John Page Marshall, 66, a retired administrative law judge with the Federal Maritime Commission, died of cancer Saturday at his home in Washington.

He had retired last July after 14 years with the commission.

Born in Page, W. Va., Mr. Marshall was the great-great-grandson of United States Chief Justice John Marshall. He was a graduate of George Washington University and National University Law School.

Before obtaining his law degree, Mr. Marshall worked for Stinson Aircraft, Ludington Airlines, Eastern Air Transport and Continental Airways.

He went to work for the Civil Aeronautics Board in the late 1930s. During World War II, he served as an officer in charge of the production of transport aircraft with the Army Air Corps. He was duty in the European Theater.

After the war, Mr. Marshall joined the CIvil Aeronautics Administration, remaining there until he went with the Federal Maritime Commission. He also remained in the Air Force Reserve, retiring as a colonel about 10 years ago.

Mr. Marshall was a former member of the Institute of Aeronautical Sciences, the Society of Automotive Engineers, the National Aviation Club, the Army and Navy Club and the Army Navy Country Club.

He was a member of the vestry of St. Margarets Episcopal Church in Washington.

He is survived by his wife, Jane Marshall, of the home; two daughters, Jo Marshall, of Boston, and Lynn Marshall, of Japan; a sister, May M. Jones, of Washington, and two brothers, Edwin R, of Wilmington Del., and James J., of New York City.

The family suggests that expressions of sympathy may be in the form of contributions to the Department of Medical Oncology at Georgetown University Hospital.