Consumer participation has been a major focus in mental health services in recent years, but the attitudes of mental health professionals towards this initiative remain variable. The purpose of this study was to describe mental health professionals' attitudes towards mental health consumer participation in inpatient psychiatric units. The Consumer Participation and Consultant Questionnaire was used with a non-probability sample of 47 mental health professionals from two adult inpatient psychiatric units situated in a large Australian public general hospital. Ethics approval was obtained from a university and a hospital ethics committee. Data were analysed using SPSS, Version 12. Overall, respondents had favourable attitudes towards consumer participation in management, care and treatment, and mental health planning. They were less supportive about matters that directly or indirectly related to their spheres of responsibility. The type of unit that the respondents worked in was not a factor in their beliefs about consumer participation. Recommendations are made about the development of guidelines for consumer participation in inpatient units, the educational preparation of mental health clinicians, and the need for mental health professionals to reflect on, and discuss their own beliefs and practices about, consumer participation.