The memory regimes concept is key to developing the subdiscipline of memory politics by helping us grasp how societies structure, institutionalize, and discipline collective memory. Unlike the ambiguous notion of collective memory, the concept of memory regimes can illuminate—in a theoretically sophisticated fashion—the institutions, actors, and legitimation mechanisms at play. These mechanisms help narratives of the past gain authority in public life. This entry traces the emergence and theoretical development of the memory regimes concept. It underscores the importance of expertise, institutional infrastructure, and of surmising political interests and identities for a fuller understanding of the phenomenon. It then reflects on the principal forces of change in memory regimes, particularly transnationalization and grassroots activism. Ultimately, this entry calls for treating memory regimes not only as sites of narrative production and contestation but also as sociopolitical networks of power and expertise that feed into political identities.