Collis Stocking, 78, a retired senior economist and adminstrative officer with the President's Council of Economic Advisors, died Saturday at Fairfax Hospital. He had been suffering from Parkingson's disease.

Mr. Stocking was an economist by training and his first interest in that discipline was labor and employment problems, but in the course of a government career that spanned 27 years he worked on all phases of economic policy.

He was born in Claendon, Tex. He attended Claendon College there and also the universities of Kansas and Pittsburg. He did further work at the Dijon, France, and the Sorbonne in Paris. He earned a master's degree at Columbia University.

He joined the federal government in 1934 after teaching at the University of Vermont and New York University. His first job in Washington was as a special investigator with the National Recovery Administration. A year later, he was assistant chief of the division of foreign trade in the Commerce Department in 1936, he became chief of research and statistics and assistant director of the bureau of employment security at the old Social Security Board.

During World War II, he was assistant director of the War Manpower Commission. He later worked for the National Security Resources Board and Defense Products Administration.

He joined the Council of Economic Advisors in 1951 and served under Presidents Truman, Eisenhower and Kennedy before his retirement in 1961.

For the next four years, he was a special economic adviser to the governments of South Korea and India while working for the Ford Foundation.

Mr. Stock was a member of the American Economics Association. His late brother, George Ward Stocking, had been president of that organization.

He also was a member of the Cosmos Club.

His survivors include his wife, the former Claudia Edith Roberts, whom he married in 1929, of Arlington; two daughters, Collis Suzanne, also of Arlington, and Diane Callam, of Ormond Beach, Fla.; a sister, Mary McConnell, of Amarillo, Texas; a brother, Hobart E., of Stillwater, Okla., and one granddaughter.