The aim of the study was to investigate the knowledge of community mental health nurses regarding their role and responsibility. 30 community mental health nurses were surveyed by adopting simple random sampling. A pre & post check list was prepared to assess the present facility and service at CHC and knowledge of the nurses, on Role and Responsibility of Community Mental Health Nursing. Result reveals that Majority 25(83.33%) were supported that they do not have information about role of Community mental health nursing. 24(80%) not participated in any program related to mental health whereas 93.33% supported that With the given information they are able to identify the patient of substance abuse and suicide in the community. Community health nurses found the knowledge effective and useful. Nurses require the necessary knowledge, skills and confidence to competently perform this role.