Daniel Hays Lowenstein (born May 10, 1943) is an emeritus professor at UCLA Law School and an expert in election law. He was appointed by California governor Jerry Brown as the first chairman of the California Fair Political Practices Commission in 1974 and was Jerry Brown's Chief Deputy Secretary of State. He was elected to the National Governing Board of Common Cause in 1979 and has been a board member and a vice president of Americans for Nonsmokers' Rights. He is also the co-author of the groundbreaking California Political Reform Act of 1974.