The National Society of The Colonial Dames of America (NSCDA) is an organization for women who can trace their ancestry to individuals residing in the American colonies before 1776, who also provided service during that colonial period. Established in 1891, it was formed shortly after a similar group, the Colonial Dames of America (CDA), and was conceived as a federation of state societies, each maintaining a degree of autonomy. This organization emerged in the wake of the United States Centennial of 1876 and a U.S. Constitution Centennial celebration in 1889.

The NSCDA's primary focus has been on historic preservation, the restoration of historical sites, and the interpretation of these locations. Their work in this area began in 1897 when the New York Society undertook the preservation of the Van Cortlandt House. The organization operates through 43 corporate societies and has its national headquarters at Dumbarton House in Washington, D.C. Beyond preservation, the NSCDA supports scholarship programs and engages in patriotic service and educational projects.

The National Society of The Colonial Dames of America was founded in 1891, following closely behind the establishment of the Colonial Dames of America (CDA). The NSCDA was designed as a collective of state societies, granting each unit a measure of self-governance. This organizational model emerged in the period following the U.S. Centennial of 1876 and a significant celebration of the U.S. Constitution in 1889. The society is composed of women who can demonstrate descent from an ancestor who settled in an American Colony prior to 1776 and rendered service during the Colonial Era. The organization comprises 43 local societies.

Since its inception, the NSCDA has been actively involved in the preservation and restoration of historic sites. A notable early project was the preservation of the Van Cortlandt House by its New York Society in 1897. The organization's commitment extends to operating and maintaining numerous historic house museums across the United States. In addition to these preservation efforts, the NSCDA sponsors educational programs, including scholarships, and participates in patriotic service activities. Its national headquarters is located at Dumbarton House in Georgetown, Washington, D.C.