Background: Among adolescents, depressive symptoms commonly co-occur with social anxiety, with social anxiety often developmentally preceding depressive symptoms. Thus, evidence-based assessments of adolescent social anxiety should be augmented with assessments of depressive symptoms using measures that can be administered across developmental transitions (e.g., adolescence into adulthood). Objective: The widely used self-report measure, Beck Depression Inventory-II (BDI-II), was designed to assess depressive symptoms among adolescents and adults. Yet, scarce work exists on the psychometric properties of BDI-II self-reports among adolescents, and we know of no prior study that tested the properties of BDI-II parent reports. Method: We examined the BDI-II within a mixed clinical/community sample of 89 adolescents and their parents, who each provided BDI-II reports about the adolescent. Further, adolescents completed self-reports and parents provided reports of adolescents on measures of adolescent trait social anxiety and other associated features of adolescent depressive symptoms (e.g., parent-adolescent conflict; attention-deficit/hyperactivity disorder symptoms). Adolescents self-reported their state arousal within a 20-min mock social interaction period. Results: Parent-adolescent dyads displayed low-to-moderate correspondence between their BDI-II reports. Further, adolescents' and parents' BDI-II reports related to measures of associated features of adolescent depressive symptoms, and established cut scores on the BDI-II significantly distinguished adolescents on these same features. Adolescents' BDI-II reports predicted adolescents' self-reported arousal within social interactions and distinguished adolescents on referral status. Conclusions: Adolescents and parents can provide psychometrically sound reports on the BDI-II. These findings have important implications for evidence-based assessments of adolescent depressive symptoms, when clinically assessing adolescent social anxiety.