Today, the state of emergency seems to be as permanent as it is omnipresent. The term became ubiquitous in the early twentieth century and continues to guide the self-description of contemporary societies. Yet, referring to ‘emergencies’ implies a large range of meanings, from actual states of war to moments of humanitarian crisis, from abstract realms of the law to concrete territories under siege. The lecture argues for a history of emergency experiences in the long twentieth century that reaches beyond ‘classical theories’ and focuses on the social dimensions of administrative agency instead. It treats the ‘state of emergency’ as an imaginary that informs technocratic practices and legal theory at the same time, and argues that historicizing it can help us to understand the critical role of the state apparatus in moments of transformation.