The Newport Opera House is a historic civic building and performing arts venue at 20 Main Street in the heart of downtown Newport, the county seat of Sullivan County, New Hampshire, United States. The 2-1/2 story brick building, with its clock and bell tower, is the most prominent feature of Newport's historic downtown. It was built in 1886 to replace the previous town hall and courthouse which had burned down in 1885, and has long served the region as a performance space. The rebuilt Opera House was noted to have the largest stage north of Boston.