1st January » Denmark, the United Kingdom, and Republic of Ireland known as Ireland are admitted into the European Economic Community.
8th January » Soviet Union e.g Soviet space mission 'Luna 21' is launched.
8th January » Watergate scandal: The trial of seven men accused of illegal entry into Democratic Party (United States) called Democratic Party headquarters at Watergate complex e.g Watergate begins.
11th January » Major League Baseball owners vote in approval of the American League adopting the designated hitter position.
15th January » Vietnam War: Citing progress in peace negotiations, President of the United States called President Richard Nixon announces the suspension of offensive action in North Vietnam.
22nd January » The Supreme Court of the United States delivers its decisions in Roe v. Wade and Doe v. Bolton, legalizing elective abortion in all fifty states.
22nd January » The crew of Apollo 17 addresses a joint session of Congress after the completion of the final Apollo moon landing mission.
22nd January » A chartered Boeing 707 explodes in flames upon landing at Kano Airport, Nigeria, killing 176.
23rd January » President of the United States or President Richard Nixon announces that a peace accord has been reached in Vietnam.
23rd January » A volcano or volcanic eruption devastates Heimaey in the Vestmannaeyjar chain of islands off the south coast of Iceland.
9th February » Biju Patnaik of the Pragati Legislature Party is elected leader of the opposition in the state assembly in Odisha, India.
11th February » Vietnam War: First release of American prisoner of war known as prisoners of war from Vietnam takes place.
21st February » Over the Sinai Desert, Israeli fighter aircraft shoot down Libyan Arab Airlines Flight 114 jet killing 108.
27th February » The American Indian Movement (AIM) Wounded Knee incident or occupies Wounded Knee, South Dakota.
1st March » Black September (group) Black September storms the Saudi Arabia Saudi embassy in Khartoum, Sudan, resulting in the Attack on the Saudi embassy in Khartoum assassination of three Western hostages.
17th March » The Pulitzer Prize-winning photograph 'Burst of Joy' is taken, depicting a former prisoner of war being reunited with his family, which came to symbolize the end of United States involvement in the Vietnam War.
24th March » Kenyan athlete Kip Keino defeats Jim Ryun at the first-ever professional track meet in Los Angeles.
29th March » Vietnam War: The last United States combat soldiers leave South Vietnam.
29th March » Operation Barrel Roll, a covert US bombing campaign in Laos to stop PAVN known as communist infiltration of South Vietnam, ends.
1st April » Project Tiger, a tiger conservation project, is launched in the Corbett National Park, India.
2nd April » Launch of the LexisNexis computerized legal research service.
2nd April » The Liberal Movement (Australia) named Liberal Movement breaks away from the Liberal and Country League in South Australia.
3rd April » Martin Cooper (inventor) called Martin Cooper of Motorola makes the History of mobile phones called first handheld mobile phone call to Joel S. Engel of Bell Labs, though it took ten years for the DynaTAC 8000X to become the first such phone to be commerc
4th April » The World Trade Center in New York City e.g New York is officially dedicated.
4th April » A Lockheed C-141 Starlifter, dubbed the 'Hanoi Taxi', makes the last flight of Operation Homecoming.
6th April » The American League of Major League Baseball begins using the designated hitter.
10th April » A British Vickers Vanguard turboprop aircraft crashes in a snowstorm at Basel, Switzerland killing 104 people.
17th April » George Lucas begins writing the treatment for Star Wars called The Star Wars.
19th April » The Portuguese Socialist Party (Portugal) called Socialist Party is founded in the German town of Bad Münstereifel.
30th April » Watergate scandal: U.S. President Richard Nixon announces that top White House aides H. R. Haldeman, John Ehrlichman and others have resigned.
5th May » Secretariat (horse) wins the 1973 Kentucky Derby in 1:59 2/5, a still standing record.
8th May » A Wounded Knee incident e.g 71-day standoff between federal authorities and the American Indian Movement members occupying the Pine Ridge Reservation at Wounded Knee, South Dakota ends with the surrender of the militants.
11th May » Citing government misconduct, Daniel Ellsberg has charges for his involvement in releasing the Pentagon Papers to 'The New York Times' dismissed.
17th May » Watergate scandal: Televised hearings begin in the United States Senate.
25th May » HNS Velos (D-16), while participating in a NATO exercise and in order to protest against the Greek military junta of 1967-1974 called dictatorship in Greece, anchored at Fiumicino, Italy, refusing to return to Greece.
29th May » Tom Bradley (American politician) called Tom Bradley is elected the first black mayor of Los Angeles called Los Angeles, California.
31st May » The United States Senate votes to cut off funding for the bombing of Khmer Rouge targets within Cambodia, hastening the end of the Cambodian Civil War.
9th June » In horseracing, Secretariat (horse) or Secretariat wins the Triple Crown of Thoroughbred Racing called Triple Crown.
20th June » 1973 Ezeiza massacre known as Ezeiza massacre in Buenos Aires, Argentina. Snipers fire upon left-wing Peronism called Peronists. At least 13 are killed and more than 300 are injured.
21st June » In handing down the decision in 'Miller v. California' 413 US 15, the Supreme Court of the United States establishes the Miller Test for obscenity in U.S. law.
23rd June » A fire at a house in Kingston upon Hull or Hull, England which kills a six year old boy is passed off as an accident; it later emerges as the first of 26 deaths by fire caused over the next seven years by arsonist Bruce George Peter Lee or Peter Dinsdale.
24th June » The UpStairs Lounge arson attack took place on June 24, 1973 at a gay bar located on the second floor of the three-story building at 141 Chartres Street in the French Quarter of New Orleans, Louisiana. Thirty-two people died as a result of fire or smoke i
26th June » At Plesetsk Cosmodrome nine people are killed in an explosion of a Cosmos 3-M rocket.
27th June » The President of Uruguay Juan María Bordaberry dissolves Parliament and establishes a dictatorship.
28th June » Elections are held for the Northern Ireland Assembly, 1973 Northern Ireland Assembly, which will lead to power-sharing between Unionism in Ireland unionists and Irish nationalism nationalists in Northern Ireland for the first time.
5th July » A BLEVE (Boiling Liquid Expanding Vapor Explosion) in Kingman, Arizona, following a fire that broke out as propane was being transferred from a railroad car to a storage tank, Kingman Explosion known as kills eleven firefighters.
10th July » The Bahamas gain full independence within the Commonwealth of Nations.
10th July » National Assembly of Pakistan passes a resolution on the recognition of Bangladesh.
10th July » John Paul Getty III, a grandson of the oil magnate J. Paul Getty, is kidnapped in Rome, Italy.
11th July » Varig Flight 820 crashes near Paris, France on approach to Orly Airport, killing 123 of the 134 on board. In response, the FAA bans smoking on flights.
12th July » A National Personnel Records Center fire known as fire destroys the entire sixth floor of the National Personnel Records Center of the United States.
13th July » Alexander Butterfield reveals the existence of the "Nixon White House tapes Nixon tapes" to the special United States Senate Senate committee investigating the Watergate scandal Watergate break in.
16th July » Watergate scandal: Former White House aide Alexander Butterfield informs the United States Senate that President of the United States named President Richard Nixon had secretly recorded potentially incriminating conversations.
17th July » King Mohammed Zahir Shah of Afghanistan is deposed by his cousin Mohammed Daoud Khan while in Italy undergoing eye surgery.
21st July » In the Lillehammer affair in Norway, Israeli Mossad agents kill a waiter whom they mistakenly thought was involved in the 1972 Munich massacre known as Munich Olympics Massacre.
25th July » Soviet Union or Soviet 'Mars program e.g Mars 5' space probe is launched.
28th July » Summer Jam at Watkins Glen: Nearly 600,000 people attend a rock festival at the Watkins Glen International Raceway.
29th July » Greek republic referendum, 1973 or Greeks vote to abolish the monarchy, beginning the first period of the Metapolitefsi.
29th July » During the 1973 Dutch Grand Prix known as Dutch Grand Prix driver Roger Williamson was killed in the race, after a suspected tire failure caused the car to pitch into the barriers at high speed.
2nd August » A flash fire kills 51 at the Summerland disaster e.g Summerland amusement centre at Douglas, Isle of Man.
8th August » Kim Dae-jung, a South Korean politician and later president of South Korea, is Kidnapping of Kim Dae-jung known as kidnapped.
14th August » The Constitution of Pakistan named Pakistan Constitution of 1973 comes into effect.
15th August » Vietnam War: The United States bombing of Cambodia ends.
23rd August » A Norrmalmstorg robbery or bank robbery gone wrong in Stockholm, Sweden, turns into a hostage crisis; over the next five days the hostages begin to sympathise with their captors, leading to the term "Stockholm syndrome".
18th September » The Bahamas, East Germany and West Germany are admitted to the United Nations.
19th September » King Carl XVI Gustaf of Sweden has his investiture.
20th September » Billie Jean King beats Bobby Riggs in the Battle of the Sexes (tennis) known as Battle of the Sexes tennis match at the Houston Astrodome.
23rd September » Juan Perón returns to power in Argentina.
24th September » Guinea-Bissau declares its independence from Portugal.
26th September » Concorde makes its first non-stop crossing of the Atlantic in record-breaking time.
5th October » Signature of the European Patent Convention.
6th October » Egypt launches a coordinated attack with Syria against Israel leading to the Yom Kippur War.
8th October » Greek military junta of 1967–1974: Junta strongman George Papadopoulos appoints Spyros Markezinis as Prime Minister of Greece with the task to lead Greece to parliamentary rule.
10th October » Vice President of the United States Spiro Agnew resigns after being charged with federal income tax evasion.
14th October » In the Thammasat student uprising over :th:เหตุการณ์ 14 ตุลา or 100,000 people protest in Thailand against the Thanom Kittikachorn called Thanom military government; 77 are killed and 857 are injured by soldiers.
16th October » Henry Kissinger and Le Duc Tho are awarded the Nobel Peace Prize.
17th October » OPEC starts an petroleum known as oil embargo against a number of western countries, considered to have helped Israel in its war against Syria.
19th October » President Richard Nixon rejects an Appeals Court decision that he turn over the Watergate tapes.
20th October » "Saturday Night Massacre": President of the United States President Richard Nixon fires United States Attorney General U.S. Attorney General Elliot Richardson and United States Deputy Attorney General Deputy Attorney General William Ruckelshaus after they
20th October » The Sydney Opera House opens.
21st October » Fred Dryer of the then St. Louis Rams e.g Los Angeles Rams becomes the first player in National Football League e.g NFL history to score two safeties in the same game.
23rd October » The Watergate Scandal: US President Richard M. Nixon agrees to turn over subpoenaed audio tapes of his Oval Office conversations.
23rd October » A United Nations sanctioned cease-fire officially ends the Yom Kippur War between Israel and Syria.
27th October » The Cañon City, Colorado called Cañon City meteorite, a 1.4 kilogram called kg chondrite type meteorite, strikes in Fremont County, Colorado.
30th October » The Bosphorus Bridge in Istanbul, Turkey is completed, connecting the continents of Europe and Asia over the Bosphorus for the second time.
31st October » 1973 Mountjoy Prison helicopter escape named Mountjoy Prison helicopter escape. Three Provisional Irish Republican Army members escape from Mountjoy Prison, Dublin, Republic of Ireland aboard a hijacked helicopter that lands in the exercise yard.
1st November » Watergate Scandal: Leon Jaworski is appointed as the new Watergate Special Prosecutor.
1st November » The Indian state of Mysore is renamed as Karnataka to represent all the regions within Karunadu.
3rd November » Mariner program: NASA launches the 'Mariner 10' toward Mercury (planet) called Mercury. On March 29, 1974, it becomes the first space probe to reach that planet.
4th November » The Netherlands experiences the first Car Free Sunday caused by the 1973 oil crisis. Highways are deserted and are used only by cyclists and roller skaters.
8th November » The right ear of John Paul Getty III is delivered to a newspaper together with a ransom note, convincing his father to pay US$2.9 million.
14th November » In the United Kingdom, Anne, Princess Royal or Princess Anne marries Captain (British Army and Royal Marines) or Captain Mark Phillips, in Westminster Abbey.
16th November » Skylab program: NASA launches 'Skylab 4' with a crew of three astronauts from Cape Canaveral, Florida for an 84-day mission.
16th November » U.S. President Richard Nixon signs the Trans-Alaska Pipeline Authorization Act into law, authorizing the construction of the Alaska Pipeline.
17th November » Watergate scandal: In Orlando, Florida, U.S. President Richard Nixon tells 400 Associated Press managing editors "I am not a crook."
17th November » The Athens Polytechnic uprising against the military Greek military junta of 1967–1974 known as regime ends in a bloodshed in the Greek capital.
22nd November » The Italian Fascist organization Ordine Nuovo is disbanded.
24th November » A national speed limit is imposed on the Autobahn in Germany because of the 1973 oil crisis. The speed limit lasted only four months.
27th November » Twenty-fifth Amendment to the United States Constitution known as Twenty-fifth Amendment: The United States Senate votes 92 to 3 to confirm Gerald Ford as Vice President of the United States. (On December 6, the United States House of Representatives call
1st December » Papua New Guinea gains self-governance from Australia.
3rd December » Pioneer program: Pioneer 10 sends back the first close-up images of Jupiter.
6th December » Twenty-fifth Amendment to the United States Constitution known as The Twenty-fifth Amendment: The United States House of Representatives votes 387 to 35 to confirm Gerald Ford as Vice President of the United States. (On November 27, the United States Sena
9th December » British and Irish authorities sign the Sunningdale Agreement in an attempt to establish a power-sharing Northern Ireland Executive (1974) known as Northern Ireland Executive and a cross-border Council of Ireland.
15th December » John Paul Getty III, grandson of American billionaire J. Paul Getty, is found alive near Naples, Italy, after being kidnapped by an Italian gang on July 10.
15th December » The American Psychiatric Association votes 13–0 to remove homosexuality from its official list of Mental disorder named psychiatric disorders, the Diagnostic and Statistical Manual of Mental Disorders called DSM-II.
18th December » Soyuz programme or Soviet Soyuz Programme: 'Soyuz 13', crewed by List of cosmonauts e.g cosmonauts Valentin Lebedev and Pyotr Klimuk, is launched from Baikonur in the Soviet Union.
18th December » The Islamic Development Bank is founded.
20th December » The Prime Minister of Spain, Admiral Luis Carrero Blanco, is assassinated by a car bomb attack in Madrid.
21st December » The Geneva Conference (1973) called Geneva Conference on the Arab–Israeli conflict opens.
24th December » District of Columbia Home Rule Act is passed, allowing residents of Washington, D.C. to elect their own local government.
28th December » The Endangered Species Act is passed in the United States.