Lois Olson, 77, a retired geographer and editor, died Thursday at her home in Washington.

During World War II, she worked for the Office of Strategic Services in Washington, London and Paris. She entered the Central Intelligence Agency when it was formed in 1947 and served as chief geographic editor until retiring in 1962.

Born in Chicago, Miss Olson was a graduate of the University of Chicago, where she also received a master's degree in geology. She studied at the London School of Economics.

After teaching school for several years in Cleveland, she joined the staff of the American Geographical Society in New York and worked on the Geographical Review. She also was geographic editor of the Social Science Abstracts.

Miss Olson came to Washington in the early 1930s to work for the Argriculture Department's Soil Conservation Service. She did climatological research and was in charge of the historical unit that recorded the experiments and practices of soil conservationists from ancient and medieval times to the present.

She had traveled extensively throughout her professional life and after retirement.

For many years, Miss Olson had done volunteer work for the World Federalists Association.

She was a member and former officer of the Society of Woman Geographers. She also was a member of the Association of American Geographers and former chairman of its Middle Atlantic Division.

She belonged to the American Geographical Society, the English-Speaking Union, the League of Women Voters and the United Nations Association.

Miss Olson was a member off All Souls Unitarian Church.

There are no immediate survivors.

It is suggested that expressions of sympathy may be in the form of contributions to the World Federalists Association.