The relationship between terrorist activities and states of emergency has never been explored in a cross-country perspective. This article is a first step to change that. Given that a terror act has been committed, what are the factors that lead governments to declare a state of emergency (SOE)—or refrain from declaring it? And given that a SOE has been declared, what are the effects thereof? On the basis of seventy-nine countries all having Western-style constitutions, we find that more terrorist incidents increase the likelihood of a SOE. Interestingly, emergencies are less likely to be declared in election years, supposedly because governments believe them to be unpopular. Once a SOE is declared, it generally leads to substantially more government repression. Finally, countries already under a SOE are more likely to suffer from additional terror attacks, challenging the effectiveness of states of emergency.