1798 and 1799 United States House of Representatives elections

The 1798 and 1799 United States House of Representatives elections were held during President John Adams term. The earliest in New York in April 1798, and the latest in Tennessee in August 1799, after the official start of the 6th Congress on March 4, 1799, but before the start of the first session of this Congress in Philadelphia on December 2, 1799. It was the last congressional session before the move to the new capital at Washington, D.C.

President Adams, a Federalist elected two years prior in the election of 1796, remained popular during a time of national economic growth, and the Federalists made a modest gain of three seats at the expense of the opposition Democratic-Republicans, the party of Vice President and future President Thomas Jefferson. This resulted in an increased Federalist majority in the House, 60-46 seats.

The Federalist party squandered its popularity by passing a series of controversial new laws in the summer of 1798, including the Naturalization Act of 1798 and the Alien and Sedition Acts. Their passage seriously injured the chances of President Adams and Federalist congressional candidates in the elections of 1800.

The House that met during this Congress would ultimately elect Thomas Jefferson over Aaron Burr in the presidential election of 1800.