The 1804 New Hampshire gubernatorial election took place on March 13, 1804. Incumbent Federalist Governor John Taylor Gilman won re-election to an eleventh term, defeating Democratic-Republican candidate, former Governor and U.S. Senator John Langdon in a re-match of the previous year's election.

John Taylor Gilman was a farmer, shipbuilder and statesman from Exeter, New Hampshire. He represented New Hampshire in the Continental Congress in 1782–1783 and was the fifth governor of New Hampshire for 14 years, from 1794 to 1805, and from 1813 to 1816.