The psychology of self is the study of either the cognitive, conative or affective representation of one's identity or the subject of experience. The earliest formulation of the self in modern psychology derived from the distinction between the self as I, the subjective knower, and the self as Me, the object that is known.

Self psychology, a modern psychoanalytic theory and its clinical applications, was conceived by Heinz Kohut in Chicago in the 1960s, 70s, and 80s, and is still developing as a contemporary form of psychoanalytic treatment. In self psychology, the effort is made to understand individuals from within their subjective experience via vicarious introspection, basing interpretations on the understanding of the self as the central agency of the human psyche. Essential to understanding self psychology are the concepts of empathy, selfobject, mirroring, idealising, alter ego/twinship and the tripolar self. Though self psychology also recognizes certain drives, conflicts, and complexes present in Freudian psychodynamic theory, these are understood within a different framework. ""Self Psychology"" was seen as a major break from traditional psychoanalysis and is considered the beginnings of the relational approach to psychoanalysis.