The Legislative Office Building of the New Hampshire State Legislature is a government office building across North State Street from the New Hampshire State House in Concord, New Hampshire.

It is a large two-story granite structure, built in the Richardsonian Romanesque style, with a Chateauesque hip roof crowned by iron cresting.

The main facade faces east, and is dominated by an arcade of three squat Gothic arches supported by smooth round pillars.

[3] The main portion of the building was built between 1884 and 1889 for the federal government to a design by James Riggs Hill, the United States Treasury Department's Supervising Architect.

[3] The building was afterward acquired by the state and converted for use as legislative offices.