The terms ‘English School’ (ES) and ‘international security’ seldom appear in the same sentence. Yet the ES can and should constitute a general approach to International Security Studies (ISS) comparable to realism, liberalism, constructivism and several other approaches to International relations (IR). The article begins by sketching out how the ES’s idea of raison de systeme provides a general framing for ISS that counterpoints approaches focused on raison d’etat. It then shows how the ES’s societal approach provides specific insights that could strengthen analysis of international security: by providing a normative framing for securitization, by showing the historical variability of key ISS concepts such as war, balance of power and human rights, by adding an inside/outside dimension to security relations based on differentiations within international society, and by complementing regional approaches to international security with its societal approach. The article aims to initiate a conversation betwe...