Combating incitement to terrorism poses operational, constitutional and human rights challenges on many fronts, both domestically and internationally. What is incitement? Where should the line be drawn between protected speech and incitement that should be criminalized? Does war change the calculus of what are appropriate and lawful measures to contain and respond to such incitement? And, how does social media and the nature of communication and engagement in our virtual world change or complicate how we think about, and can respond to, incitement? This compilation offers expert analysis on incitement to terrorism across these challenging issues and questions. The contributors bring expertise from a range of countries and operational experiences, providing an illuminating and thought-provoking examination of domestic and international law, comparative approaches, and emerging trends with respect to incitement to terrorism.