The 1816 United States general election elected the members of the 15th United States Congress. Mississippi and Illinois were admitted as states during the 15th Congress. The election took place during the First Party System. The Democratic-Republican Party controlled the Presidency and both houses of Congress, with the Federalist Party providing only limited opposition. The election marked the start of the Era of Good Feelings, as the Federalist Party became nearly irrelevant in national politics.
In the Presidential election, Democratic-Republican Secretary of State James Monroe defeated Federalist Senator Rufus King of New York.
In the House, Democratic-Republicans won major gains, and continued to dominate the chamber.
In the Senate, Democratic-Republicans picked up a moderate number of seats, increasing their already-dominant majority.