1900–1949
- Ottoman Empire 1903: Members of the anarchistic group the Gemidzhii did the Salonica assassins.
- Morocco 1904, 18 May: Ion Perdicaris and Cromwell Varley kidnapped and ransomed by bandit Mulai Ahmed er Raisuli in Morocco.
- United States 1910, 1 October: Los Angeles Times bombing by a member of the International Association of Bridge and Structural Iron Workers Union killed 21 people and injured an additional 100.
- United States 1920, 16 September: Wall Street bombing killed 38 people and wounded 300 others.
- Romania 1921, 13 December: 100 soldiers and police officers were killed by a bomb thrown by Bessarabian separatists at the Bolgrad palace.
- Bulgaria 1925, 16 April: A group from the Bulgarian Communist Party blew up the roof of St. Nedelya Church in an assault during a funeral service, killing 150 people and injuring 500.
- British Mandate for Palestine 1937–1948: The Irgun are responsible for numerous attacks in British-mandated Palestine.
- Sweden 1940, 3 March: Politically motivated bombing targeted at the communist newspaper Norrskensflamman (Northern Flame) by various perpetrators. 5 persons were killed, 2 of which were children, along with 5 others injured.
- United States 1940–1956: George Metesky, the "Mad Bomber", placed over 30 bombs in New York City in public places such as Grand Central Station and The Paramount Theater, injuring ten during this period in protest against the local electric utility. He also sent many threatening letters.
- Romania 1947, 25 July: Three Romanian terrorists kill an aircrew member aboard a Romanian airline. This is attributed as the first hijacking that resulted in a fatality.
- Syria 1949, 5 August: 12 killed and dozens injured in the Menarsha synagogue attack, Damascus.
- Canada 1949, 9 September: 23 perish when a bomb explodes aboard a Quebec Airways Douglas DC-3 registration CF-CUA, travelling from Aéroport de l'Ancienne Lorette to Baie-Comeau Airport, and crashing in Sault-au-Cochon, Quebec after a man planted a bomb in order to claim his wife's life insurance policy.
Read more about this topic: List Of Terrorist Incidents