The healthcare needs of migrants, refugees, and asylum seekers are important to assess and meet because the majority of migrants are of a young age group, which is more prone to developing psychiatric disorders, particularly in response to the stress of migration, which may act as a precipitating factor. In addition, their healthcare models and explanations can be strongly influenced by their cultural models. Many migrant groups show higher-than-expected rates of psychiatric disorders for a number of reasons. Combined with discrimination and stigma, it is likely that there may well be delays in seeking help, thereby making their prognosis poor. When planning, developing, and delivering services for migrant groups it is important to remember guidelines for good practice and also engage the groups appropriately. In this chapter we highlight differences in rates of psychiatric disorders, vulnerability factors, and healthcare needs of migrants, refugees, and asylum seekers.