The United States Senate election of 1806 and 1807 were elections that had the Democratic-Republican Party increase its overwhelming control of the Senate by one additional Senator. The Federalists went into the elections with such a small share of Senate seats (7 out of 34, or 21%) that even if they had won every election, they would have still remained a minority caucus. As it was, however, they lost one of the two seats they were defending and picked up no gains from their opponents.