- Jan 22 Roe vs Wade: US Supreme Court legalizes most abortions
- Jan 23 US President Richard Nixon announces an accord has been reached to end Vietnam War
- Jan 27 US & North Vietnam's William Rogers & Nguyen Duy Trinh sign cease-fire, ending longest US war and military draft
- Mar 8 The Provisional Irish Republican Army undertakes its first operation in Great Britain, planting four car bombs in London; 10 members of PIRA are arrested at Heathrow Airport while trying to leave the country
- Apr 3 The first portable cell phone call is made in New York City, United States.
- Apr 4 World Trade Center, then the world's tallest building, opens in New York (110 stories)
- May 17 Senate Watergate Committee begins its hearings
- Oct 17 OPEC oil ministers use oil as an economic weapon in the Arab-Israeli War, mandating a cut in exports and recommending an embargo against unfriendly states
- Oct 20 Queen Elizabeth II opens Sydney Opera House
- Oct 30 The Bosphorus Bridge in Istanbul, Turkey is completed, connecting the continents of Europe and Asia over the Bosporus for the first time
A patent for the ATM is granted to Don Wetzel, Tom Barnes and George Chastain.
On June 4, 1973
Pink Floyd release their album "Dark Side of the Moon", since sold over 45 million copies
On March 1, 1973