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This meta-review integrates the current meta-analysis literature on the efficacy of internet-and mobile-based interventions (IMIs) for mental disorders and somatic diseases in children and adolescents. Further, it summarizes the moderators of treatment effects in this age group. Using a systematic literature search of PsycINFO and MEDLINE/PubMed, we identified eight meta-analyses (N= 8,417) that met all inclusion criteria. Current meta-analytical evidence of IMIs exists for depression (range of standardized mean differences, SMDs=. 16 to. 76; 95% CI:–. 12 to 1.12; k= 3 meta-analyses), anxiety (SMDs=. 30 to 1.4; 95% CI:–. 53 to 2.44; k= 5) and chronic pain (SMD=. 41; 95% CI:. 07 to. 74; k= 1) with predominantly nonactive control conditions (waiting-list; placebo). The effect size for IMIs across mental disorders reported in one meta-analysis is SMD= 1.27 (95% CI:. 96 to 1.59; k= 1), the effect size of IMIs for different …