Leda R. Judd, 40, a lawyer, consumer advocate and consultant on urban affairs and health care, died of cancer Wednesday at George Washington Unversity Hospital.

Mrs. Judd moved to Washington in 1965. She was a lawyer with the Department of Labor and the U.S. Office of Civil Rights and had been program director for the National Urban Coalition before becoming a consultant in 1975 to the coalition and the Department of Health, Education and Welfare.

As a consultant to HEW, she reported on the development of the hospice movement and the role of hospices in the health care system.

Since 1976, Mrs. Judd had been a consultant to the National League for Nursing.

In 1977, she wrote a handbook on health care planning for consumers for the Blue Cross Association. She also was the author of a number of reports on law and order for the Law Enforcement and Assistance Administration.

A native of Pittsburgh, she graduated from the University of Pittsburgh and earned a law degree from the university of Pennsylvania in 1964.

She was a consumer representative on the Committee on Professional Standards, a member of the health law committee of the American Public Health Association, and an executive committee member of the Washington chapter of the American Jewish Congress.

She also was an honorary member of the National Association of Neighborhood Health Centers.

Survivors include her husband, Stanley B., of the home in Washington; a sister, Louise McConaha, and her stepmother, Rose Rothman, both of Pittsburgh.