| 1st January 1948 | Railways are nationalised to form British Railways. |
| 30th January 1948 | Indian pacifist and leader Mahatma Gandhi is assassinated by Nathuram Godse. |
| 30th January 1948 | The 1948 Winter Olympics open in St. Moritz, Switzerland. |
| 4th February 1948 | Ceylon, later renamed Sri Lanka, becomes independent within the British Commonwealth. King George VI becomes King of Ceylon. |
| 17th March 1948 | The Hells Angels motorcycle gang is founded in California. |
| 7th April 1948 | The World Health Organisation is established by the United Nations. |
| 30th April 1948 | The Land Rover is unveiled at the Amsterdam Motor Show. |
| 4th May 1948 | Laurence Olivier's film version of “Hamlet” makes its world premiere in London. |
| 22nd June 1948 | The ship ‘Empire Windrush’ brings the first group of several hundred black immigrants to Tilbury near London from the Caribbean countries. This is the start of multiculturalism in Britain. |
| 28th June 1948 | David Lean's “Oliver Twist“, based on Charles Dickens' famous novel, premieres in the United Kingdom. The film is banned for three years in the United States due to alleged anti-Semitism in the depiction of Fagin. |
| 15th July 1948 | The first London branch of Alcoholics Anonymous is founded. |
| 29th July 1948 | The 1948 Summer Olympics begin in London. The Olympic Games had previously been on a twelve-year hiatus due to the Second World War. |
| 9th September 1948 | The Democratic People's Republic of Korea is formally declared, with Kim Il-sung as Prime Minister. |
| 5th October 1948 | The 1948 Ashgabat earthquake kills 100,000 people in the Soviet Union. |
| 2nd November 1948 | Democratic incumbent Harry S. Truman defeats Republican Thomas E. Dewey and 'Dixiecrat' Strom Thurmond in the 1948 United States presidential election. |
| 12th November 1948 | In Tokyo, an international war crimes tribunal sentences seven Japanese military and government officials to death, for their roles in the Second World War. One of those executed is General Hideki Tojo. |
| 14th November 1948 | Birth of Prince Charles, heir to the throne. |