This study aims to determine the relationship between peer social support and adolescents' mental health at SMP Negeri 1 Syamtalira Bayu. The research method used a quantitative design with a cross-sectional approach. The results of this study indicate that 85.1% (189 respondents) reported good peer social support, 75.2% (167 respondents) reported normal mental health, and 66.7% (148 respondents) reported good peer social support. The relationship between peer social support and adolescents' mental health at SMP Negeri 1 Syamtalira Bayu was significant, with a p-value of 0.000. Conclusion: There is an essential relationship between peer social support and adolescents' mental health.   Keywords: Social Support, Peers, Mental Health, Adolescents
                        
                        
                        
                        
                            
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