AimThis study aims to explore the relationship between self-efficacy, emotional autonomy, and diabetic control index in adolescents with type 1 diabetes. MethodsFrom January to September 2023, this cross-sectional study involved 112 adolescents aged 14–18 with type 1 diabetes who were seeking medical check-ups at the Medical Faculty Hospital in Konya, Turkey. Data collection included demographic information, the Diabetes Management Self-Efficacy Scale for Adolescents with Type 1 Diabetes, the Emotional Autonomy Scale, and diabetic control index values based on their most recent Hemoglobin A1c levels measurement. Data analysis was performed using SPSS statistical software, with statistical significance set at a p-value <0.05. ResultsThe results showed a good overall self-efficacy score, indicating a balanced level of confidence in diabetes management. The emotional autonomy findings revealed a moderate level of independence, emphasizing a healthy process of differentiation from parents while acknowledging them as individuals. The ability of adolescents to openly discuss their diabetes may be associated with more favorable glycemic outcomes. However, high emotional autonomy was significantly associated with high Hemoglobin A1c levels. ConclusionThis study highlights positive outcomes in adolescent diabetes management, with strong self-efficacy and balanced emotional autonomy. Open communication about diabetes correlates with favorable glycemic outcomes, but caution is necessary as high emotional autonomy is linked to elevated Hemoglobin A1c levels. The importance of receiving parental support in managing diabetes, especially in adolescents with high emotional autonomy should be highlighted.