This qualitative study assessed clients' participation in organizational decision making in a public long-term psychiatric hospital. Numerous examples were found in which clients meaningfully participated in the decision-making process and achieved favorable policy changes. Three means of involving clients were found to be especially useful: (1) using a consumer council, (2) involving clients in the formal policy review process, and (3) including clients in the hospital's performance improvement system. The authors offer guidelines for mental health organizations wishing to promote client participation in organizational decision making. Implications for social work are discussed.