Purpose: The purpose of this study was to develop an enneagram program and to investigate the effects of the enneagram program on self-esteem, interpersonal relationship and GAF(Global assessment of Functioning Scale) in psychiatric patients. Methods: A nonequivalent control group pre-post test design was used. Participants were 46 psychiatric patients. Participants were assigned to the experimental group(n=21) or control group(n=25). The experimental group participated in the enneagram program for 12 hours through eight sessions. The control group(n=25) received a routine nursing activity program. Results: The experimental group that participated in the enneagram program showed higher scores for self-esteem(t=3.73, p=.001), interpersonal relationship(t=2.63, p=.012) and GAF(t=2.43, p=.019) compared to the control group. Conclusion: The results indicate that an enneagram program for psychiatric patients is effective in improving self-esteem, interpersonal relationship and overall functioning skills. Therefore, it is suggested that an active use of this enneagram program as a nursing intervention for psychiatric patients would be beneficial.