Bristol County is a county located in the U.S. state of Rhode Island. As of the 2020 census, the population was 50,793, making it the least populous county in Rhode Island. In terms of land area, it is the third-smallest county in the United States, at only 25 square miles (65 km2). The county was created in 1747 when it was separated from Bristol County, Massachusetts. Bristol County is included in the Providence-Warwick, RI-MA Metropolitan Statistical Area, which in turn constitutes a portion of the greater Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.

Bristol County is a county in the Commonwealth of Massachusetts. As of the 2020 census, the population was 579,200. The shire town is Taunton. Some governmental functions are performed by the Commonwealth of Massachusetts, others by the county, and others by local towns and cities.