Jill R. Horwitz (born 1966) is Professor of Law at the UCLA School of Law and Associate Director of the Center for Law and Economics at UCLA. She is a leading expert on health law, economics, and policy as well as the law of nonprofit organizations. Horwitz is also a Research Associate at the National Bureau of Economic Research, Reporter at the American Law Institute, Adjunct Professor of Economics at the University of Victoria, Victoria, British Columbia of Canada, and a member of the Board of Advisors of the New York University National Center on Philanthropy and the Law.