Jefferson Dix Jr., 72, a retired foreign service officer who was an administrator with the University of Virginia's School of Continuing Studies from 1966 to 1974, died Saturday at Fairfax Hospital. He had an aortic aneurysm.

He joined the government in 1933 and worked for the old Works Progress Administration and the Commerce Department before joining the State Department 10 years later.

Mr. Dix served as a budget and fiscal officer at embassies in Asia, Austria, and Canada. He was first secretary at the U.S. Embassy in Lima, Peru, at the time he retired from the Foreign Service in 1962.

He was awarded a medal by the Austrian government in 1951. Four years later, while stationed in Ottawa, Canada, he was a founder and the first president of the Little League baseball organization in that city.

Mr. Dix was born in Pennsylvania and reared in College Park, Md., where he later attended the University of Maryland and was a member of the football team. He earned a law degree at Columbus Law School, now a part of Catholic University.

He is survived by his wife, Anna L., of the home in Springfield, Va.; two daughters, Diane D. Massa of Charlottesville, and Patricia D. Sliwka of Utica, N.Y.; a son, Jefferson III, of Arlington; two sisters, Helene E. Dix of Springfield and Dorothy D. Steiger of Seattle, and two grandchildren.