Frederick Fiske Warren (July 3, 1862 – February 2, 1938) was a successful paper manufacturer, fine arts doyen, United States tennis champion of 1893, and major supporter of Henry George's single tax system which he helped develop in Harvard, Massachusetts, United States, in the 1930s.

Fiske Warren established Georgist single-tax colonies and a social experiment in Andorra to disprove Malthus's population theory.

Born in Waltham, Massachusetts on July 3, 1862,[2][3] Fiske was raised in a mansion on 67 Mount Vernon Street[4] on Beacon Hill in Boston.

[8] The Osgoods were a well-known Beacon Hill family that claimed a direct genealogical line to Anne Hutchinson and John Quincy Adams.

[9] Their country house in Harvard, Massachusetts, was added to the National Register of Historic Places in 1996.