 Actor interface analysis is a methodological entry point to study the gap between policy as promised and policy as practiced. It focuses on the interactions between different actors involved in the process of implementing a policy, and how those interactions shape the outcomes of the policy. This approach has rarely been used in health policy analysis, so this paper aims to synthesize existing knowledge about its application in health policy implementation and provide guidelines for conducting actor interface analysis. This article was authored by Rakesh Parasher, Nilesh God, and Lucy Gilson.