Social anxiety is a serious problem occurring in early adolescence characterized by a high level of worry, negative evaluation, and avoidance behavior in various social situations. The existence of fear, worry, and unconsciousness in recognizing negative thoughts that cause avoidance in adolescents with social anxiety problems can be overcome by providing CBT and Mindfulness therapy. This study aims to identify the effectiveness of Cognitive Behavior Therapy (CBT) and mindfulness therapy on adolescent social anxiety problems. this research is a research quasi-experimental pre-test post-test control group design. There were 40 participants in this study, namely 20 students in the control group and 20 students in the treatment group. The results obtained from this study were that there were differences in the effectiveness of giving CBT with a combination of CBT and mindfulness in adolescent social anxiety with a p-value of 0.002 (0.002 <0.05) which was marked by a decrease in the average score of social anxiety in the group given the CBT combination intervention and mindfulness were greater compared to adolescents who were only given CBT. So it can be concluded that the effectiveness of giving a combination of CBT and mindfulness is better than giving CBT to adolescents who experience social anxiety problems