Forecasting the Fifth Wave: Emerging Terrorist Threats in a Changing World

Mahmut Cengiz 

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The international defense community consistently struggles to predict the changing landscape of global terrorism. Counterterrorism practitioners have frequently been reactive rather than proactive, while the academic community has faced challenges in developing models that reflect terrorism’s complex and dynamic nature. These deficiencies led to the failure to anticipate and prevent major terrorist incidents such as the September 11 attacks in 2001, the 2002 Bali bombings, 

the 2015 Paris attacks, and most recently, Hamas’s coordinated attacks on October 7, 2023. This article builds on David Rapoport’s theory of the “four waves” of terrorism to explore a potential “fifth wave.” Analysis of data from the Global Terrorism Trends and Analysis Center (GTTAC) indicates that the strongest candidates for this fifth wave are the continuation of the religious wave—especially the Salafi-jihadist interpretation, and the activities of Iran-backed terrorist groups.

David Rapoport’s theory of the four waves of modern terrorism presents a typology grounded in political orientation and influenced by the historical, cultural, and ideological conditions of distinct periods characterized by heightened terrorist activity. A “wave” denotes a generational cycle of terrorism unified by a shared ideological drive, with revolutionary change serving as the central objective in each phase. Rapoport identifies four major waves: the Anarchist (1880–1920), Anti-Colonial (1920–1960), New Left (1960–1980), and Religious (1980–ongoing).

The first, the Anarchist Wave began in Russia and is widely recognized as the starting point of modern terrorism. It emerged from deep dissatisfaction with the slow pace of political reform, particularly frustration with entrenched authoritarian systems and the persistence of state power, which anarchists sought to dismantle in favor of stateless, egalitarian alternatives, and was characterized by the tactical use of dynamite and the assassination of high-ranking officials, including heads of state.