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There is an increasing interest in peer interventions in the management of chronic conditions, but evidence on peer interventions for body weight is lacking. The aim of this study was to examine the efficacy of peer interventions on body weight, energy intake, and physical activity in adults. Interventions delivered by peer (lay member that participants identify with) were included. We searched 14 databases. Outcomes were combined in the meta‐analysis using the inverse variance random‐effects model. From 2435 articles, 65 articles were included in the systematic review and meta‐analysis (n = 15,673). Peer interventions resulted in significant reduction in weight (mean difference [MD] −1.05 kg; 95% confidence interval [CI] −1.68, −0.43; 95% prediction interval [PI] −3.25, 1.14; 28 studies; 7142 participants), BMI (MD −0.24 kg/m²; 95% CI −0.44, −0.04; 95% PI −0.92, 0.45; 25 studies; 6672 participants), waist …