- Apr 4 Dirk Stikker becomes chairman of OES
- Apr 5 Prague espionage trial against bishops & priests begins
Event of Interest
Apr 6 John Foster Dulles becomes advisor to US Secretary of State Acheson
John Foster Dulles
- Apr 9 4th Tony Awards: Cocktail Party & South Pacific win
Event of Interest
Apr 11 Prince Rainier III becomes ruler of Monaco
Rainier III
- Apr 11 US B-29 bomber shot down over Latvia
- Apr 14 1st edition of British comic "Eagle"
- Apr 14 Doorne's Auto factory opens in Netherlands
- Apr 18 1st opening night-game, Cards beat Pirates, 4-2
- Apr 18 Polish Catholic church & government sign accord over relations
- Apr 23 Nationalist China evacuates Hainan Island
- Apr 24 Independent republic of South Molukkas declared
- Apr 24 US President Harry Truman denies there are communists in the US government
- Apr 24 Jordan formally annexes the West Bank
- Apr 25 Republik Maluku Selatan (also known as the Republic of the South Moluccas) declared on Ambon
- Apr 27 South Africa passes Group Areas Act segregating races