The 1984 United States Senate election in New Hampshire was held on November 6, 1984.
Senator Gordon Humphrey was re-elected to a second term in office.
Senator Humphrey was unopposed for re-nomination by the Republican Party.
Representative D'Amours was unopposed for the Democratic nomination.
During the campaign, D'Amours accused Humphrey of being "ultraconservative." Humphrey, long considered a target for Senate Democrats, may have been helped by his support of environmental programs, including an increase for Superfund spending.