Joseph DiGiorgio, 57, an officer with the General Accounting Office for nearly 30 years before retiring in November 1979, died Friday at Suburban Hospital. He had amyotrophic lateral sclerosis, also known as Lou Gebrig's disease.

Mr. DiGiorgio was a planning officer in the GAO's international division at the time he retired. He had served in Germany, Panama, and Iran during his years with the GAO and helped conduct security studies of American posts in those countries.

He was a member of the New York State Society of Certified Public Accountants.

Mr. DiGiorgio was a native of New York City and a graduate of Pace College. He also did graduate work at George Washington University.

During World War II he served with the Army in Europe and earned the Distinguished Service Cross.

He and his family had made their home in Gaithersburg for the past 10 years. Prior to that they had lived in Alexandria.

Survivors include his wife, Eileen, two sons, Alfred and Bill, and a daughter, Joanne, all of Gaithersburg, and another daughter, Mary Hofstra of Berryville, Va.

The family suggests that expressions of sympathy be in the form of contributions to the ALS Society of America, PO Box 5951, Sherman Oaks, Calif., 91403.