Louise Evelina du Pont Crowninshield (August 3, 1877 – July 11, 1958) was an American heiress, historic preservationist, and philanthropist.

A socialite who mingled in elite society in New York and Washington, DC, Louise du Pont married Boston Brahmin and professional yachtsman Francis Boardman Crowninshield on June 28, 1900.

The couple split their time between Marblehead, Massachusetts; Boca Grande, Florida; and Eleutherian Mills near Wilmington, Delaware.

She was a co-founder of the National Trust for Historic Preservation in 1949 and served as vice chair of the board in 1953.

[4] She was buried at Du Pont de Nemours Cemetery in New Castle County, Delaware.