- 1st » The BBC broadcasts the spaghetti tree hoax on its current affairs programme 'Panorama (TV series) or Panorama'.
- 5th » In India, Communist Party of India or Communists win the first elections in united Kerala and E.M.S. Namboodiripad is sworn in as the first chief minister.
- 6th » Greek shipping tycoon Aristotle Onassis buys the Hellenic National Airlines (TAE) and founds Olympic Airlines.
- 9th » The Suez Canal in Egypt is cleared and opens to shipping.
- 10th » The Suez Canal is reopened for all shipping after being closed for three months.
- 11th » United Kingdom agrees to Singaporean Self-governance of Singapore named self-rule.
- 15th » White Rock, British Columbia officially separates from Surrey, British Columbia and is municipal incorporation called incorporated as a new city.
- 24th » Suez Crisis: The Suez Canal is reopened following the introduction of United Nations Emergency Force named UNEF peacekeepers to the region.
- 24th » The BBC first broadcast The Sky at Night presented by Patrick Moore
Historical Events for April 1957