Winifred Jeanne Scott, 58, a longtime employe and official of the Maryland court system who served as chief commissioner of the Maryland District Court in Upper Marlboro since the late 1970s, died of cancer Thursday at Georgetown University Hospital. She lived in Fort Washington Forest.

A native of Sioux City, Iowa, she grew up in Aberdeen, S.D. She served in the Navy during World War II and was stationed at the Washington Navy Yard. She spent the rest of her life in this area.

Mrs. Scott began working as a secretary in the early 1950s. In 1961, she joined the Maryland courts and later held a number of positions in the courts, including justice of the peace in Montgomery County, a position to which she was elected in 1966. She was appointed chief commissioner of the court in Upper Marlboro three years ago.

She was a member and former president of Post No. 5629 of the Women's Auxiliary of the Veterans of Foreign Wars and was active in various civic organizations and the Democratic Party.

Mrs. Scott, who was divorced, is survived by three sons, Dr. Richard L., of Rockville, Michael, of Huntingtown, Md., and Steven, of Norfolk, Va.; one sister, Margaret Darden of Concord, Calif., and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Vincent T. Lombardi Cancer Research Center, Georgetown University Hospital, Washington, D.C., 20007.