Third Meetinghouse is an historic meeting house and Grange Hall at 1 Fairhaven Road in Mattapoisett, Massachusetts.
The Third meeting house of the Second Parish was built in 1816.The Second Parish of Rochester, which met in the building, was founded around 1736 and met in two prior meeting houses before the Third Meeting House was constructed. After 1870 the meeting house became the Barstow School. The building was added to the National Register of Historic Places in 1976.