is a town in Providence County, Rhode Island, United States. It includes the historic villages of Esmond, Georgiaville, Mountaindale, Hanton City and Greenville. The population was 20,613 at the 2000 census.
The town was first settled in the 1600s as a farming community and named after Smithfield, London. There was an active Quaker community in early Smithfield that extended to south Uxbridge, in the early 1700s. In the nineteenth century several mills were built in the town. In the mid-nineteenth century the towns of North Smithfield, Rhode Island, and Lincoln, Rhode Island, became separate towns. In the 1920s the Ku Klux Klan was active in the area, and KKK rallies were held within the town. Also, the colonial ghost town of Hanton City is located within the town.