Diabetes mellitus is a non-communicable disease with a continuously increasing prevalence and the risk of serious complications if not properly controlled. Low public knowledge is one factor affecting the control of this disease. This community service activity aims to increase public knowledge and awareness regarding the prevention, recognition, and control of diabetes mellitus through PATUH behavior. The activity was carried out at the Kalimas Community Health Center in Pemalang Regency on May 24, 2025, targeting patients and visitors to the community health center. The implementation method included direct health education, distribution of leaflets as educational media, and a question and answer session. The material presented included the definition of diabetes mellitus, risk factors, symptoms, impacts of complications, and the application of PATUH behavior. The results of the activity showed a positive response and increased understanding of the participants regarding the material provided. In conclusion, this health promotion was effective in increasing public knowledge and encouraging independent efforts to prevent and control diabetes mellitus.