List of terrorist incidents, 1973
The following is a timeline of acts and failed attempts that can be considered non-state terrorism in 1973.
- United States, January 7: After shooting a police officer a week earlier, Mark Essex, a former Black Panther party member, shot nineteen people (ten of them police officers) in retaliation for police killings at a Howard Johnsons hotel in New Orleans. In addition, he also set fires in the hotel before being killed by police.
- United States: A New York City transit detective is killed and ten law enforcement personnel are shot, four by machine gun, during the year mostly in and around New York City by the Black Liberation Army. Also two members of that organization are arrested with a car full of explosives. In the next few years there are a number of violent incidents involving this organization but they are more criminal in nature.
- Sudan, March 1: Black September takes ten hostages (five of them diplomats) at the Saudi Arabian embassy in Khartoum. Three western diplomats are killed.
- Italy, April 16: Primavalle Fire, 3 activists of Potere Operaio burned the house of a militant of the Italian Social Movement and killed his two sons.
- Italy, May 17: Gianfranco Bertoli, an anarchist activist, supporter of Max Stirner, attacked the Police headquarters in Milan, Italy with a Hand grenade during a commemorative ceremony with the Italian Prime Minister Mariano Rumor. 
- United Kingdom, May 17: The IRA kills 5 British soldiers in a roadside bomb attack in Tullyvallen, Northern Ireland.
- USSR, September 1: A man blows himself up inside Lenin Mausoleum on Moscow's Red Square. Two women standing next to him also died.
- United Kingdom, September 10: The IRA set off bombs at London's King's Cross Station and Euston Station, injuring 21 people.
- Austria, September 28: Chopin-Express: Two Arab terrorists hijack the Chopin-Express from Moscow to Vienna at the East-West border in Marchegg. The train is often used by Jewish exilants from the USSR. The terrorists demand the closure of an Austrian transit camp for Jews on their way to Israel. Chancellor Bruno Kreisky (Jewish himself) complies and allows the terrorists to escape to Libya.
- France, December 14: The Algerian consulate in Marseilles was bombed by the anti-Arab Charles Martel Group. Four people were killed and another twenty were injured in the bombing.
- Italy, December 17: Pan Am Flight 110: 30 passengers were killed when Palestinian guerillas threw phosphorus bombs aboard the aircraft as it prepares for departure.
- Spain, December 20: Prime Minister Admiral Luis Carrero Blanco is assassinated in Madrid by ETA.