Sandwich is a town in Carroll County, New Hampshire, United States. Its population was 1,466 at the 2020 census. Sandwich includes the villages of Center Sandwich and North Sandwich. Part of the White Mountain National Forest is in the north, and part of Squam Lake is in the southwestern corner of the town. As such, Sandwich lies on the boundary between New Hampshire's Lakes Region and White Mountains Region. The Sandwich Range of the White Mountains lies partially within the town, as does the namesake Sandwich Mountain. The town is home to the Sandwich Fair, a popular agricultural fair that occurs every October.

Carroll County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 50,107, making it the third-least populous county in New Hampshire. Its county seat is Ossipee. The county was created in 1840 and organized at Ossipee from towns removed from Strafford County. It was named in honor of Charles Carroll of Carrollton, who had died in 1832, the last surviving signer of the United States Declaration of Independence.