List of terrorist incidents: scope, classification, and compilation

Definition and inclusion criteria

There is no single universally accepted legal or scholarly definition of terrorism. Compilers of lists therefore adopt working criteria that may combine elements such as: the deliberate use of violence or threat of violence, political or ideological motivation, targeting of civilians or symbolic targets, and intent to influence an audience beyond the immediate victims. Decisions about whether an event qualifies can depend on available evidence, prosecutorial findings, and editorial judgment.

Typical categories and examples

Lists often group incidents by type, motive, or method. Common categories include:

• State and non-state actors: attacks by individuals, small groups or organized movements.
• Methods: bombings, shootings, vehicle rammings, hostage-taking, cyber-enabled attacks and suicide attacks.
• Motivations: religious extremism, ethno-nationalist separatism, left- or right-wing political violence, and single-issue terrorism.

History and development of lists

Systematic compilation of terrorist incidents expanded during the 20th century as governments and academics sought to quantify political violence. Modern databases combine open-source reporting, court records and government releases. Chronological lists are often presented year-by-year to show frequency, geographic distribution and changes in tactics over time.

Challenges and controversies

Compiling such lists faces several difficulties: differing definitions, biased or incomplete reporting, propaganda claims, and legal distinctions between terrorism and other crimes. Events may be reclassified as new information emerges. Transparency about inclusion rules and sources is important for credibility. For a maintained chronological compilation, see a representative chronological list of incidents.

Uses and importance

Well-documented incident lists support policy analysis, victim assistance, academic study and public awareness. They can inform prevention strategies and highlight vulnerable targets, but they must be used carefully to avoid inflating risks or stereotyping communities. Ongoing review and clear methodology improve their value for research and decision-making.