Dr. George C. Decker, 81, a retired official of the old Office of Education, died of peritonitis Sunday at Prince William Memorial Hospital in Manassas.

Dr. Decker came to Washington and began his career with the Office of Education in 1946. During the 1950s, he served for a short time as a civilian education adviser for the Army in Japan. He then returned here and was an official in the college loan programs with the Education Office.

From 1963 to 1966, he was a program evaluator. For four years before his retirement in 1970, he was a property utilizations officer with the agency.

Dr. Decker received the Office of Education's Outstanding Service Certificate in 1970.

A resident of Arlington during the years of his government service, Dr. Decker also operated the Cedar Dale Farm in Nokesville, Va., where he had bred Charolais beef cattle for many years. He moved to his farm in 1970 and retired as a cattle breeder in 1972.

He was a member of the Virginia and American International Charolais Association.

Dr. Decker was a native of Wisconsin.He earned a bachelor's degree at Stout University and a doctorate in philosophy at Ohio State University. He served in the Navy during World War II.

Survivors include his wife Gladys, of Cedar Dale Farm.