Humanistic psychotherapy is internationally recognized as the fourth fundamental orientation of psychotherapy alongside behavioral therapy, psychodynamic psychotherapy, and systemic therapy. The humanistic methods are united by their shared view of humanity, their fundamental concepts, and the design of the therapeutic relationship. Notable representatives of person-centered psychotherapy, Gestalt therapy, body psychotherapy, psychodrama, transactional analysis, existential analysis/logotherapy, as well as integrative approaches such as person-centered systems theory and integrative therapy describe their approaches. They detail both the overarching theoretical principles and the diversity of their specific concepts and practical methods, illustrating them with case vignettes. The empirical evidence.