John Francis Cassidy, 82, a retired brigadier general in the Army who later served as an intelligence official and as deputy governor of the U.S. Soldiers' Home, died of cancer Wednesday at Walter Reed Hospital.

Gen. Cassidy was born in New York City. He graduated from the U.S. Military Academy at West Point in 1920 and was commissioned in the coast artillery. He served in Panama and Hawaii, as well as in the United States, before World War II.

In the war, he took part in Allied landings in Italy and southern France and served as deputy chief of staff of the 5th Army. He was assigned to the office of the chief of transportation in the Pentagon at the time of his retirement in 1954.

After leaving the service, Gen. Cassidy, who established his home in the Washington area in 1946, was appointed by President Eisenhower to assist in the development of an "Open Sky Proposal" for a mutual arms inspection system with the Soviet Union. He later was named executive officer of the President's Board of Consultants on Foreign Intelligence Activities.

From 1959 to 1968, Gen. Cassidy was deputy governor of the Soldiers' Home now the Soldiers' and Airmen's Home.

His military decorations included the Legion of Merit and the Bronze Star Medal. He also was Knight of the Holy Sepulchre and a Knight of St. Gregory, honors conferred by the Catholic Church.

Survivors include his wife, the former Bernice Langtry, of the home in Arlington, and two sons, John F., of Balboa Island, Calif., and James M., of Washington.

The family suggests that expressions of sympathy be in the form of contributions to the Army Distaff Foundation, 6200 Oregon Ave. NW., Washington, D.C. 20015, or to the Holy Trinity Mission, Box 41, Silver Spring, Md.