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Overall, community engagement interventions are effective in improving health behaviours, health consequences, participant self-efficacy and perceived social support for disadvantaged groups. There are some variations in the observed effectiveness, suggesting that community engagement in public health is more likely to require a ‘fit for purpose’ rather than ‘one size fits all’ approach. We identified trends in the evidence that could provide useful directions for future intervention design and evaluation. Although there is a trend to suggest that there is greater effectiveness of peer-/lay-delivered interventions than interventions that take an empowerment approach or those that involve community members in the design of the intervention, this finding was not statistically significant. We cannot, therefore, conclude that one particular model of community engagement or theory of change is clearly more effective than any other. Albeit from a small number of studies, there also appear to be gains to human and social capital. There is evidence of benefits for engagees, including skills acquisition and future employment. Also, there is evidence that interventions improve participants’ perceived social support. There is weak but inconsistent evidence that different types of community engagement interventions can be cost-effective, and that implementation factors may affect intervention success. The new conceptual framework and the identification of three main theories of change can be used in intervention design and evaluation. Community engagement interventions need evaluations to include long-term assessment; the full range of potential beneficiaries …