Spencer Heath (January 3, 1876, Vienna, Virginia – October 6, 1963, Leesburg, Virginia) was an American engineer, attorney, inventor, manufacturer, horticulturist, poet, philosopher of science and social thinker. A dissenter from the prevailing Georgist views, he pioneered the theory of proprietary governance and community in his book Citadel, Market and Altar. His grandson, Spencer Heath MacCallum, popularized and expounded on his ideas, most notably in his book The Art of Community.