National Mary Washington Memorial Association

National Mary Washington Memorial Association (NMWMA) is a hereditary American woman's organization created in Washington, D.C. in 1889, to support in perpetuity the monument to Mary Ball Washington located at Fredericksburg, Virginia. It is the second chartered historical and patriotic society among women in the United States. The monument is the first in the U.S. by women to honor a woman.

On February 22, 1890, the Association was chartered in the District of Columbia, for 1000 years. This organization, composed almost wholly of women and limited to 600 hereditary life members, received by gift the land that had been deeded to the Fredericksburg association and, with the active cooperation of the Daughters of the American Revolution, secured the money needed and built there a new monument and lodge, the title to which was vested in the President and the Chief Justice of the United States and the governor of Virginia, ex officio, as trustees.

Additional work, such as landscape setting including wall and planting, was done in 1939, by landscape architect, Alden S. Hopkins. Ornamental trees were planted in 1987. More recently, in 2008, paving and planting renovations were accomplished by the landscape architect, William D. Rieley.

The monument was vandalized in July 2025.