Jotham Post, Jr. (April 4, 1771 – May 15, 1817) was a U.S. Representative from the state of New York, USA.Born near Westbury, New York, Post was graduated from Columbia College, New York City, in 1792.He studied medicine but did not practice. He engaged in the drug-importing business in New York City.He served as member of the board of aldermen. He served in the State assembly 1795 and 1805–1808.