This research was motivated by the high hedonistic lifestyle of students at SMK N 1 Koto Baru. This research aims to examine the effect of group counseling with a CBT approach to reduce hedonistic behavior.The type of research used in this research is quantitative with experimental methods. The research design used was a pre-experiment design with a design namely one group pre-test-post-test design. The data collection technique used was a non-test technique for hedonistic behavior with SPSS 22 program data analysis. The population in the study was 60 students with random sampling, namely 10 students from class XI TBSM SMK N 1 Koto Baru who had high hedonistic behavior.The research results show that group counseling with a CBT approach has a significant effect in reducing hedonistic behavior with a significance level of 5%, namely 2.262. It can be concluded by comparing the magnitude of t obtained t0 18,79> t table 2.262, then as a reference or basis for decision making it can be concluded that the post-test results show a reduction in hedonistic behavior, which means that there is an influence of cognitive behavior therapy (CBT) group counseling in reducing behavior. hedonism among students at SMK N 1 Koto Baru Dharmasraya. Keywords: group counseling, cognitive behavior therapy (CBT), hedonistic
                        
                        
                        
                        
                            
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