Frederic R. Fisher, 76, a retired economist with the Agency for International Development, died of cancer Tuesday at his home in McLean.

He was considered an authority on Latin American economics, serving for 15 years in the 1950s and 60s in Paraguay, Guatemala and British Honduras for AID and its predecessor, the Economic Cooperation Administration.

Mr. Fisher joined ECA in 1948 and for three years was in the trade payments division at its Paris headquarters.

His last assignment before returning in 1968 was with the Vietnam bureau of AID in Washington. Immediately before that, he had been on assignment in Saigon.

Mr. Fisher was born in Manila, the Philippines, where his father was an attorney and judge. He moved to California as a boy. After graduating from Stanford University he earned a master's degree from the Harvard School of Business Administration in 1925, and worked in private industry in San Francisco for 13 years.

Mr. Fisher then returned to Manila to work for an export-import company. At the outbreak of World War II, he and his wife, the former Ruth Lincoln, were captured by the Japanese and spent more than three years in prison camps in Santo Thomas and Los Banos.

After the war he went to Liberia, where he was an auditor for that country's government until joining ECA.

Mr. Fisher's wife died in 1976.

He is survived by a sister, Rosalind McCrea, of Villanova, Pa.

The family suggests that expressions of sympathy be in the form of contributions in memory of Ruth Lincoln Fisher to the American Cancer Society.