Abstract: The author uses his personal and professional experience to explore the application of Cognitive Behavioural Therapy in caring for people who experience psychosis. Psychosis can be a life-threatening illness; about one in ten young men with psychosis will take their own lives. Much of the progress in treatment has been predicated on a biological explanation of psychosis. The late 1990s have seen increasing interest in psychological approaches in the treatment of psychosis; not withstanding that this treatment does not work for all people. The first aim of this research report is to develop understanding about Cognitive Behavioural Therapy, through exploration of its origins and examining the theoretical basis and reviewing the evidence that may support its use. The second aim is to explore the evidence around mental health nurses' training and use of Cognitive Behavioural Therapy, by critically examining some of the major UK and Australian reports. The author considers that Cognitive Behavioural Therapy is theoretically and pragmatically compatible with contemporary nursing practice, and will have increasing prominence for New Zealand mental health nurses.