Boscobel is a city in Grant County, Wisconsin, United States. The population was 3,286 at the 2020 census. Approximately 0.6 mi. (1 km) to the north of the city, across a riparian swamp, is the Wisconsin River. U.S. Route 61 crosses the Wisconsin River at Boscobel. To the south, the city is bordered by the Town of Boscobel.

Grant County is the most southwestern county in the U.S. state of Wisconsin. As of the 2020 census, the population was 51,938. Its county seat is Lancaster and its largest city is Platteville. The county is named after the Grant River, in turn named after a fur trader who lived in the area when Wisconsin was a territory. Grant County comprises the Platteville Micropolitan Statistical Area. It is in the tri-state area of Wisconsin, Illinois, and Iowa, and is crossed by travelers commuting to Madison, Wisconsin, from a number of eastern Iowan cities, and by residents of northern Illinois traveling to the Twin Cities or La Crosse, Wisconsin.