This chapter explores Michel Foucault’s impact on the history of sexuality by emphasizing the disparate and evolving nature of his work and its often-controversial influence on the history of sexuality as a field. The essay begins by summarizing the arguments of the four volumes of Foucault’s History of Sexuality, while recalling the project’s turbulent history. The first volume maintained that sexuality’s history in the West was characterized by an “incitement to discourse” (rather than repression) which sealed the “Faustian pact” between sexuality and the pursuit of truth, while also drawing sexuality into power relations. Yet Foucault’s interest in early Christian sexual practices led him to reorient his project towards an exploration of classical antiquity and the role played by sexuality in practices of subjectivity. The essay’s second part examines how historians of sexuality have drawn on Foucault’s insights, focusing on the divergences between historians influenced by Foucault’s first volume (dealing with knowledge and power) and those inspired by the latter volumes (prioritizing subjectivity). After examining Foucault’s impact on feminism and queer theory, the essay concludes by noting that many historians of sexuality have made productive use of Foucault’s work without concurring with his philosophical conclusions.