This book explores the evolution of violent extremism in Southeast Asia, charting its development from the 2001 discovery of the Jemaah Islamiyah plot linked to Al Qaeda in Singapore, to the rise of ISIS in the mid-2010s, and the emergence of new forms of extremism such as white supremacist, Hindu, and Buddhist extremism in the 2020s. It provides a comprehensive look at how these threats have shaped both regional and global security landscapes.