The Portsmouth Academy building is a historic academic and civic building at 8 Islington Street in Portsmouth, New Hampshire. Built in 1809, it is one of the finest surviving examples of an early 19th-century academic building in northern New England, and is attributed to James Nutter, one of the finest local builders of the period. In addition to housing the Portsmouth Academy, it later housed the city's public library, and presently houses the Portsmouth Historical Society galleries, gift shop and the Discover Portsmouth Welcome Center. It was listed on the National Register of Historic Places in 1973 as "Portsmouth Public Library".