- Iraqi Revolution: A group of military officers known as the "Free Officers" led by Brigadier Abdul Karim Qasim overthrow the monarchy of King Faisal II in a bloodless coup. The Iraqi monarchy, established under the British Mandate, was abolished and the Iraqi Republic was proclaimed. Qasim became the new leader of the country.
- Lebanon Crisis: The United States dispatched a force of 14,000 U.S. Marines to Lebanon in response to a request from Lebanese President Camille Chamoun, who feared a growing civil conflict. The deployment was intended to help stabilize the situation and support the pro-Western government.
- British Motor Corporation (BMC) Formed: The British Motor Corporation (BMC) was formed through the merger of the Austin Motor Company and the Nuffield Organization, two major British automotive companies. The merger aimed to improve efficiency and strengthen the competitiveness of the British automotive industry.
- USS Nautilus Completes First Trans-Arctic Voyage: The USS Nautilus, a nuclear-powered submarine, completed its historic first trans-Arctic voyage. It surfaced at the North Pole on July 23 after traveling under the ice for 96 hours. The journey marked a significant achievement in submarine navigation and Arctic exploration.
- Baseball's All-Star Game: The 1958 Major League Baseball All-Star Game was held at the Memorial Stadium in Baltimore, Maryland. The American League defeated the National League with a score of 4-3.
- Charles, Prince of Wales, Attends Gordonstoun School: Charles, Prince of Wales (the future King Charles III), arrived at Gordonstoun School in Scotland for his secondary education. The school was known for its rigorous curriculum and adventurous outdoor activities.