The Secretary of State of New Hampshire is a constitutional officer in the U.S. state of New Hampshire and serves as the exclusive head of the New Hampshire Department of State. The Secretary is third in line for succession as acting Governor of New Hampshire, following the state's President of the Senate and Speaker of the House. The Secretary oversees all state elections, including certifying the results, and keeps the official records of the state. The Secretary is, by statute, the only person who can authorize use of the State Seal.

The governor of New Hampshire is the head of government of the U.S. state of New Hampshire.