Carroll is a town in Coös County, New Hampshire, United States. The population was 820 at the 2020 census. The two largest villages are Twin Mountain and Bretton Woods. Carroll is an important access point for recreational areas in the White Mountains, including many 4,000-footers, the Zealand River area, the Presidential Range, and the Presidential Dry River Wilderness. The town is home to the Mount Washington Hotel at Bretton Woods and to the Highland Center at Crawford Notch, the Appalachian Mountain Club's four-season lodge.

Coös County or Coos County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 31,268, making it the least-populated county in the state. The county seat is Lancaster.