FREDERICK RICHARD (DICK) CARSON, 74, a retired foreign service officer who also had worked for the United Nations, died July 18 at Georgetown University Hospital. He had dermatomyositis, a vascular disease.

Mr. Carson, who lived in Alexandria, was a native of Charlotte, N.C., and a graduate of Duke University. He moved to this area about 1933 and was a personnel and management technician with the Agriculture Department before serving with the Navy in World War II.

After the war, he joined the United Nations Relief and Rehabilitation Administration in London, and also worked for UNRRA in China before joining the old U.S. Economic Cooperation Administration in Athens in 1948. His later State Department assignments included posts as deputy director of its office of international organizations and first secretary of our embassy in the Philippines. He also served in Morocco and Switzerland and was a Foreign Service inspector.

After retiring from the state department in 1973, he worked as a consultant to several government agencies, including U.S. commissioner general of the 1974 World's Fair in Spokane, Wash. He was a member of DACOR (Diplomatic and Consular Officers, Retired).

His first wife, the former Irene Tollerude, died in 1972. Survivors include his wife, Mary, of Alexandria; two children by his first marriage, John F., of Missoula, Mont., and Patricia Davis of Bisbee, Ariz., and a grandchild.