Purpose: This scoping review summarizes evidence on school-based interventions for preventing problematic internet use (PIU) among adolescents and identifies research gaps. Method: We systematically searched for studies from inception to February 27, 2025, targeting universal, selective, and indicated populations. A total of 35 studies were included (11 universal, 17 selective, 7 indicated). Results: Most studies were conducted in Asia. Across different levels of interventions—universal, selective, and indicated—there are different intervention goals, target populations, facilitators, implementation methods, and effect sizes. Nonetheless, most of them emphasized the importance of increasing awareness of the negative consequences of PIU, fostering appropriate attitudes and behaviors toward internet use, and teaching psychosocial skills for regulating internet use. Most interventions reported positive outcomes. Conclusion: School-based interventions are promising for preventing PIU. Future intervention studies should be extended to diverse regions, promote positive internet behaviors, integrate PIU in multi-risk frameworks, and enhance family and community involvement.
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