*This paper is not yet published.* A metacognitive learner acts in a planful way, monitors their progress, flexibly adapts their strategies, and reflects on their learning. Unsurprisingly, a metacognitive approach to learning is an important predictor of children’s academic performance and many attempts have been made to promote metacognition in school children. The current meta-analytic study evaluates the impact of such metacognition interventions on self-regulated learning as well as academic outcomes in typically developing pre- and elementary school children. Structural, content-related, and methodological moderators were tested, as well as the age of the children assessed. Results indicated that metacognition interventions effectively enhance children’s outcomes, both at immediate post-test and at follow-up. Interestingly, metacognition interventions were effective for children’s self-efficacy only at follow-up, suggesting that the positive impact of these interventions can unfold over a protracted period. For the first time, children’s executive functions were considered as outcome variables and results indicated a positive impact of metacognition interventions on these variables. One notable finding was that interventions that were delivered by teachers or task materials were more effective than interventions that were delivered by researchers for metacognition outcomes. This finding may reflect recent improvements in how teachers and researchers collaborate to develop intervention programs and is encouraging as it offers effective pathways to promote metacognition in school settings.