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: "In relation to the immense sacrifices that the state demands of the individual through the blood tax, it seems rather incidental whether it compensates the soldier more or less abundantly for the loss of time that he suffers from his military-service obligation." - Nation, State, and Economy