Dr. Ross L. Gauld, 76, former director of the division of preventive medicine at the Walter Reed Army Institute of Research, died of congestive heart failure June 30 at Suburban Hospital.

Dr. Gauld retired from Walter Reed in 1967 after 21 years of service.

Born in Ontario, Canada, Dr. Gauld graduated in medicine from the University fo Toronto in 1924.He received a doctorate in public health from the Johns Hopkins University in 1926. He also taught epidemiology at Johns Hopkins for 10 years.

During World 1. Dr. Gauld served in the Royal Canadian Artillery. In World II he served in the U.S. Army in the Mediterranean theater from 1942 to 1945.

He published many scientific papers and was a former resident of the American Epidermiological Society.

Dr. Gauld lived in Rothesda. In addition to his wife, Maude G., survivors include two sons. Col. John H. of Marletta Ga., and Godfrey R., of Arnold. Md., and three sisters, Agnes May, of Wibreline W. Va., Marion Tayler, of Saskelcheron, Canada, and Janet Fralick of Toronto, Canada, and five grandchildren.

The family suggests that expressions of sympathy be made in the form of contributions to the Bradley Hills Presbyterian Church Program Endowment Fund in memory of Dr. Gauld.