According to mindset theory, students who believe their personal characteristics can change-that is, those who hold a growth mindset-will achieve more than students who believe their characteristics are fixed. Proponents of the theory have developed interventions to influence students' mindsets, claiming that these interventions lead to large gains in academic achievement. Despite their popularity, the evidence for growth mindset intervention benefits has not been systematically evaluated considering both the quantity and quality of the evidence. Here, we provide such a review by (a) evaluating empirical studies' adherence to a set of best practices essential for drawing causal conclusions and (b) conducting three meta-analyses. When examining all studies (63 studies,