Harriet Barnes Pratt (November 11, 1878 – 1969) was an American philanthropist, collector of Americana, non-profit administrator and horticulturist.

In support of national efforts during World War I, she directed YMCA sponsored servicemen's canteens in the New York metropolitan area.

[4] Mrs. Pratt served on White House advisory committees on furnishings during the presidential terms of Calvin Coolidge through to Harry S.

Mrs. Pratt had conceived and created Gardens on Parade, a 5-acre area described in the Herald Tribune as "...the Most Stupendous, Most Magnificent, Most Gorgeous exhibition of flowers, shrubs and other horticultural beauties ever assembled.

"[10] Pratt sold the idea for the Garden to the Fair officials, solicited involvement of individuals and organizations and did most of the fund raising.

Specialty areas featured unusual grasses, espaliered fruit trees and tropical plants.

She was described in glowing terms when honoured as 'no words of mine can do justice to the many great contributions Mrs Pratt has made to the garden.