Objective: This study aimed to identify factors predicting diabetes self-management among adults with type 2 diabetes mellitus in Malang City,East Java,Indonesia.Methods: A cross-sectional design was used in this study.Participants were selected from five primary health centers in Malang City,East Java,Indonesia using the multistage sampling method.A total of 127 adults with type 2 diabetes mellitus were recruited.Data were collected by questionnaires which were the general diabetes knowledge,the Beliefs of Treatment Effectiveness,the Diabetes Distress Scale,the Self-efficacy for Diabetes Scale,the brief Chronic Illness Resources Survey,the Situational Questionnaire and the Summary of Diabetes Self-care Activities.A self-administered questionnaire was used to collect the data.Multiple linear regression with stepwise method was used toanalyze the data.Results: The scores of seven questionnaires (i.e,diabetes knowledge,perceived benefit of diabetes self-management,diabetes distress,perceived self-efficacy,social support,situational influence,and diabetes self-management) were 13.75 ± 3.59,34.9 ± 4.89,3.03 ± 0.86,3.60 ± 0.53,27.79 ± 5.56,3.27 ± 0.58,3.81 ± 1.08,respectively.The significant predictors of diabetes self-management were treatment,perceived self-efficacy,and situational influences.These variables explained 20.8％ (adjusted R2 =0.208) of the variance in diabetes self-management among adults with type 2 diabetes mellitus in Malang City.Conclusion: Diabetes self-management among adults with type 2 diabetes mellitus could be improved by enhancing their perceived self-efficacy to achieve their self-management behavior,such as having a healthy diet,exercising regularly,actively monitoring blood glucose level,taking medication and foot care,and providing support to promote good situational influence.