Janet Elizabeth Halley (born February 1952) is an American legal scholar in the traditions of critical legal studies, legal realism and postmodernism. A self described feminist, she is known for her critique of American feminism, dominance feminism and left legalism, as well as her work on family law and the regulation of sexuality. She has also been a prominent voice in the public debate regarding sexual conduct codes on campuses in the United States in recent years, arguing against the broadening of the definition sexual assault and the adoption of the affirmative consent standard. She was the first expert on gender and sexuality in the legal system to receive a position at Harvard University and is the Royall law professor at Harvard Law School.