This comprehensive work systematically describes Wilfred Bion's work on psychosis and critically develops his contribution in order to arrive at an appropriate and modern understanding of the disorder. The book provides deep insights into the psychoanalytic treatment of psychotic patients through comprehensive analysis of key concepts including the alpha function, the failure to dream, and psychic retreat. It bridges theoretical understanding with clinical application, examining how psychotic minds function as sensory organs rather than thinking apparatus, and offers practical guidance for therapeutic work with severely impacted patients. The text critically evaluates both the achievements and limitations of Kleinian approaches while presenting fresh perspectives on childhood withdrawal and delusional structure formation. Bion and Psychosis is essential reading for psychoanalysts, psychiatrists, clinical psychologists and mental health professionals working with psychotic patients. It serves as an invaluable resource for trainees, postgraduate students and researchers in psychoanalysis, particularly those studying Kleinian theory, Bion's work or severe mental disorders.