Typology development entails systematically clustering related attributes among individuals or groups to examine trends that might explain complex human interactions and behaviours. This approach has demonstrated its usefulness in behavioural sciences with important implications for policy, etiology, course, and treatment. Our review article provides an overview of terrorism typologies and examines their implications for clinical practice. We argue that the theoretical nature and heterogeneity of existing terrorism typologies limit their clinical usefulness, highlighting the need to develop empirically driven typologies.