The term ‘anal sadistic’ designates a pregenital libidinal organization in which the partial drives of anal erotism and sadism are fused, constituting what Freud identified as the stage immediately preceding genital primacy. Across the depth-psychology corpus, the term functions simultaneously as a developmental landmark, a diagnostic indicator, and an explanatory matrix for character formation and psychopathology. Freud establishes the foundational architecture: the sadistic-anal organization is governed by the polarity of active and passive rather than masculine and feminine, with mastery shading into cruelty and rectal erotism supplying the passive counterpart. Abraham elaborates this schema most systematically, subdividing the anal-sadistic stage into an earlier destructive and a later retentive phase, and deploying the distinction to differentiate obsessional neurosis from melancholia. His analysis of character formation demonstrates how anal-sadistic fixations underwrite traits of parsimony, obstinacy, orderliness, and ambivalence. Klein extends the framework into the earliest months of life, identifying anal-and urethral-sadistic attacks as foundational to destructive phantasy and persecutory anxiety. Horney, writing critically, acknowledges the tradition’s use of anal-sadistic regression to account for superego severity and self-hate, while questioning its sufficiency. Lacan repositions the anal dimension topologically, insisting on its irreducible role in the constitution of desire. The term thus traverses classical drive theory, object-relations, structural neurosis theory, and character analysis, remaining a site of genuine theoretical tension.