Claudio Mauricio Grossman Guiloff (born November 26, 1947) is a lawyer and law professor. From 1995 until the summer of 2016, he served as dean of the Washington College of Law of American University in Washington, D.C. He continues to teach at the Washington College of Law and serve as Dean Emeritus. In November 2016, he was elected to the United Nations International Law Commission (ILC) for a five-year term. He was reelected to the ILC in 2021. In November 2021, he was also appointed Advisor without Portfolio to the Prosecutor of the International Criminal Court.