Impact evaluation and measurement are highly complex and can pose challenges for both social impact providers and funders. Measuring the impact of social interventions requires the continuous exploration and improvement of evaluation approaches and tools. This article explores the available evidence on meta-evaluation--the "evaluation of evaluations"--as an analytical tool for improving impact evaluation and analysis in practice. It presents a systematic review of 15 meta-evaluations with an impact evaluation/analysis component. These studies, taken from both the scholarly and gray literature, were analyzed thematically, yielding insights about the potential contribution of meta-evaluation in improving the methodological rigor of impact evaluation and organizational learning among practitioners. To conclude, we suggest that meta-evaluation is a viable way of examining impact evaluations used in the broader social sector, particularly market-based social interventions.