Individuals affected by humanitarian crises frequently suffer various severe and interrelated stressors such as losing their home, livelihoods, material belongings, and community or social support systems. A number of factors have been identified in the literature as making an individual more vulnerable to mental health problems following humanitarian crises. Mental health and psychosocial assessments in humanitarian contexts are still controversial. Interventions focused on mental health needs in the context of humanitarian crises can be conceptualized as a pyramid or a continuum of care ranging from non-specialized and community services designed to meet basic needs of an entire population, to specialized services for select individuals needing more specialized psychiatric care. This chapter looks in detail at three approaches to intervention that provide examples of what can be done in both preventive and treatment approaches to mental health.