This chapter examines how ideas and concepts derived from criminology can inform our understandings of terrorism and counter-terrorism in insightful and innovative ways. Terrorism is designed as communicative violence that seeks to work by sending messages intended to influence the views of a wider public. The analysis attends to how terrorism has been constructed as a social and political problem in the contemporary era; the role attributed to extremism and processes of radicalization; and the extent to which these influence the framing and conduct of counter-terrorism responses, including financing terrorism. The particular perspective accents how terrorist campaigns and counter-terrorist responses routinely develop in interaction with each other.