The Baptist Society Meeting House is a historic former Baptist meeting house at 3-5 Brattle Street in Arlington, Massachusetts. The three story wood frame structure was built in 1790, and was the first for the Baptist congregation that is now housed in Arlington's First Baptist Church. The Federal-style structure was built, apparently in emulation of older meeting houses in Lexington and Concord. In 1828 the building was sold by the congregation and converted to residential use. Originally on Massachusetts Avenue, it now faces Brattle Street.