Blood glucose controlling and preventing complications of Diabetes Mellitus can only be achieved through every day implementation of self-management behaviors that include meals (diet) planning, physical exercise, (medication) therapy, blood glucose monitoring, and foot care. In reality, self-management behaviors are ot done routinely every day. One factor that can be a predictor is self-efficacy. The purpose of this research is to identify the relationship between self-efficacy and self-management behaviors of people with type 2 Diabetes Mellitus.Method: A cross-sectional research design was used in this study, and 112 persons with type 2 Diabetes Mellitus were recruited. The questionaire used in this study is The Diabetes Management Self Efficacy Scale (DMSES), Summary Diabetes Self Care Activity (SDSCA), and Diabetes Knowledge (DKN) Scale.Result: The results show the significant relationship between self-efficacy and self-management behaviors (p value < 0.001). People with type 2 Diabetes Mellitus with high self-efficacy can increase their self-management behavior.Conclusion: Therefore, nurses need to improve self-efficacy of people with type 2 Diabetes Mellitus by providing education about the management of Diabetes Mellitus, as well as supporting and motivating them.