Mary Cummings Williams, 93, a Northern Virginia resident for more than 40 years before moving to Texas about 1960, died of pneumonia Jan. 27 at a Lubbock, Tex., hospital.

She was a charter member of the Arlington Hospital Association and had belonged to the Arts Club of Washington and the Mary Bartlett chapter of the Daughters of the American Revolution here.

Mrs. Williams was the organist and choir director at St. Mary's Episcopal Church in Arlington for 17 years before moving to Texas.

She was named by the Arlington County Board to a committee that helped select street names for the county during the 1920s.

Mrs. Williams was a native of St. Paul, Minn., where she ran a music studio and taught voice and piano, before moving to Washington in 1917.

She was the widow of Arthur Williams, a Washington fire truck ladder salesman, who died in 1941.

She is survived by a daughter, Mary Kelly, of the home in Lubbock, another daughter, Phoebe Benton, of Merida, Yucatan, Mexico; a son, John C., of Arlington; a brother, Robert E. Cummings, of Annandale; eight grandchildren, and seven great-grand-children.

The family suggeests that expressions of sympathy be in the form of contributions to St. Paul's Episcopal Church in Lubbock.