Old Stone House Library, also known as the Shipman-Swift House, is a historic library building located at Fort Ann, Washington County, New York. It was built about 1825, as a private dwelling and converted for use as a library in 1922. It is a two-story, five bay, Potsdam sandstone building with a small frame rear ell. The building has Federal and Greek Revival style design elements. The building was purchased and donated to the community by George Owen Knapp (1855-1945). It was added to the National Register of Historic Places in 2012.