Psychosocial integration occupies a pivotal position in the depth-psychology and addiction literature, where it functions not merely as a descriptor of social adjustment but as an ontological necessity—a condition without which human wholeness is impossible. Bruce K. Alexander, its most systematic contemporary theorist, draws the concept from Erikson’s developmental psychology while extending it into a comprehensive account of addiction as dislocation’s sequela. For Alexander, psychosocial integration names the achieved balance between individual autonomy and social belonging; its sustained absence—dislocation—generates the existential anguish that addiction compensates. Alexander’s genealogy of the concept is notably broad, tracing cognate formulations through Darwin, Kropotkin, Adler, Fromm, and Plato’s dikaiosynē, and noting that contemporary social science disperses the same idea across terms such as ‘belonging,’ ‘community,’ ‘social cohesion,’ and ‘culture.’ The concept carries explicit political valence: free-market society is indicted as the structural engine of dislocation. Gabor Maté aligns authenticity and attachment with Alexander’s formulation, treating psychosocial integration as both developmental aim and cultural norm. Erikson’s ‘ego identity’ stands as its most proximate ancestor. The term thus sits at the intersection of evolutionary anthropology, psychoanalytic developmental theory, political economy, and clinical practice—making it one of the more theoretically generative and contested constructs in the contemporary depth-psychology of suffering.