The Pratt Historic Building at 106 South Main Street in Cohasset, Massachusetts, was built in 1903 with private donations as the Paul Pratt Memorial Library, created for the town’s 7,500-volume collection. Expanded in the 1960s and 1970s, it long served the community as its library. After the library moved in 2003 to Ripley Road, in the former Joseph Osgood Elementary School, the building became the headquarters and main museum of the Cohasset Historical Society. It remains significant in Cohasset’s civic history for connecting the town’s early-20th-century library movement with its present-day preservation of local heritage and was listed on the National Register of Historic Places in 2006.