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: "There is no such thing as an absolute notion of justice not referring to a definite system of social organization. . . . There is neither right nor wrong outside the social nexus." - Human Action