The association between dairy consumption in adults and the likelihood of type 2 diabetes mellitus (T2DM) has been described, but more information on the adolescent population is needed. This nationally representative, cross-sectional school-based aimed to describe the consumption of dairy products and their subtypes and to evaluate their association with pre-diabetes and T2DM in adolescents. The Study of Cardiovascular Risks in Adolescents (ERICA) includes adolescents aged 12-17 years. Dairy consumption was evaluated by 24-hour food recall. Associations with fasting glucose, glycated hemoglobin (HbA1c), and insulin resistance, as measured by HOMA-IR, were evaluated by multivariate linear regression. Poisson regression was also used to assess the association between dairy consumption and the combined prevalence of prediabetes and T2DM. Models were adjusted for sociodemographic, nutritional, behavioral, and anthropometrics. The final sample analyzed consisted of 35,614 adolescents. Total intake of dairy products was inversely associated with fasting blood glucose levels after adjusting for all covariates (β= -0.452, 95%CI -0.899; -0.005). The associations were stronger for overweight and obese adolescents. Findings were similar for full-fat dairy and yogurt. Higher consumption of low-fat dairy products and cheese were associated with a 46% (PR 1.46, 95%CI 1.18; 1.80) and 33% (PR 1.33, 95%CI 1.14; 1.57) higher combined prevalence of prediabetes and T2DM, respectively. The total consumption of dairy products and full-fat dairy products was associated with a lower combined prevalence of prediabetes and T2DM, while the consumption of cheese and low-fat dairy products was associated with higher combined prevalence of prediabetes and T2DM in Brazilian adolescents.