This chapter develops a comprehensive typology for empirical analysis of legitimation and delegitimation practices in global governance. The framework is novel in three respects. First, while earlier literature has primarily studied legitimation, this classification encompasses both legitimation and delegitimation practices. Second, while most previous research has examined top-down legitimation practices by global governance institutions and their member states, this typology includes also bottom-up legitimation and delegitimation practices from various societal actors. Third, the framework captures a full variety of legitimation and delegitimation practices, classified in the chapter as being discursive, institutional, and behavioral in character. The chapter further identifies factors that may prompt variation in the kinds of (de)legitimation practices that different actors might adopt.