Robert Blum, 65, a retired government economist, died Wednesday at Alexandria Hospital after a heart attack.

He came to Washington in 1941 and spent two years with the War Production Board before enlisting in the Navy. He saw World War II duty in the Pacific.

Mr. Blum returned to Washington and the government in 1946. He was energy group director of the President's Commission on Materials Policy (the Paley Commission), worked with the National Securties Resources Board, and served with the U.S. Embasy in London before joining the old Atomic Energy Commission in 1957.

He was an electric power economist with the AEC for four years, then joined the Federal Power Commission where he was a public utilities economist until retiring from the government in 1966. Since that time he was an economic consultant to government agencies and private organizations.

Mr. Blum was a native of New York City. He earned both bachelor's and master's degrees at the University of Wisconsin and did post-graduate work in economics at Harvard University.

He was a member of the National Economists Club and the Wisconsin Alumi Club of Washington.

Mr. Blum lived in Silver Spring in the early 1940s, then lived in Northern Virginia before moving the Chevy Chase where he had lived since 1957.

Survivors include his wife, Hallie Low Blum of Chevy Chase; two daughters, Nancy Blum and Bonnie Blum-Correal, both of Mendocino, Calf., and one grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the Wisconsin Alumi Club of Washington, c/o Dr. Al Sumberg, American Association of University Professors, 1 Dupont circle, Washington, D.C., 20036.