Claremont City Hall, also known as the Claremont Opera House, is located at 58 Opera House Square in the heart of Claremont, New Hampshire, United States. The monumental Renaissance Revival two-story brick and brownstone building was designed by New York City architect Charles A. Rich and built between 1895 and 1897. As originally designed, its first floor housed a meeting space seating 700, while the upper floor housed the "opera house" (auditorium), which seated nearly 1,000, with a stage adequate for mounting theatrical productions. The opera house was for many years a leading venue for traveling productions. The first floor space was in 1960 partitioned to house additional city offices, and the opera house was shuttered in 1963. A restoration committee formed in the 1970s spearheaded the opera house's restoration and modernization, and it was reopened in 1979.