William G. Finn, 85, a retired director of the food and agricultural division of the U.S. delegation to NATO and other regional organizations in Europe, died Jan. 3 at the Brooke Grove Convalescent Home in Olney. He had Alzheimer's disease.

Mr. Finn, a resident of Rossmoor Leisure World in Silver Spring since 1977 and a former resident of Chevy Chase, was born in Burlington, Ky. He graduated from the University of Kentucky and earned a master's degree in agricultural economics at Iowa State University.

In 1931, Mr. Finn moved to Washington and joined the Department of Agriculture as director of the division of tobacco, rice, sugar and peanuts in the Agricultural Adjustment Administration. He remained there until 1949, when he went to Paris on loan to the State Department as chief of technical assistance for agriculture of the U.S. delegation to European organizations. He later became director of the food and agricultural division of the delegation and retired from that post in 1961.

Mr. Finn was a member of the Interfaith Chapel at Rossmoor, the American Club of Paris and Kiwanis International.

Survivors include his wife of 58 years, Bernice Finn of Rossmoor; two children, Susan M. Smith of Mondovi, Wis., and Carole F. Fisher of Canton, Conn.; one brother, Aubrey Finn of Burlington, and four grandchildren.