Marian L. Cooley, 67, who served with the Office of Strategic Services during World War II and who was an official of the Central Intelligence Agency from 1950 to 1970, died of cancer April 28 at the Scripps Institute in La Jolla, Calif.

Mrs. Cooley received the Medal of Freedom for her World War II work, which included service in Algeria, Italy and Austria.

Following the war, she worked in New York for Gen. William J. Donovan, who had been the head of the OSS, as office manager of the Veterans of the OSS. She then returned to the Washington area and began her CIA career, which included assignments in Germany and Vietnam as well as in Washington.

Mrs. Cooley was born in Omaha. She grew up there and in Seattle. She attended Madeira School in McLean. Smith College and the University of Washington. In 1937, she married John B. Condon of Seattle. They were divorced in 1940.

Mrs. Cooley moved from Rockville to Rancho Bernardo, Calif., in 1972.

Survivors include a sister, Laura G. Cooley, of Annandale, and a brother, Richard M. Cooley, of Princess Anne, Md.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society or to a charity of one's choice.