Mr. and Mrs. Nathan Landow of Bethesda, Md. have made known the engagement of their daughter, Harolyn Sue, to Michael H. Cardozo, V, of Washington, D.C., the son of Mr. and Mrs. Michael H. Cardozo, also of this city. The wedding is planned for May 2 at the Washington Hebrew Congregation.

Miss Landow is marketing director of Ski Industries of America in this city. She is a fourth generation of her family in the Washington area and a graduate of Walt Whitman High School and Sophie Newcomb College of Tulane University. During the Carter Administration she was special assistant to Hamilton Jordan, Chief of Staff in the White House. Her father is the owner of Landow and Co., real estate developers of Bethesada, who has also served as United States Representatives to the United Nations.

Mr. Cardozo, an attorney, is a graduate of Phillips Academy, Andover, Mass., Dartmouth College, and the University of Virginia School of Law. He is a member of the bar in the District of Columbia and Virginia and served for 3 years as an officer in the United States Navy. During the Carter Administration he was in the office of Counsel to the President, resigning as Deputy Counsel to the President in the White House on January 20. His father is in private law practice in Washington and a former professor of law at Cornell University, Ithaca, N.Y. and other law schools. Mr. Cardozo is a cousin of the late Associate Justice Benjamin Nathan Cardozo of the United States Supreme Court.