Background <p>Type 2 diabetes (T2D) is a significant public health concern worldwide, with a notably high impact in India, where it markedly affects patients’ quality of life (QoL). Although the 19-item Audit of Diabetes-Dependent Quality of Life (ADDQoL-19) questionnaire is a recognized tool for evaluating diabetes’ impact on QoL, its psychometric properties have not been thoroughly assessed in the Indian population.</p> Objective <p>This study aims to evaluate the internal reliability and convergent validity of the Hindi version of the ADDQoL-19 questionnaire among Indian patients with T2D.</p> Methods <p>A cross-sectional study was conducted with 215 T2D patients who completed the Hindi versions of both the ADDQoL-19 and the EuroQoL-5 Dimension-5 Level (EQ-5D-5L) questionnaires. Descriptive statistics, Cronbach’s alpha for internal reliability, and Spearman’s correlation for convergent validity with the EQ-VAS scores were computed.</p> Results <p>Participants had a mean age of 45&#xa0;years, suggesting an earlier diabetes onset in this demographic. The ADDQoL-19 identified a significant negative impact on QoL, particularly in the “closest person relationship” domain. The Hindi version of ADDQoL-19 showed excellent internal consistency (Cronbach’s alpha = 0.92) and a strong positive correlation with EQ-VAS scores (r = 0.80, <i>p</i> &lt; 0.01), demonstrating high convergent validity.</p> Conclusion <p>The Hindi version of the ADDQoL-19 is a valid and reliable instrument for assessing QoL among Hindi-speaking T2D patients. Its integration into clinical settings is recommended for comprehensive and culturally sensitive patient care, which is crucial for enhancing individualized patient management and outcomes in India.</p>