Past research has demonstrated that work engagement among health care professionals influences patient quality of care. There is, however, no estimate of the strength of this relationship, and existing reviews have not always explained conflicting findings. We conduct a meta-analysis and review of 25 articles, and find a small to medium mean effect size (r = .26, p < .01) for the positive association between engagement and quality of care. Moderator analyses on five factors (type, data source, level of analysis of the quality of care measure, profession, and work engagement measure) indicate that only data source is significant, providing preliminary evidence that the relationship is stronger if quality of care is measured via self-assessments. Although a more consistent conceptualization of quality of care is needed to better determine its association with work engagement, our findings suggest that work engagement is as important as burnout in predicting quality of care.