The enhancement of mental health is becoming an increasingly important public health issue. Anxiety disorders are the most common mental problems. In light of the scope of the problem, public health has the mandate to continuously monitor the evolution of these disorders and to ensure that the health care system serves the population appropriately, in terms of service availability, accessibility, continuity and effectiveness. Moreover, public health ensures that prevention and promotion programs are put in place to contend with risk factors and encourage individuals to adopt habits that promote good mental health. This article describes public health interventions in relation to anxiety disorders in Montreal.