Iran's prison system is a foundational institution of Iranian political modernity. The Incarcerated Modern traces the transformation of Iran from a decentralized empire with few imprisoned persons at the turn of the twentieth century into a modern nation-state with over a quarter million prisoners today. In policing the line between "bad criminal" and "good citizen," the carceral system has shaped and reshaped Iranian understandings of citizenship, freedom, and political belonging. This talk will explore the history of these transformations and analyze the interplay between the concrete space of the Iran prison and the role of prisons in producing new public cultures and political languages in Iran.