Jacques Lacan and Michel Foucault are often cast as intellectual adversaries, their legacies marked by differences in method, lineages, and analytical priorities. Yet beneath their distinct projects lies a shared ambition: to decenter the Western conception of the subject while critically engaging with the notion of subjectivity in post-Kantian thought.This book examines Foucault s critical project through the lens of Lacan s theory of the four discourses, introduced in Seminar XVII: The Other Side of Psychoanalysis (1969-70). Divided into two parts, Reading Foucault through Lacan unfolds as a dialogue between the discourses of the Hysteric and the Analyst. Part I, The Hysteric, reframes Foucault s genealogical critique from the early to mid-1970s as a form of hysterical questioning directed at Kant s transcendental legacy and its aftermath. Through an exploration of how violence and embodied resistance interact in a discursive framework, Part I uncovers the epistemological fractures that mark the modern subject.Part II, The Analyst, examines Foucault s redefinition of Kantian critique as a historically situated engagement with the present. Building on Lacan s claim that analytic experience begins with the hystericization of discourse, this section views Foucault s re-alignment with Kant as retroactively constituting the transformation from Hysteric to Analyst. Addressing themes such as parrhesia, transference, and the ethics of speaking, Part II examines discourse as a social link that transcends fixed identities to inhabit new modes of being.Drawing on newly available English translations of Foucault s lectures and Lacan s seminars, this book bridges two key trajectories in French thought and offers valuable insights for scholars of psychoanalysis, critical theory, and social philosophy.