A guide to learning about livelihood impacts of REDD+ projects is a resource for REDD+ stakeholders to undertake rigorous evaluation of the social welfare impacts of REDD+ projects. Despite decades of environment and development initiatives, we remain without a solid understanding of the direct social welfare impacts of most conservation oriented projects, and what underlying causal mechanisms link observed outcomes to intervention activities. Given the nature of REDD+ as a results based conservation mechanism, we have a tremendous opportunity to learn about factors that lead to favorable social welfare outcomes. The diversity of REDD+ proponents and mechanisms for realizing co-bene!ts creates an opportunity to learn collectively about how to design and implement future REDD+ initiatives.