Type 2 Diabetes Mellitus is a metabolic disorder characterized by hyperglycemia due to insulin resistance and impaired insulin secretion. Patient education plays a critical role in improving knowledge and glycemic control to prevent complications. This research aims to analyze the effect of education on improving knowledge of type 2 diabetes patients and its impact on glycemic control at Ngawi Regional Hospital. This research used a one-group pretest-posttest design involving 54 outpatients with type 2 diabetes mellitus. Data was used pretest and posttest questionnaires to assess knowledge changes and measured blood glucose levels before and after the education was provided. Data analysis was performed using T-Test and Wilcoxon Sign Rank Test with SPSS. The results indicate that there is no significant effect on patient knowledge after education, with a p-value of 0.07. Pretest and posttest scores showed a slight negative change. However, there was a decrease in random blood glucose levels from a high of 440 mg/dL to 370 mg/dL after education, indicating some improvement in glycemic control. In conclusion, this research indicated that education does not significantly improve knowledge or glycemic control in patients with type 2 diabetes. More intensive education is recommended to improve patient understanding.