Marion Sharda Roberts, 66, a retired personnel official at the National Bureau of Standards who earlier had worked for the Social Security Administration, died of cancer Saturday at Holy Cross Hospital in Silver Spring.

Mrs. Roberts was born in Huron, S.D., and grew up in Southern Illinois, where her father was a traveling Methodist minister. She moved to Washington in 1937 and began her career with the Social Security Administration in the same year. She remained there until 1944. She also attended George Washington University.

In 1957, she joined the National Bureau of Standards as an employe relations officer. She later was an administrative assistant of personnel. At the time of her retirement in 1973, she was an incentive awards officer.

After leaving the government, Mrs. Roberts worked for the evaluation panel of the National Academy of Sciences. She retired a second time earlier this year.

Mrs. Roberts was a member of Christ Congregational Church in Silver Spring and served on its board of deacons.

Her husband, F. Stuart Roberts, whom she married in 1940, died in 1956.

Survivors include a son, Gregory S. of Swampscott, Mass., a daughter, Leslie S. Roberts of Arlington, a sister, Jean W. Sharda of Kansas

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