Rosemary Dale Drury, 61, who worked as a cryptanalyst for military intelligence in Arlington during World War II, died of cancer Friday at Northern Virginia Doctors Hospital.

Besides her work with military intelligence, Mrs. Drury had been a secretary for the Federal Bureau of Investigation in Albany, N.Y., during World War II. She was a native of Elka Park, N.Y.

In 1945, she married John B. Drury, now a retired administrative law judge. She and her husband settled in this area in 1955.

After her children were grown she resumed secretarial work and was employed for about 10 years by the Bishop Denis J. O'Connell High School and the New York Life Insurance Co. in Arlington.

She was a member of St. Anthony's Catholic Church in Falls Church. She also was active for many years with local charitable organizations, including the Heart Fund, and was a member of the Lake Barcroft Womans Club and its bowliing team.

Besides her husband, of the home in Falls Church, survivors include a daughter, Marydale, of Springfield; two sons, Navy Lt. Cmdr. John L., of Beeville, Tex., and William R., of Reston; two brothers, Francis I. Dale of Albany, and William J. Dale, of the Bronx, N.Y.; a sister, Agnes Farrell, of Elka Part, and one granddaughter.

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