The Palmer–Northrup House is an historic house at 7919 Post Road in North Kingstown, Rhode Island. It is a 2+1⁄2-story wood-frame structure, and is one of a small number of surviving stone ender houses in the state. Its architecture suggests it was built in the 17th century, either around the time of King Philip's War (1675–78) or possibly even earlier. The oldest portion of the house, including its massive fieldstone chimney, are relatively intact despite later additions around 1740 that significantly enlarged the house. The house stands across the street from Smith's Castle, a house of similar vintage which was built on the site of a trading post established by Roger Williams in 1637.