Emmanuel Levinas’ (1906–1995) philosophy offers a transformative paradigm for theoretical and philosophical psychology, instigating an “ethical turn” to the totalizing tendencies of orthodox clinical practice. This entry traces Levinas’ intellectual evolution—from his phenomenological foundations to his radicalization of ethics—highlighting core concepts such as the “Face,” “infinite responsibility,” and “substitution.” It examines how his phenomenologies of corporeality and temporality, caracterized by “radical passivity” and “diachronic trauma,” redefine subjectivity as constitutively tethered to the Other. Furthermore, this entry explores critical intersections with major theorists—including Freud, Jung, Winnicott, Lacan, and Rogers—and discusses his influence on relational psychoanalysis and the ethics of care. While acknowledging critiques regarding clinical feasibility and the “hyperbolic” nature of his thought, the entry concludes that Levinas provides a vital deconstructive force and a secure foundation for a human science of psychology centered on the vulnerability and absolute alterity of the Other.