Elizabeth Scull "Biffy" Sanders, 91, a director of organizations that included the Alexandria Y, the Washington Speakers Group and the Spanish-Portuguese Study Group, died Jan. 8 at Goodwin House West in Falls Church. She had a heart ailment and had suffered a stroke.

Mrs. Sanders, a former editor, was also founder of the writers group of the Foreign Service Officers Wives organization. She had accompanied her husband to posts in Uruguay and Chile.

Mrs. Sanders was a native of Pittsburgh and a graduate of Goucher College. She worked in Washington during the 1930s for organizations that included the President's Conference on Home Building, where she was general manager, the American Association of University Woman, the Civil Service Commission, the Federal Emergency Relief Administration, the Works Progress Administration, the National Youth Administration and the American Public Welfare Association.

She was a member of Delta Gamma social sorority, St. John's Episcopal Church in Georgetown and the Washington and Belle Haven country clubs. She was a volunteer with the Columbia Lighthouse for the Blind.

Her husband, William Barlow Sanders, died in 1976.

Survivors include two children, Kerrie Sanders McHugh of Alexandria and Jon Scully Sanders of Bethesda; a brother; six grandchildren; and eight great-grandchildren.