The Oscar Foss Memorial Library is the public library of Barnstead, New Hampshire. It is located in the center of town at 111 South Barnstead Road, in a single-story Colonial Revival building (listed on the National Register of Historic Places) designed by the William M. Butterfield Company of Manchester and built in 1916-17. The library was a gift of Sarah Foss in memory of her husband Oscar, a prominent local businessman who died in 1913. The building originally also housed town offices, which were moved out in 1979. The building underwent a major expansion in 2000.