Kathryne Mitchell, 91 a former nurse who served in France during World War I and a resident of the Washington area for 40 years, died Friday at her family's farm at Centreville, Va. She had cancer.

Mrs. Mitchell was born in Chicago and graduated from the Illinois Training School for nurses. She was a visiting nurse in Chicago and in northern Michigan from the time she completed her training until the United States entered World War I in 1917.

She enlisted in the Army Nurse Corps and sailed for France in May 1917. Mrs. Mitchell served at hospitals in France until 1919, when she was assigned to U.S. occupation forces in Germany. In June 1919, she became part of an American Red Cross Relief Commission working in Montenegro, a part of Yugoslavia. She returned to the United States in November 1920.

In 1922, she married Laurence Mitchell, a Red Cross official whom she had met while working in Montenegro. They lived in St. Louis until 1940, when Mr. Mitchell was transferred to Red Cross headquarters in Washington. w

The couple lived in Arlington until 1943, when they bought their farm, "Bull Run Ranch," in Centerville. They kept it as a working farm until about 10 years ago.

Mrs. Mitchell was a member of the Manassas Women's Club and of St. Timothy's Church in Centerville.

In addition to her husband, of Centreville, survivors include a son, Philip Mitchell, also of Centreville, and seven grandchildren.