This large-scale research project examined mental health professionals' perspectives of their own, and service users' spirituality and mental health difficulties. Recent research has shown a relationship between mental health professionals' own beliefs around spirituality and that of service users. The initial part of the thesis reviews: the area of spirituality in mental health care, from both view point of the mental health professional and service user; models attempting to make a distinction between spirituality and psychosis; treatment incorporating a spiritual perspective and current and future training of clinical psychologists. The main focus of the review is clinical psychology and more serious mental illness, psychosis. The aim of the empirical paper was to investigate mental health professionals' perspectives of spirituality and psychosis. The study employed a postal questionnaire across three groups of mental health professionals: psychiatrists; nurses; and clinical psychologists. The main findings of the study were in line with the original hypotheses. Qualitative analysis was performed to enhance and enrich the quantitative data.