This study evaluated the effectiveness of a culturally attuned group cognitive-behavior therapy (CBT) intervention for Chinese adolescents at risk for anxiety disorders in Hong Kong and the additive effects of parental involvement. A randomized controlled design was adopted. Assessments were gathered at pre- and posttreatment, and 6-month follow-up. Participants (N = 136) were randomly assigned to (a) CBT plus parental involvement (CBT-PI) (n = 46), (b) CBT (n = 45), and (c) social activity (n = 45) conditions. Data were analyzed according to the intention-to-treat principle using multilevel modeling. The CBT-PI condition showed a greater reduction in physical injury fears compared with the CBT condition. The current findings suggest that involving parents in CBT for Chinese adolescents with anxiety problems may provide a small improvement in treatment efficacy. (PsycInfo Database Record (c) 2020 APA, all rights reserved).