Anson John Giancoli, 54, a retired supervisory accountant with the Export-Import Bank and a Washington resident for 45 years, died Saturday at his home in Washington following a heart attack.

Mr. Giancoli was born in Lucca, Italy. He and his family moved to the United States about 1935 and settled in Washington. Mr. Giancoli was a graduate of McKinley Technical High School.

He served in the Army in 1945 and 1946 and began his civilian career with the government in the late 1940s. He was an accountant at the Defense Department when the Korean conflict broke out in 1950 and he spent the next three years in the Air Force.

He then returned to Defense. While working there, he attended night classes at Southeastern University on a scholarship and studied accounting. He took a degree in accounting at Benjamin Franklin University.

About 1958, Mr. Giancoli joined the Export-Import Bank, an agency of the U.S. government that helps finance the export of American products. He was a supervisory accountant when he retired in 1973 because of a physical disability.

Mr. Giancoli, who lived in Washington, was a substitute teacher of accounting in the adult education program of the Montgomery County public school system. He also was a member of the parish of St. Camillus Catholic Church in Silver Spring and of the American Legion.

Survivors include his wife, Theresa, of Washington; three sons, John of Washington, David of Hyattsville, and Dennis of Adelphi; three daughters, Mary Powell of Hyattsville, and Nancy and Barbara Giancoli, both of Washington; his parents, John and Alaide, also of Washington, and six grandchildren.