Abel Parker Upshur (1790–1844) was an American lawyer, judge, and politician from Virginia.
He was active in Virginia state politics and later served as secretary of the Navy and secretary of state during the Whig administration of President John Tyler.
He was the pseudonymous author of An Exposition of the Virginia Resolutions of 1798, a vigorous defense of state nullification.
Ludwig von Mises: "If one wants to study the reasons for Europes backwardness, it would be necessary to examine the manifold laws and regulations that prevented in Europe the establishment of an equivalent of the American drug store and crippled the evolution of chain stores, department stores, super markets and kindred outfits." - Planning for Freedom