June 1 - Greek military junta abolishes the monarchy and proclaims a republic.
June 3 - Tupolev Tu-144 crashes at the Paris air show - 15 dead.
June 4 - patent for the ATM granted to Don Wetzel, Tom Barnes and George Chastain.
June 9 - Secretariat wins the Belmont Stakes becoming the first Triple Crown of Thoroughbred Racing winner since 1948.
June 22 - William Mark Felt retires from the FBI.
June 25 - Erskine Hamilton Childers is elected the fourth President of Ireland.
June 26 - On Plesetsk Cosmodrome 9 persons were killed at an explosion of a Cosmos 3-M rocket.
June 30 - Very long total solar eclipse visible in NE South America, the Atlantic, and central Africa. During the entire Second Millennium, only seven total solar eclipses exceeded seven minutes of totality. This was the last. Observers aboard a Concorde jet were able to stretch totality to about 74 minutes by flying along the path of the moon's umbra.

July 1 - US Drug Enforcement Agency founded.
July 10 - The Bahamas gain full independence within the British Commonwealth.
July 12 - A major fire destroys the entire 6th floor of the National Personnel Records Center. The disaster comes to be known as the 1973 National Archives Fire.
July 16 - Watergate Scandal: Former White House aide Alexander Butterfield informs the United States Senate committee investigating the scandal that President Richard Nixon had secretly recorded potentially incriminating conversations.
July 20 - France resumes nuclear bomb tests in Mururoa Atoll over protestations of Australia and New Zealand.
July 25 - Soviet Mars 5 space probe launched.
July 30 - An 11-year legal action for the victims of Thalidomide ends.

August 2 - Flash fire kills 51 at the Summerland amusement centre at Douglas, Isle of Man.
August 5 - Black September members open fire at Athens airport - 3 dead, 55 injured.
August 13 - The film of Jesus Christ Superstar is released.
August 15 - The U.S. bombing of Cambodia ends, marking the official halt to 12 years of combat activity in Southeast Asia.
August 22 - Henry Kissinger, United States National Security Advisor, is named Secretary of State.

September 11 - Chile's democratically elected government is overthrown in military coup after serious instability. President Salvador Allende dies, and General Augusto Pinochet heads a military junta that will govern Chile for the next 17 years.
September 15 - Sweden's king Gustav VI Adolf dies. Carl XVI Gustav becomes king.
September 18 - Chile's national day.
September 18 - The two German Republics, the BRD and the DDR, are admitted to the United Nations.
September 20 - Billed as The Battle of the Sexes, Billie Jean King defeats Bobby Riggs 6-4, 6-4, 6-3.
September 28 - ITT bombed in New York City to protest their involvement with the Coup in Chile.

October 6 - Yom Kippur War - Fourth and largest Arab-Israeli conflict begins as Egyptian and Syrian forces attack Israel as Jews mark Yom Kippur.
October 10 - Spiro T. Agnew resigns as vice president of the United States and then, in federal court in Baltimore, pleads no contest to charges of evasion of income taxes on $29,500 he received in 1967 while he was governor of Maryland. He is fined $10,000 and put on three years' probation.
October 17 - A worldwide oil shortage, the 1973 energy crisis, followed an Arab Oil Embargo against several countries which gave support to Israel.
October 20 - The Saturday Night Massacre.
October 20 - Sydney Opera House is opened by Elizabeth II.
October 26 - Yom Kippur War ends.
October 27 - The Canyon City meteorite, a 1.4 kg chondrite type meteorite struck earth in Fremont County, Colorado.