Judith Butler is an American post-structuralist and feminist philosopher who has contributed to the fields of feminism, queer theory, political philosophy and ethics. They are currently a professor in the Rhetoric and Comparative Literature departments at the University of California, Berkeley.

Butler received their Ph.D. in philosophy from Yale University in 1984, for a dissertation subsequently published as Subjects of Desire: Hegelian Reflections in Twentieth-Century France. In the late-1980s they held several teaching and research appointments, and were involved in "post-structuralist" efforts within Western feminist theory to question the "presuppositional terms" of feminism.

Their research ranges from literary theory, modern philosophical fiction, feminist and sexuality studies, to 19th- and 20th-century European literature and philosophy, Kafka and loss, and mourning and war. Their most recent work focuses on Jewish philosophy and exploring pre- and post-Zionist criticisms of state violence.