This preregistered meta-analytical review explored the construct validity and scope of the Quiet Ego (QE), a characteristic adaptation theorized to positively impact individual, societal and environmental well-being. The literature search in PsycInfo, ERIC and PubMed, conducted in July 2024, encompassed published and un-published original empirical data in English reporting standardized effect sizes for the bivariate relationship between the QE and various aspects of psychosocial functioning. In total, 273 zero-order Pearson correlations from 26 studies involving 13,391 participants were synthesized applying robust variance estimation. Results of visual and statistical analyses collectively indicate minimal evidence for publication bias. Accounting for the effect size direction of negative indicators of psychosocial functioning, the overall effect size was statistically significant and large in magnitude (r+ = 0.332, 95% CI [0.282, 0.380]). This suggests a substantial correlation between the QE and psychosocial qualities considered to promote healthy functioning in a world with others. A moderating effect was found for culture, but not for age or gender. Utilizing an organizational framework for human flourishing allowed for more nuanced insights. The findings showed that the QE aligns positively with flourishing-promoting facets of desire, wisdom and well-being. Thus, the present study underscored the broad relevance of the QE. Main limitations identified include limited variability in sample and study characteristics and a lack of data on moderator variables. Particularly, there is a need for further experimental research to causal-ly validate whether the QE truly acts as a pathway to individual and collective human flourishing.