Judith Pamela Butler (born February 24, 1956) is an American feminist philosopher and gender studies scholar whose work has influenced political philosophy, ethics, and the fields of third-wave feminism, queer theory, and literary theory.

In 1993, Butler joined the faculty in the Department of Rhetoric at the University of California, Berkeley, where they became the Maxine Elliot Professor in the Department of Comparative Literature and the Program in Critical Theory in 1998. They also hold the Hannah Arendt Chair at the European Graduate School (EGS).

Butler is best known for their books Gender Trouble: Feminism and the Subversion of Identity (1990) and Bodies That Matter: On the Discursive Limits of Sex (1993), in which they challenge conventional, heteronormative notions of gender and develop their theory of gender performativity. This theory has had a major influence on feminist and queer scholarship. Their work is often studied and debated in film studies courses emphasizing gender studies and performativity.

Butler has spoken on many contemporary political questions, including Israeli politics and in support of LGBTQ rights.