Stonington Opera House, Historic theatre in Stonington, Maine, United States.

Stonington Opera House is a wooden theatre building constructed in 1912 located at the corner of Main Street. The structure features a distinctive hip roof on its southern section that shelters the stage area and backstage facilities.

The building rose in 1912 after a fire destroyed an earlier structure, marking a fresh start for the community's gathering space. It gained recognition on the National Register of Historic Places in 1991.

The building's name comes from the mix of uses it has hosted since 1912: theatrical productions, lectures, town meetings, basketball games and roller skating, with a floor of removable folding chairs so the space could be cleared for dances. Films arrived around 1918 and dominated its use by the mid-20th century. Opera House Arts, the local nonprofit that reopened it in 2000, runs it today.

The main entrance is at the north end of the building, with a secondary door on the east side of the tall south block. The auditorium floor was laid out for removable folding chairs, so seating arrangements vary by event. The building sits on a rock outcrop across Main Street from the main pier, in the center of town.

The theatre preserves its original projection booth from the 1910s, lined with asbestos tile as a safety measure. This construction method was a practical response to the fire hazard posed by the nitrate film stock used in those early projectors.