‘Security’ has for the most part been considered a special kind of politics by observers, as one that closes down inclusive policy-making and democratic debate. This Special Issue reviews theoretical and empirical developments at the intersections of ‘security’ and ‘politics’. It argues that research centering on the notion of politicization offers new ideas on how to addresses this complex and evolving conceptual tandem, and importantly, helps elucidate the growing range of actors, arenas and arguments factually visible in contemporary security affairs. The Special Issue develops a framework around the dimensions of controversy, mobilization and arena-shifting, and showcases the potential of such a perspective through empirical illustrations and theoretical examinations, covering issues such as post-Snowden public-policy controversy in Germany, lay participation in European security strategy-making, and the evolving role of the British parliament in UK security politics. The Special Issue’s ambition is to re-engage the relationship between security and politics, to inspire innovative new empirical work on ‘politics around security’, and to empower more differentiated inquiries into the ambivalent consequences of politicization.