This Introduction discusses why dissembling one’s faith in order to avoid religious persecution was, despite its ubiquity, such a contentious practice for the early moderns and how the controversies surrounding such dissimulation were informed by early modern views on lying. It further provides an account of the various points of contact between debates on the legitimacy of religious dissimulation and theatrical dissimulation, respectively, both of which were indebted to shared theological concerns. Plays that stage religious dissimulation as their subject matter are therefore also legible as meta-theatrical reflections on the political and religious implications of their medium. Finally, this Introduction provides an overview of scholarship on the early modern stage and its position vis-à-vis contemporary debates on conformity and nonconformity, which has frequently been thematised in the supposedly antagonistic relationship between the theatre and the Puritans. Arguably, however, the relationship between the stage and various contemporary positions on the question of religious dissimulation was more dynamic and unstable than previous scholarship has often suggested.