecraft crashes into the Moon. (source: Wikipedia)