The New Hampshire House of Representatives is the lower house in the New Hampshire General Court, the bicameral legislature of the state of New Hampshire. The House of Representatives consists of 400 members coming from 203 legislative districts across the state, created from divisions of the state's counties. On average, each legislator represents about 3,300 residents, which is the smallest lower house representative-to-population ratio in the country.

New Hampshire has by far the largest lower house of any American state; the second-largest, the Pennsylvania House of Representatives, has 203 members. The House is the fourth-largest lower house in the English-speaking world (behind the 435-member United States House of Representatives, 543-member Lok Sabha of India, and 650-member House of Commons of the United Kingdom).^[2]

Districts vary in number of seats based on their populations, with the least-populous districts electing only one member and the most populous electing 10, not counting floterial seats. (Rockingham district #13 has ten members (Derry))

Voters are allowed to cast as many votes as there are seats to be filled in the district. For instance, in a two-member district, a voter can vote for up to two candidates, in a ten-seat district, for up to ten candidates. Plurality block voting often results in one party winning all of the seats in the district, as the (cross-sectional) results below for the current representation attest. Like in the districts elected by First-past-the-post voting, proportionality of party represention is not generally produced.

Some municipalities are in multiple districts, including floterial districts, so as to achieve more equal apportionment by population.

Unlike in many state legislatures, there is no single "aisle" to cross per se, as members of both parties sit partially segregated in five sections. The seat section and number is put on the legislator's motor vehicle license plate, which they pay for if they wish to put one on their personal automobiles, or in the case of the chairpersons and party leaders, their title is put on the legislative plate. Seating location is enforced, as seating is pre-assigned. Although the personal preference of the legislator is asked, usually chairmen and those with special needs are given the preferred aisle seats. The sixth section is the Speaker's seat at the head of the hall.

The House of Representatives has met in Representatives Hall of the New Hampshire State House since 1819. Representatives Hall is thus the oldest chamber in the United States still in continuous legislative use.^[3] Large arched windows line the walls. On the rostrum hang portraits of John P. Hale, Abraham Lincoln, George Washington, Franklin Pierce, and Daniel Webster.

The current leadership of the house is as follows:

The current committee leadership in the New Hampshire House of Representatives is listed below.^[28]

The chair is the presiding officer of the committee, responsible for leading hearings, maintaining order, and enforcing committee rules. In the absence of the chair, the vice chair becomes presiding officer for the hearing. The clerk is responsible for all administrative matters for the committee, including attendance, minutes, and recording votes. The ranking member is the chief representative of the minority party on the committee, and is traditionally appointed chair when the majority changes hands. Chairs and vice chairs are appointed by and serve at the pleasure of the speaker, while ranking members are appointed by the speaker on recommendation of the minority leader. The committee clerk is selected by the committee chair. The speaker can unilaterally remove or reassign any committee member, chair, vice chair or clerk.