Based on information gathered from the internationally used Spiritual Needs Questionnaire, this book offers analyses of the spiritual and existential needs among different groups of people such as the chronically ill, elderly, adolescents, mothers of sick children, refugees, patients' relatives, and others. The theoretical background, specific empirical findings and the relevance of addressing spiritual needs is discussed by experts from different professions and cultural contexts. Supporting a person's spiritual needs remains an important task of future healthcare systems that wish to more comprehensively care for the healthcare needs of patients, and of religious communities to ensure that spiritual concerns of all persons, independent of their religious orientations, are met in and outside healthcare settings.