Elizabeth Stuart Otto, 63, active in Chevy Chase church affairs, died of viral pneumonia Monday at Washington Hospital Center.

She was the wife of Paul H. Otto, chairman of the board of the Washington Stair and Ornament Iron Works.

Born in Cheswich, Pa., Mrs. Otto attended Wilson College in Chambersburg. She came here in 1938 to work as a secretary to then Sen. Prentiss M. Brown (D-Mich.) and remained his secretary when he served in the Office of Price Administration in 1943.

Mrs. Otto was a past president of the Falls Church Chapter E of the PEO, a philanthropic organization. She was a former secretary of the Welcome to Washington International Club.

An active member for many years of the Chevy Chase Presbyterian Church, she belong to the Community Bible Study of the Washington area.

In addition to her husband, of the home in Chevy Chase, she is survived by a son, Paul Louis, of Bethesda; a daughter, Susan Getz, of Huntly, Va.; three sisters, Mrs. Roland G. Ruppenthal, of Bethesda, Lois Stuart, of Staunton, Va., and Mrs. James W. Brown, of McLean; three brothers, Robert E. Stuart, of Fort Washington Forest, Md., Paul A. Stuart Jr., of Midwest City, Okla., and Fred W. Stuart, of Falls Church, and a grandchild.

The family suggests that expressions of sympathy may be in the form of contributions to the Lung Association of Mid-Maryland, Inc. in Rockville.